{
 "aliases": [
  {
   "relation": "exact",
   "review_state": "source",
   "source_entity_id": "6076",
   "source_ref": "pudl-plants"
  },
  {
   "kind": "alias",
   "note": "co-owner name for the plant",
   "relation": "exact",
   "review_state": "reviewed",
   "reviewed_on": "2026-09-18",
   "source_entity_id": "Colstrip Plant",
   "source_ref": "curated-aliases",
   "source_url": "https://www.northwesternenergy.com/clean-energy/where-does-your-energy-come-from/electric-generation/colstrip-power-plant"
  },
  {
   "kind": "display_name",
   "note": "operator name for the plant",
   "relation": "exact",
   "review_state": "reviewed",
   "reviewed_on": "2026-09-18",
   "source_entity_id": "Colstrip Steam Electric Station",
   "source_ref": "curated-aliases",
   "source_url": "https://www.talenenergy.com/plant/colstrip-steam-electric-station/"
  }
 ],
 "citation_path": "citations/plant~eia~6076.html",
 "context": {
  "nearby_bpa_lines": [],
  "nearby_bpa_lines_status": {
   "available": true,
   "method": "Planar distance in the CONUS Albers projection (EPSG:5070) from the reported plant point to the published geometry, within about 1% in the region; features within 3 km, nearest first. Context only: nearness is not an electrical connection.",
   "note": "nearby_lines holds BPA's published lines and HIFLD-compiled lines of other owners (source_ref on each row); nearby_bpa_lines is the BPA subset; substations are HIFLD 2022 points at 100 kV and above",
   "radius_km": 3.0,
   "reason": null
  },
  "nearby_lines": [
   {
    "distance_km": 0.14,
    "id": "line:hifld:202873",
    "name": "TONGUE RIVER ELECTRIC COOP INC line 202873",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 138.0
   },
   {
    "distance_km": 0.14,
    "id": "line:hifld:202874",
    "name": "TONGUE RIVER ELECTRIC COOP INC line 202874",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 138.0
   },
   {
    "distance_km": 0.14,
    "id": "line:hifld:202875",
    "name": "TONGUE RIVER ELECTRIC COOP INC line 202875",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 138.0
   },
   {
    "distance_km": 0.14,
    "id": "line:hifld:202876",
    "name": "TONGUE RIVER ELECTRIC COOP INC line 202876",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 138.0
   },
   {
    "distance_km": 0.2,
    "id": "line:hifld:202872",
    "name": "TONGUE RIVER ELECTRIC COOP INC line 202872",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 138.0
   },
   {
    "distance_km": 0.21,
    "id": "line:hifld:202871",
    "name": "TONGUE RIVER ELECTRIC COOP INC line 202871",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 138.0
   },
   {
    "distance_km": 0.43,
    "id": "line:hifld:204493",
    "name": "TONGUE RIVER ELECTRIC COOP INC line 204493",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 115.0
   },
   {
    "distance_km": 0.44,
    "id": "line:hifld:204494",
    "name": "TAP205565 – COLSTRIP",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 115.0
   },
   {
    "distance_km": 0.45,
    "id": "line:hifld:204495",
    "name": "MID-YELLOWSTONE ELEC COOP INC line 204495",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "115-161",
    "voltage_kv": 115.0
   },
   {
    "distance_km": 0.89,
    "id": "line:hifld:201403",
    "name": "HARDEN – COLSTRIP",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "230",
    "voltage_kv": 230.0
   },
   {
    "distance_km": 0.9,
    "id": "line:hifld:200112",
    "name": "BROADVIEW – COLSTRIP",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "500",
    "voltage_kv": 500.0
   },
   {
    "distance_km": 0.9,
    "id": "line:hifld:200113",
    "name": "BROADVIEW – COLSTRIP",
    "source_ref": "hifld-lines-2021",
    "type": "line",
    "voltage_class": "500",
    "voltage_kv": 500.0
   }
  ],
  "nearby_substations": [
   {
    "distance_km": 0.14,
    "id": "substation:hifld:204538",
    "kind": "SUBSTATION",
    "max_kv": 138.0,
    "name": "Unnamed substation",
    "source_ref": "hifld-substations-2022",
    "type": "substation"
   },
   {
    "distance_km": 0.21,
    "id": "substation:hifld:204537",
    "kind": "SUBSTATION",
    "max_kv": 138.0,
    "name": "Unnamed substation",
    "source_ref": "hifld-substations-2022",
    "type": "substation"
   },
   {
    "distance_km": 0.9,
    "id": "substation:hifld:201278",
    "kind": "SUBSTATION",
    "max_kv": 500.0,
    "name": "COLSTRIP",
    "source_ref": "hifld-substations-2022",
    "type": "substation"
   }
  ],
  "territories": [
   {
    "id": "territory:mtcoop:14",
    "name": "Tongue River Electric CO-OP",
    "note": "Plant coordinate lies inside this approximate territory polygon; candidate only, not a supply or service relationship",
    "relation": "candidate",
    "source_ref": "mt-coop-territories"
   }
  ]
 },
 "coverage": {
  "generators_eligible": 4,
  "generators_operating": 2,
  "generators_published": 4,
  "output_years": [
   2015,
   2016,
   2017,
   2018,
   2019,
   2020,
   2021,
   2022,
   2023,
   2024
  ],
  "ownership_known_generators": 4
 },
 "disclosed_claims": {
  "note": "Washington Fuel Mix Disclosure claims on this plant for CY2024, the latest year loaded; several suppliers can claim one plant; a claim attributes retail sales, it is not a wire or a share of ownership",
  "report_year": 2024,
  "rows": [
   {
    "category": "Coal",
    "claim_type": "Utility Specified",
    "claimant_id": 90,
    "claimant_name": "Puget Sound Energy",
    "mwh": 1483438.0,
    "org": {
     "id": "org:eia:15500",
     "name": "Puget Sound Energy"
    },
    "rec": null,
    "report_year": 2024
   },
   {
    "category": "Coal",
    "claim_type": "Utility Specified",
    "claimant_id": 109,
    "claimant_name": "Avista (WA)",
    "mwh": 716617.0,
    "org": {
     "id": "org:eia:20169",
     "name": "Avista"
    },
    "rec": null,
    "report_year": 2024
   },
   {
    "category": "Coal",
    "claim_type": "Utility Specified",
    "claimant_id": 130,
    "claimant_name": "PacifiCorp",
    "mwh": 92915.0,
    "org": {
     "id": "org:eia:14354",
     "name": "PacifiCorp"
    },
    "rec": null,
    "report_year": 2024
   },
   {
    "category": "Petroleum",
    "claim_type": "Utility Specified",
    "claimant_id": 90,
    "claimant_name": "Puget Sound Energy",
    "mwh": 1855.0,
    "org": {
     "id": "org:eia:15500",
     "name": "Puget Sound Energy"
    },
    "rec": null,
    "report_year": 2024
   },
   {
    "category": "Petroleum",
    "claim_type": "Utility Specified",
    "claimant_id": 109,
    "claimant_name": "Avista (WA)",
    "mwh": 896.0,
    "org": {
     "id": "org:eia:20169",
     "name": "Avista"
    },
    "rec": null,
    "report_year": 2024
   },
   {
    "category": "Petroleum",
    "claim_type": "Utility Specified",
    "claimant_id": 130,
    "claimant_name": "PacifiCorp",
    "mwh": 116.0,
    "org": {
     "id": "org:eia:14354",
     "name": "PacifiCorp"
    },
    "rec": null,
    "report_year": 2024
   },
   {
    "category": "Petroleum",
    "claim_type": "Utility Specified",
    "claimant_id": 90,
    "claimant_name": "Puget Sound Energy",
    "mwh": 0.0,
    "org": {
     "id": "org:eia:15500",
     "name": "Puget Sound Energy"
    },
    "rec": null,
    "report_year": 2024
   },
   {
    "category": "Petroleum",
    "claim_type": "Utility Specified",
    "claimant_id": 109,
    "claimant_name": "Avista (WA)",
    "mwh": 0.0,
    "org": {
     "id": "org:eia:20169",
     "name": "Avista"
    },
    "rec": null,
    "report_year": 2024
   },
   {
    "category": "Petroleum",
    "claim_type": "Utility Specified",
    "claimant_id": 130,
    "claimant_name": "PacifiCorp",
    "mwh": 0.0,
    "org": {
     "id": "org:eia:14354",
     "name": "PacifiCorp"
    },
    "rec": null,
    "report_year": 2024
   }
  ],
  "source_ref": "wa-fmd-2024-by-plant"
 },
 "emissions": {
  "all_units_monitored": true,
  "available": true,
  "combustion_mw": 1647.4,
  "combustion_mw_monitored": 1647.4,
  "conversion": {
   "short_tons_to_tonnes": 0.90718474
  },
  "crosswalk_source_ref": "pudl-epa-eia-crosswalk",
  "crosswalk_year": 2024,
  "evidence": "estimated",
  "evidence_rule": "metered where at least 99% of the plant's operating unit-hours carry EPA's Measured flag, estimated where more were Substitute, Measured and Substitute or another method code",
  "facts": [
   {
    "basis": "Sum of hourly CO2 mass reported under 40 CFR Part 75 by the plant's EPA-monitored units over the reporting year, short tons x 0.90718474. Stack total of those units including any share attributable to steam sold; the plant's total only where every combustion generator is monitored",
    "coverage": {
     "eligible": 2,
     "included": 2,
     "unit": "combustion generators"
    },
    "denominator": null,
    "evidence": "estimated",
    "fact_id": "plant:eia:6076#co2_mass_tonnes@2024",
    "label": "CO2 mass, monitored units",
    "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "co2_mass_tonnes",
    "missing_reason": null,
    "note": "98.4% of operating unit-hours were flagged Measured; the rest follow Part 75 missing-data procedures, which are designed to err high",
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 0,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "t CO2",
    "value": 9099949.625472048
   },
   {
    "basis": "The same sum in the unit EPA's files use (short tons); shown beside the metric figure so the conversion is visible",
    "coverage": {
     "eligible": 2,
     "included": 2,
     "unit": "combustion generators"
    },
    "denominator": null,
    "evidence": "estimated",
    "fact_id": "plant:eia:6076#co2_mass_short_tons@2024",
    "label": "CO2 mass, monitored units, as filed",
    "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "co2_mass_short_tons",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 0,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "short tons CO2",
    "value": 10030977.400999986
   },
   {
    "basis": "Sum over the year of each monitored unit's reported hourly gross load (MW) x operating time (h). A unit-reported quantity: a combined-cycle unit need not include its steam turbine, so this can be below EIA net generation",
    "coverage": null,
    "denominator": null,
    "evidence": "estimated",
    "fact_id": "plant:eia:6076#cems_gross_load_mwh@2024",
    "label": "Gross load of monitored units",
    "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "cems_gross_load_mwh",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 0,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "MWh",
    "value": 9961334.84
   },
   {
    "basis": "Sum over the year of each monitored unit's reported hourly heat input",
    "coverage": null,
    "denominator": null,
    "evidence": "estimated",
    "fact_id": "plant:eia:6076#cems_heat_input_mmbtu@2024",
    "label": "Heat input of monitored units",
    "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "cems_heat_input_mmbtu",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 0,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "mmBtu",
    "value": 95681309.87899989
   },
   {
    "basis": "Sum of reported operating time over the plant's monitored units: unit-hours, so it can exceed the hours in the year when several units ran",
    "coverage": {
     "eligible": 2,
     "included": 2,
     "unit": "monitored units"
    },
    "denominator": null,
    "evidence": "metered",
    "fact_id": "plant:eia:6076#cems_unit_operating_hours@2024",
    "label": "Unit operating hours, monitored units",
    "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "cems_unit_operating_hours",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 1,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "h",
    "value": 14298.75
   },
   {
    "basis": "Calendar hours of the reporting year in which at least one monitored unit reported operating time; never above the hours in the year",
    "coverage": null,
    "denominator": null,
    "evidence": "metered",
    "fact_id": "plant:eia:6076#cems_hours_with_operation@2024",
    "label": "Hours in which a monitored unit ran",
    "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "cems_hours_with_operation",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 0,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "count",
    "value": 8306.0
   },
   {
    "basis": "Distinct EPA emissions units at the plant with rows in the reporting year; an EPA unit is a combustor or stack, not an EIA generator",
    "coverage": null,
    "denominator": null,
    "evidence": "reported",
    "fact_id": "plant:eia:6076#cems_units_monitored@2024",
    "label": "EPA emissions units with CEMS rows",
    "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "cems_units_monitored",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 0,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "count",
    "value": 2.0
   },
   {
    "basis": "Existing coal, gas, oil or waste generators of the plant (EIA-860 inventory year) that the EPA-EIA crosswalk links to a unit with CEMS rows; a steam turbine linked to several combustion turbines counts once",
    "coverage": null,
    "denominator": null,
    "evidence": "reported",
    "fact_id": "plant:eia:6076#cems_generators_monitored@2024",
    "label": "Combustion generators linked to a monitored unit",
    "locator": "core_epa__assn_eia_epacamd.parquet; report_year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "cems_generators_monitored",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 0,
    "quality": "valid",
    "source_ref": "pudl-epa-eia-crosswalk",
    "unit": "count",
    "value": 2.0
   },
   {
    "basis": "Existing (operating, standby or out of service) generators whose resource group is coal, gas, oil or waste in the EIA-860 inventory year: the units that could be monitored",
    "coverage": null,
    "denominator": null,
    "evidence": "reported",
    "fact_id": "plant:eia:6076#cems_generators_total@2024",
    "label": "Combustion generators at the plant",
    "locator": "out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "cems_generators_total",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 0,
    "quality": "valid",
    "source_ref": "pudl-generators",
    "unit": "count",
    "value": 2.0
   },
   {
    "basis": "Operating unit-hours EPA flagged Measured divided by all operating unit-hours of the plant's monitored units; the rest were Substitute, Measured and Substitute, or another method code",
    "coverage": {
     "eligible": 14325,
     "included": 14097,
     "unit": "operating unit-hours"
    },
    "denominator": null,
    "evidence": "metered",
    "fact_id": "plant:eia:6076#cems_measured_share@2024",
    "label": "Share of operating unit-hours with measured CO2",
    "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=6076",
    "maturity": "final",
    "method": "derived",
    "metric": "cems_measured_share",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 4,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "fraction",
    "value": 0.9840837696335079
   },
   {
    "basis": "Monitored-unit CO2 (tonnes) divided by the plant's EIA-923 net generation for the same year. Only where every combustion generator is monitored, so numerator and denominator cover the same plant; comparable across such plants",
    "coverage": null,
    "denominator": {
     "basis": "EIA-923 net generation of the whole plant, same calendar year",
     "metric": "net_generation_mwh",
     "unit": "MWh",
     "value": 9028456.999
    },
    "evidence": "estimated",
    "fact_id": "plant:eia:6076#co2_intensity_net_t_per_mwh@2024",
    "label": "CO2 per MWh of net generation",
    "locator": "derived: co2_mass_tonnes@2024 / net_generation_mwh@2024 (pudl-output)",
    "maturity": "final",
    "method": "derived",
    "metric": "co2_intensity_net_t_per_mwh",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 3,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "t CO2/MWh",
    "value": 1.0079185874707015
   },
   {
    "basis": "Monitored-unit CO2 (tonnes) divided by the same units' reported gross load. Only where every combustion generator is monitored and the gross load is not below EIA net generation; gross, so lower than the net figure, and not comparable with it",
    "coverage": null,
    "denominator": {
     "basis": "gross load the monitored units themselves reported; a combined-cycle unit need not include its steam turbine",
     "metric": "cems_gross_load_mwh",
     "unit": "MWh",
     "value": 9961334.84
    },
    "evidence": "estimated",
    "fact_id": "plant:eia:6076#co2_intensity_gross_t_per_mwh@2024",
    "label": "CO2 per MWh of gross load (unit-reported)",
    "locator": "derived: co2_mass_tonnes@2024 / cems_gross_load_mwh@2024",
    "maturity": "final",
    "method": "derived",
    "metric": "co2_intensity_gross_t_per_mwh",
    "missing_reason": null,
    "note": null,
    "period": {
     "hours": 8784,
     "kind": "calendar_year",
     "period_end": "2025-01-01T00:00:00Z",
     "period_start": "2024-01-01T00:00:00Z",
     "year": 2024
    },
    "precision": 3,
    "quality": "valid",
    "source_ref": "pudl-epacems",
    "unit": "t CO2/MWh",
    "value": 0.9135271298110533
   }
  ],
  "generators_monitored": 2,
  "generators_monitored_other": 0,
  "generators_total": 2,
  "generators_unmonitored": null,
  "history": [
   {
    "all_units_monitored": true,
    "available": true,
    "combustion_mw": 1647.4,
    "combustion_mw_monitored": 1647.4,
    "conversion": {
     "short_tons_to_tonnes": 0.90718474
    },
    "crosswalk_source_ref": "pudl-epa-eia-crosswalk",
    "crosswalk_year": 2023,
    "evidence": "estimated",
    "evidence_rule": "metered where at least 99% of the plant's operating unit-hours carry EPA's Measured flag, estimated where more were Substitute, Measured and Substitute or another method code",
    "facts": [
     {
      "basis": "Sum of hourly CO2 mass reported under 40 CFR Part 75 by the plant's EPA-monitored units over the reporting year, short tons x 0.90718474. Stack total of those units including any share attributable to steam sold; the plant's total only where every combustion generator is monitored",
      "coverage": {
       "eligible": 2,
       "included": 2,
       "unit": "combustion generators"
      },
      "denominator": null,
      "evidence": "estimated",
      "fact_id": "plant:eia:6076#co2_mass_tonnes@2023",
      "label": "CO2 mass, monitored units",
      "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "co2_mass_tonnes",
      "missing_reason": null,
      "note": "98.6% of operating unit-hours were flagged Measured; the rest follow Part 75 missing-data procedures, which are designed to err high",
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 0,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "t CO2",
      "value": 10879333.072381603
     },
     {
      "basis": "The same sum in the unit EPA's files use (short tons); shown beside the metric figure so the conversion is visible",
      "coverage": {
       "eligible": 2,
       "included": 2,
       "unit": "combustion generators"
      },
      "denominator": null,
      "evidence": "estimated",
      "fact_id": "plant:eia:6076#co2_mass_short_tons@2023",
      "label": "CO2 mass, monitored units, as filed",
      "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "co2_mass_short_tons",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 0,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "short tons CO2",
      "value": 11992411.901000012
     },
     {
      "basis": "Sum over the year of each monitored unit's reported hourly gross load (MW) x operating time (h). A unit-reported quantity: a combined-cycle unit need not include its steam turbine, so this can be below EIA net generation",
      "coverage": null,
      "denominator": null,
      "evidence": "estimated",
      "fact_id": "plant:eia:6076#cems_gross_load_mwh@2023",
      "label": "Gross load of monitored units",
      "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "cems_gross_load_mwh",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 0,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "MWh",
      "value": 11912528.99
     },
     {
      "basis": "Sum over the year of each monitored unit's reported hourly heat input",
      "coverage": null,
      "denominator": null,
      "evidence": "estimated",
      "fact_id": "plant:eia:6076#cems_heat_input_mmbtu@2023",
      "label": "Heat input of monitored units",
      "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "cems_heat_input_mmbtu",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 0,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "mmBtu",
      "value": 114374125.74299976
     },
     {
      "basis": "Sum of reported operating time over the plant's monitored units: unit-hours, so it can exceed the hours in the year when several units ran",
      "coverage": {
       "eligible": 2,
       "included": 2,
       "unit": "monitored units"
      },
      "denominator": null,
      "evidence": "metered",
      "fact_id": "plant:eia:6076#cems_unit_operating_hours@2023",
      "label": "Unit operating hours, monitored units",
      "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "cems_unit_operating_hours",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 1,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "h",
      "value": 16235.31
     },
     {
      "basis": "Calendar hours of the reporting year in which at least one monitored unit reported operating time; never above the hours in the year",
      "coverage": null,
      "denominator": null,
      "evidence": "metered",
      "fact_id": "plant:eia:6076#cems_hours_with_operation@2023",
      "label": "Hours in which a monitored unit ran",
      "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "cems_hours_with_operation",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 0,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "count",
      "value": 8760.0
     },
     {
      "basis": "Distinct EPA emissions units at the plant with rows in the reporting year; an EPA unit is a combustor or stack, not an EIA generator",
      "coverage": null,
      "denominator": null,
      "evidence": "reported",
      "fact_id": "plant:eia:6076#cems_units_monitored@2023",
      "label": "EPA emissions units with CEMS rows",
      "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "cems_units_monitored",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 0,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "count",
      "value": 2.0
     },
     {
      "basis": "Existing coal, gas, oil or waste generators of the plant (EIA-860 inventory year) that the EPA-EIA crosswalk links to a unit with CEMS rows; a steam turbine linked to several combustion turbines counts once",
      "coverage": null,
      "denominator": null,
      "evidence": "reported",
      "fact_id": "plant:eia:6076#cems_generators_monitored@2023",
      "label": "Combustion generators linked to a monitored unit",
      "locator": "core_epa__assn_eia_epacamd.parquet; report_year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "cems_generators_monitored",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 0,
      "quality": "valid",
      "source_ref": "pudl-epa-eia-crosswalk",
      "unit": "count",
      "value": 2.0
     },
     {
      "basis": "Existing (operating, standby or out of service) generators whose resource group is coal, gas, oil or waste in the EIA-860 inventory year: the units that could be monitored",
      "coverage": null,
      "denominator": null,
      "evidence": "reported",
      "fact_id": "plant:eia:6076#cems_generators_total@2023",
      "label": "Combustion generators at the plant",
      "locator": "out_eia__yearly_generators.parquet; report_date=2023-01-01; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "cems_generators_total",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 0,
      "quality": "valid",
      "source_ref": "pudl-generators",
      "unit": "count",
      "value": 2.0
     },
     {
      "basis": "Operating unit-hours EPA flagged Measured divided by all operating unit-hours of the plant's monitored units; the rest were Substitute, Measured and Substitute, or another method code",
      "coverage": {
       "eligible": 16259,
       "included": 16025,
       "unit": "operating unit-hours"
      },
      "denominator": null,
      "evidence": "metered",
      "fact_id": "plant:eia:6076#cems_measured_share@2023",
      "label": "Share of operating unit-hours with measured CO2",
      "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=6076",
      "maturity": "final",
      "method": "derived",
      "metric": "cems_measured_share",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 4,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "fraction",
      "value": 0.9856079709699244
     },
     {
      "basis": "Monitored-unit CO2 (tonnes) divided by the plant's EIA-923 net generation for the same year. Only where every combustion generator is monitored, so numerator and denominator cover the same plant; comparable across such plants",
      "coverage": null,
      "denominator": {
       "basis": "EIA-923 net generation of the whole plant, same calendar year",
       "metric": "net_generation_mwh",
       "unit": "MWh",
       "value": 10820444.012
      },
      "evidence": "estimated",
      "fact_id": "plant:eia:6076#co2_intensity_net_t_per_mwh@2023",
      "label": "CO2 per MWh of net generation",
      "locator": "derived: co2_mass_tonnes@2023 / net_generation_mwh@2023 (pudl-output)",
      "maturity": "final",
      "method": "derived",
      "metric": "co2_intensity_net_t_per_mwh",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 3,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "t CO2/MWh",
      "value": 1.0054423885301096
     },
     {
      "basis": "Monitored-unit CO2 (tonnes) divided by the same units' reported gross load. Only where every combustion generator is monitored and the gross load is not below EIA net generation; gross, so lower than the net figure, and not comparable with it",
      "coverage": null,
      "denominator": {
       "basis": "gross load the monitored units themselves reported; a combined-cycle unit need not include its steam turbine",
       "metric": "cems_gross_load_mwh",
       "unit": "MWh",
       "value": 11912528.99
      },
      "evidence": "estimated",
      "fact_id": "plant:eia:6076#co2_intensity_gross_t_per_mwh@2023",
      "label": "CO2 per MWh of gross load (unit-reported)",
      "locator": "derived: co2_mass_tonnes@2023 / cems_gross_load_mwh@2023",
      "maturity": "final",
      "method": "derived",
      "metric": "co2_intensity_gross_t_per_mwh",
      "missing_reason": null,
      "note": null,
      "period": {
       "hours": 8760,
       "kind": "calendar_year",
       "period_end": "2024-01-01T00:00:00Z",
       "period_start": "2023-01-01T00:00:00Z",
       "year": 2023
      },
      "precision": 3,
      "quality": "valid",
      "source_ref": "pudl-epacems",
      "unit": "t CO2/MWh",
      "value": 0.9132681298416385
     }
    ],
    "generators_monitored": 2,
    "generators_monitored_other": 0,
    "generators_total": 2,
    "generators_unmonitored": null,
    "hours_by_measurement": {
     "measured": 16025,
     "operating_without_code": 0,
     "other_code": 0,
     "substituted": 234,
     "unit": "operating unit-hours"
    },
    "measured_share": 0.9856079709699244,
    "note": "CO2 reported hourly under 40 CFR Part 75 by this plant's EPA-monitored units and summed over the reporting year, as filed (short tons) and in tonnes. It is a stack total of those units, includes any share attributable to steam sold, and is not CO2-equivalent, lifecycle or consumption-based. EPA-monitored units are one program's population: the figure is not a regional total and an unmonitored plant is not zero.",
    "source_ref": "pudl-epacems",
    "units_monitored": 2,
    "year": 2023
   }
  ],
  "hours_by_measurement": {
   "measured": 14097,
   "operating_without_code": 0,
   "other_code": 0,
   "substituted": 228,
   "unit": "operating unit-hours"
  },
  "measured_share": 0.9840837696335079,
  "note": "CO2 reported hourly under 40 CFR Part 75 by this plant's EPA-monitored units and summed over the reporting year, as filed (short tons) and in tonnes. It is a stack total of those units, includes any share attributable to steam sold, and is not CO2-equivalent, lifecycle or consumption-based. EPA-monitored units are one program's population: the figure is not a regional total and an unmonitored plant is not zero.",
  "source_ref": "pudl-epacems",
  "units_monitored": 2,
  "year": 2024
 },
 "events": [
  {
   "capacity_mw": 716.0,
   "date": "2020-01-05",
   "date_precision": "day",
   "event_id": "colstrip-units-1-2-retired-2020",
   "event_type": "retired",
   "source_publisher": "KULR8",
   "source_ref": "notable-lifecycle-events",
   "source_url": "https://www.kulr8.com/news/colstrip-units-1-and-2-to-be-officially-retired-by-sunday-january-5/article_85b5763a-2d8c-11ea-8946-73c2268e7f26.html",
   "summary": "Talen Montana retired Colstrip's two oldest coal units as no longer economically viable."
  },
  {
   "capacity_mw": 222.0,
   "date": "2023-01-16",
   "date_precision": "day",
   "event_id": "colstrip-avista-share-agreement-2023",
   "event_type": "announced",
   "source_publisher": "Montana Free Press",
   "source_ref": "notable-lifecycle-events",
   "source_url": "https://montanafreepress.org/2023/01/17/northwestern-takes-additional-ownership-in-colstrip-coal-plant/",
   "summary": "NorthWestern Energy agreed to acquire Avista's 15 percent (222 MW) share of Colstrip units 3 and 4 at no cost."
  },
  {
   "capacity_mw": 592.0,
   "date": "2026-01-01",
   "date_precision": "day",
   "event_id": "colstrip-units-3-4-northwestern-majority-2026",
   "event_type": "announced",
   "source_publisher": "Montana Free Press",
   "source_ref": "notable-lifecycle-events",
   "source_url": "https://montanafreepress.org/2024/07/31/northwestern-energy-announces-deal-to-acquire-larger-share-of-colstrip-power-plant/",
   "summary": "Puget Sound Energy's 370 MW and Avista's 222 MW shares of Colstrip units 3-4 transferred to NorthWestern at no cost, raising its stake to 55 percent."
  }
 ],
 "facts": [
  {
   "basis": "Sum of generator nameplate MW with operational status code OP in the inventory year; one row per generator; unscaled by ownership",
   "coverage": {
    "eligible": 2,
    "included": 2,
    "unit": "operating generators"
   },
   "denominator": null,
   "evidence": "reported",
   "fact_id": "plant:eia:6076#nameplate_mw_op@2024",
   "label": "Nameplate capacity, operating generators",
   "locator": "out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=6076",
   "maturity": "final",
   "method": "derived",
   "metric": "nameplate_mw_op",
   "missing_reason": null,
   "note": null,
   "period": {
    "kind": "inventory_year",
    "note": "EIA-860 annual inventory; status as of the end of the reporting year",
    "report_date": "2024-01-01",
    "year": 2024
   },
   "precision": 1,
   "quality": "valid",
   "source_ref": "pudl-generators",
   "unit": "MW",
   "value": 1647.4
  },
  {
   "basis": "Generator rows for the plant in the inventory year, any status",
   "coverage": null,
   "denominator": null,
   "evidence": "reported",
   "fact_id": "plant:eia:6076#generator_count@2024",
   "label": "Generators listed",
   "locator": "out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=6076",
   "maturity": "final",
   "method": "derived",
   "metric": "generator_count",
   "missing_reason": null,
   "note": null,
   "period": {
    "kind": "inventory_year",
    "note": "EIA-860 annual inventory; status as of the end of the reporting year",
    "report_date": "2024-01-01",
    "year": 2024
   },
   "precision": 0,
   "quality": "valid",
   "source_ref": "pudl-generators",
   "unit": "count",
   "value": 4.0
  },
  {
   "basis": "Generator rows with status code OP",
   "coverage": null,
   "denominator": null,
   "evidence": "reported",
   "fact_id": "plant:eia:6076#generator_count_op@2024",
   "label": "Operating generators",
   "locator": "out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=6076",
   "maturity": "final",
   "method": "derived",
   "metric": "generator_count_op",
   "missing_reason": null,
   "note": null,
   "period": {
    "kind": "inventory_year",
    "note": "EIA-860 annual inventory; status as of the end of the reporting year",
    "report_date": "2024-01-01",
    "year": 2024
   },
   "precision": 0,
   "quality": "valid",
   "source_ref": "pudl-generators",
   "unit": "count",
   "value": 2.0
  },
  {
   "basis": "Sum of generator nameplate MW with status code RE as listed in the inventory year's file; not a complete retirement history",
   "coverage": null,
   "denominator": null,
   "evidence": "reported",
   "fact_id": "plant:eia:6076#nameplate_mw_retired@2024",
   "label": "Nameplate capacity, retired generators listed",
   "locator": "out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=6076",
   "maturity": "final",
   "method": "derived",
   "metric": "nameplate_mw_retired",
   "missing_reason": null,
   "note": null,
   "period": {
    "kind": "inventory_year",
    "note": "EIA-860 annual inventory; status as of the end of the reporting year",
    "report_date": "2024-01-01",
    "year": 2024
   },
   "precision": 1,
   "quality": "valid",
   "source_ref": "pudl-generators",
   "unit": "MW",
   "value": 716.0
  },
  {
   "basis": "Sum of EIA-923 annual net generation over the plant's unique prime-mover x energy-source rows; negative values (pumping, station use) retained",
   "coverage": {
    "eligible": 3,
    "included": 3,
    "unit": "plant x prime-mover x fuel rows"
   },
   "denominator": null,
   "evidence": "reported",
   "fact_id": "plant:eia:6076#net_generation_mwh@2024",
   "label": "Net generation",
   "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2024-01-01; plant_id_eia=6076",
   "maturity": "final",
   "method": "derived",
   "metric": "net_generation_mwh",
   "missing_reason": null,
   "note": null,
   "period": {
    "hours": 8784,
    "kind": "calendar_year",
    "period_end": "2025-01-01T00:00:00Z",
    "period_start": "2024-01-01T00:00:00Z",
    "year": 2024
   },
   "precision": 0,
   "quality": "valid",
   "source_ref": "pudl-output",
   "unit": "MWh",
   "value": 9028456.999
  },
  {
   "basis": "Net generation MWh / (operating nameplate MW x hours in year); only when every operating generator was operating before the year began and none retired during it",
   "coverage": null,
   "denominator": {
    "hours": 8784,
    "metric": "nameplate_mw_op",
    "unit": "MW",
    "value": 1647.4
   },
   "evidence": "reported",
   "fact_id": "plant:eia:6076#capacity_factor@2024",
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      "method": "direct",
      "owned_mw": 164.74,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:15248",
       "name": "Portland General Electric"
      },
      "reason": null,
      "source_ref": "pudl-ownership"
     },
     {
      "basis": "reported_schedule",
      "evidence": "reported",
      "fraction": 0.25,
      "locator": "out_eia860__yearly_ownership.parquet; report_date=2024-01-01; plant_id_eia=6076; generator_id=4; owner_utility_id_eia=15500",
      "method": "direct",
      "owned_mw": 205.925,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:15500",
       "name": "Puget Sound Energy"
      },
      "reason": null,
      "source_ref": "pudl-ownership"
     },
     {
      "basis": "reported_schedule",
      "evidence": "reported",
      "fraction": 0.15,
      "locator": "out_eia860__yearly_ownership.parquet; report_date=2024-01-01; plant_id_eia=6076; generator_id=4; owner_utility_id_eia=20169",
      "method": "direct",
      "owned_mw": 123.555,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:20169",
       "name": "Avista"
      },
      "reason": null,
      "source_ref": "pudl-ownership"
     }
    ],
    "unassigned_fraction": 0.0,
    "unassigned_mw": 0.0,
    "unknown_reason": null
   },
   "prime_mover": {
    "code": "ST",
    "label": "steam_turbine"
   },
   "resource_group": "coal",
   "status": {
    "category": "existing",
    "code": "OP",
    "label": "operating"
   },
   "storage": null,
   "technology": "Conventional Steam Coal"
  }
 ],
 "id": "plant:eia:6076",
 "interconnection_requests": [],
 "latest": {
  "changed_on": "2026-08-01",
  "changes_since_baseline": [],
  "edition": {
   "report_month": "2026-08-01",
   "source_ref": "eia860m-inventory",
   "valid_until": "2026-09-01"
  },
  "facts": [
   {
    "basis": "Sum of nameplate MW over generators whose current-valid EIA-860M workbook assertion has status OP; dated by the complete inventory edition; never added to the baseline aggregate",
    "coverage": {
     "eligible": 4,
     "included": 4,
     "unit": "current and historical generators",
     "unknown_current_state": 0
    },
    "denominator": null,
    "evidence": "reported",
    "fact_id": "plant:eia:6076#latest_nameplate_mw_op",
    "label": "Operating nameplate capacity, latest inventory",
    "locator": "Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=6076; report_date=2026-08-01",
    "maturity": "provisional",
    "method": "derived",
    "metric": "latest_nameplate_mw_op",
    "missing_reason": null,
    "note": null,
    "period": {
     "as_of": "2026-08-01",
     "kind": "instant",
     "note": "Complete EIA-860M monthly inventory; assertion dates are not event dates"
    },
    "precision": 1,
    "quality": "valid",
    "source_ref": "eia860m-inventory",
    "unit": "MW",
    "value": 1647.4
   },
   {
    "basis": "Sum of nameplate MW over generators whose current-valid EIA-860M workbook assertion is a proposal or construction stage (P, L, T, U, V, OT, TS); a proposal is not a commitment and its date is a forecast",
    "coverage": {
     "eligible": 4,
     "included": 4,
     "unit": "current and historical generators"
    },
    "denominator": null,
    "evidence": "reported",
    "fact_id": "plant:eia:6076#latest_nameplate_mw_planned",
    "label": "Planned nameplate capacity, latest inventory",
    "locator": "Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=6076; report_date=2026-08-01",
    "maturity": "provisional",
    "method": "derived",
    "metric": "latest_nameplate_mw_planned",
    "missing_reason": "not_applicable",
    "note": null,
    "period": {
     "as_of": "2026-08-01",
     "kind": "instant",
     "note": "Complete EIA-860M monthly inventory; assertion dates are not event dates"
    },
    "precision": 1,
    "quality": "not_applicable",
    "source_ref": "eia860m-inventory",
    "unit": "MW",
    "value": null
   },
   {
    "basis": "Sum of nameplate MW over generators whose current-valid EIA-860M workbook assertion is retired, cancelled or indefinitely postponed (RE, CN, IP); retired is not demolished",
    "coverage": {
     "eligible": 4,
     "included": 4,
     "unit": "current and historical generators"
    },
    "denominator": null,
    "evidence": "reported",
    "fact_id": "plant:eia:6076#latest_nameplate_mw_retired",
    "label": "Retired or cancelled nameplate capacity, latest inventory",
    "locator": "Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=6076; report_date=2026-08-01",
    "maturity": "provisional",
    "method": "derived",
    "metric": "latest_nameplate_mw_retired",
    "missing_reason": null,
    "note": null,
    "period": {
     "as_of": "2026-08-01",
     "kind": "instant",
     "note": "Complete EIA-860M monthly inventory; assertion dates are not event dates"
    },
    "precision": 1,
    "quality": "valid",
    "source_ref": "eia860m-inventory",
    "unit": "MW",
    "value": 716.0
   }
  ],
  "historical_units": [],
  "in_baseline": true,
  "last_retirement_date": "2020-01-01",
  "life": "operating",
  "next_planned_operating_date": null,
  "note": "Independently dated by EIA-860M; the baseline facts above stay the validated edition. Planned dates are forecasts; retired is not demolished.",
  "summary": {
   "mw_entered_service": null,
   "mw_retired_or_cancelled": null,
   "units_entered_service": 0,
   "units_new_since_baseline": 0,
   "units_retired_or_cancelled": 0
  },
  "units": [
   {
    "capacity_mw": 358.0,
    "changed_on": "2026-08-01",
    "dates": {
     "operating": "1975-11-01",
     "planned_operating": null,
     "planned_retirement": null,
     "precision": "month",
     "retirement": "2020-01-01"
    },
    "generator_id": "1",
    "id": "generator:eia:6076:1",
    "in_baseline": true,
    "life": "retired_or_cancelled",
    "resource_group": "coal",
    "status": {
     "category": "retired",
     "code": "RE",
     "label": "retired"
    },
    "technology": "Conventional Steam Coal"
   },
   {
    "capacity_mw": 358.0,
    "changed_on": "2026-08-01",
    "dates": {
     "operating": "1976-08-01",
     "planned_operating": null,
     "planned_retirement": null,
     "precision": "month",
     "retirement": "2020-01-01"
    },
    "generator_id": "2",
    "id": "generator:eia:6076:2",
    "in_baseline": true,
    "life": "retired_or_cancelled",
    "resource_group": "coal",
    "status": {
     "category": "retired",
     "code": "RE",
     "label": "retired"
    },
    "technology": "Conventional Steam Coal"
   },
   {
    "capacity_mw": 823.7,
    "changed_on": "2026-08-01",
    "dates": {
     "operating": "1984-01-01",
     "planned_operating": null,
     "planned_retirement": null,
     "precision": "month",
     "retirement": null
    },
    "generator_id": "3",
    "id": "generator:eia:6076:3",
    "in_baseline": true,
    "life": "operating",
    "resource_group": "coal",
    "status": {
     "category": "existing",
     "code": "OP",
     "label": "operating"
    },
    "technology": "Conventional Steam Coal"
   },
   {
    "capacity_mw": 823.7,
    "changed_on": "2026-08-01",
    "dates": {
     "operating": "1986-04-01",
     "planned_operating": null,
     "planned_retirement": null,
     "precision": "month",
     "retirement": null
    },
    "generator_id": "4",
    "id": "generator:eia:6076:4",
    "in_baseline": true,
    "life": "operating",
    "resource_group": "coal",
    "status": {
     "category": "existing",
     "code": "OP",
     "label": "operating"
    },
    "technology": "Conventional Steam Coal"
   }
  ]
 },
 "location": {
  "city": "Colstrip",
  "county": "Rosebud",
  "datum": null,
  "lat": 45.8831,
  "locator": "out_eia__yearly_plants.parquet; report_date=2024-01-01; plant_id_eia=6076",
  "lon": -106.614,
  "note": "Plant coordinate shared by all generators; not turbine or inverter locations. Source datum field empty in this edition.",
  "quality": "source_reported",
  "source_ref": "pudl-plants",
  "state": "MT",
  "timezone": "America/Denver"
 },
 "name": "Colstrip Steam Electric Station",
 "operator": {
  "entity_type": "Q",
  "entity_type_label": "Independent power producer",
  "id": "org:eia:15298",
  "name": "Talen Montana"
 },
 "output": {
  "annual": [
   {
    "components": [
     {
      "energy_source": {
       "code": "DFO",
       "fuel_group": "oil",
       "label": "distillate_fuel_oil"
      },
      "maturity": "final",
      "net_generation_mwh": 5713.98,
      "prime_mover": {
       "code": "ST",
       "label": "steam_turbine"
      }
     },
     {
      "energy_source": {
       "code": "PG",
       "fuel_group": "gas",
       "label": "propane_gas"
      },
      "maturity": "final",
      "net_generation_mwh": 0.0,
      "prime_mover": {
       "code": "ST",
       "label": "steam_turbine"
      }
     },
     {
      "energy_source": {
       "code": "SUB",
       "fuel_group": "coal",
       "label": "subbituminous_coal"
      },
      "maturity": "final",
      "net_generation_mwh": 14831369.88,
      "prime_mover": {
       "code": "ST",
       "label": "steam_turbine"
      }
     },
     {
      "energy_source": {
       "code": "WO",
       "fuel_group": "oil",
       "label": "waste_oil"
      },
      "maturity": "final",
      "net_generation_mwh": 7191.034,
      "prime_mover": {
       "code": "ST",
       "label": "steam_turbine"
      }
     }
    ],
    "fact": {
     "basis": "Sum of EIA-923 annual net generation over the plant's unique prime-mover x energy-source rows; negative values (pumping, station use) retained",
     "coverage": {
      "eligible": 4,
      "included": 4,
      "unit": "plant x prime-mover x fuel rows"
     },
     "denominator": null,
     "evidence": "reported",
     "fact_id": "plant:eia:6076#net_generation_mwh@2015",
     "label": "Net generation",
     "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2015-01-01; plant_id_eia=6076",
     "maturity": "final",
     "method": "derived",
     "metric": "net_generation_mwh",
     "missing_reason": null,
     "note": null,
     "period": {
      "hours": 8760,
      "kind": "calendar_year",
      "period_end": "2016-01-01T00:00:00Z",
      "period_start": "2015-01-01T00:00:00Z",
      "year": 2015
     },
     "precision": 0,
     "quality": "valid",
     "source_ref": "pudl-output",
     "unit": "MWh",
     "value": 14844274.894000001
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    "rows": 4,
    "year": 2015
   },
   {
    "components": [
     {
      "energy_source": {
       "code": "DFO",
       "fuel_group": "oil",
       "label": "distillate_fuel_oil"
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       "label": "steam_turbine"
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     },
     {
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       "label": "propane_gas"
      },
      "maturity": "final",
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      "prime_mover": {
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       "label": "steam_turbine"
      }
     },
     {
      "energy_source": {
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       "fuel_group": "coal",
       "label": "subbituminous_coal"
      },
      "maturity": "final",
      "net_generation_mwh": 13342713.409999998,
      "prime_mover": {
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       "label": "steam_turbine"
      }
     },
     {
      "energy_source": {
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       "fuel_group": "oil",
       "label": "waste_oil"
      },
      "maturity": "final",
      "net_generation_mwh": 6641.073000000001,
      "prime_mover": {
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       "label": "steam_turbine"
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     }
    ],
    "fact": {
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     "coverage": {
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      "unit": "plant x prime-mover x fuel rows"
     },
     "denominator": null,
     "evidence": "reported",
     "fact_id": "plant:eia:6076#net_generation_mwh@2016",
     "label": "Net generation",
     "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2016-01-01; plant_id_eia=6076",
     "maturity": "final",
     "method": "derived",
     "metric": "net_generation_mwh",
     "missing_reason": null,
     "note": null,
     "period": {
      "hours": 8784,
      "kind": "calendar_year",
      "period_end": "2017-01-01T00:00:00Z",
      "period_start": "2016-01-01T00:00:00Z",
      "year": 2016
     },
     "precision": 0,
     "quality": "valid",
     "source_ref": "pudl-output",
     "unit": "MWh",
     "value": 13358656.066999998
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    "rows": 4,
    "year": 2016
   },
   {
    "components": [
     {
      "energy_source": {
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       "fuel_group": "oil",
       "label": "distillate_fuel_oil"
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     },
     {
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      "prime_mover": {
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       "label": "steam_turbine"
      }
     },
     {
      "energy_source": {
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       "label": "subbituminous_coal"
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      "maturity": "final",
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     },
     {
      "energy_source": {
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       "label": "waste_oil"
      },
      "maturity": "final",
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     }
    ],
    "fact": {
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     "coverage": {
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      "unit": "plant x prime-mover x fuel rows"
     },
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     "fact_id": "plant:eia:6076#net_generation_mwh@2017",
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     "missing_reason": null,
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     "period": {
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      "period_end": "2018-01-01T00:00:00Z",
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   },
   {
    "components": [
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     },
     {
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     },
     {
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     }
    ],
    "fact": {
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   {
    "components": [
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     },
     {
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     },
     {
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      "maturity": "final",
      "net_generation_mwh": 3981.723,
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     }
    ],
    "fact": {
     "basis": "Sum of EIA-923 annual net generation over the plant's unique prime-mover x energy-source rows; negative values (pumping, station use) retained",
     "coverage": {
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     "fact_id": "plant:eia:6076#net_generation_mwh@2019",
     "label": "Net generation",
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      "period_start": "2019-01-01T00:00:00Z",
      "year": 2019
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     "precision": 0,
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     "source_ref": "pudl-output",
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     "value": 13407681.858
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   {
    "components": [
     {
      "energy_source": {
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     },
     {
      "energy_source": {
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      "prime_mover": {
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       "label": "steam_turbine"
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     },
     {
      "energy_source": {
       "code": "SUB",
       "fuel_group": "coal",
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      "maturity": "final",
      "net_generation_mwh": 7926039.97,
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       "label": "steam_turbine"
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    2017,
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  "basis": "Physical capacity once (operating nameplate MW); each direct owner's share and owned MW on its existing basis; up each curated chain, exposure = MW below x the stated hop share, so it exists only while every hop is stated. MW stays at the last stated entity where a filing states control without a share. Direct MW and parent MW are two views of the same capacity and are never added together.",
  "capacity": {
   "locator": "out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=6076",
   "metric": "nameplate_mw_op",
   "note": "Physical capacity, counted once; every MW below is a share of it, not an addition to it",
   "source_ref": "pudl-generators",
   "unit": "MW",
   "value": 1647.4
  },
  "chain_ends_without_exposure": [
   {
    "entity": {
     "id": "org:curated:aimco",
     "name": "Alberta Investment Management Corporation"
    },
    "kind": "curation_ends",
    "note": "The chain reaches this entity through a hop whose share the filing does not state, so no MW is attributed to it",
    "reason": "unstated_hop_below",
    "via_direct_owners": [
     "org:eia:15500"
    ]
   },
   {
    "entity": {
     "id": "org:curated:bci",
     "name": "British Columbia Investment Management Corporation"
    },
    "kind": "curation_ends",
    "note": "The chain reaches this entity through a hop whose share the filing does not state, so no MW is attributed to it",
    "reason": "unstated_hop_below",
    "via_direct_owners": [
     "org:eia:15500"
    ]
   },
   {
    "entity": {
     "id": "org:curated:macquarie-washington-clean-energy-investment-lp",
     "name": "Macquarie Washington Clean Energy Investment, L.P."
    },
    "kind": "curation_ends",
    "note": "The chain reaches this entity through a hop whose share the filing does not state, so no MW is attributed to it",
    "reason": "unstated_hop_below",
    "via_direct_owners": [
     "org:eia:15500"
    ]
   },
   {
    "entity": {
     "id": "org:curated:omers",
     "name": "Ontario Municipal Employees Retirement System"
    },
    "kind": "curation_ends",
    "note": "The chain reaches this entity through a hop whose share the filing does not state, so no MW is attributed to it",
    "reason": "unstated_hop_below",
    "via_direct_owners": [
     "org:eia:15500"
    ]
   },
   {
    "entity": {
     "id": "org:curated:ontario-teachers-pension-plan-board",
     "name": "Ontario Teachers' Pension Plan Board"
    },
    "kind": "curation_ends",
    "note": "The chain reaches this entity through a hop whose share the filing does not state, so no MW is attributed to it",
    "reason": "unstated_hop_below",
    "via_direct_owners": [
     "org:eia:15500"
    ]
   },
   {
    "entity": {
     "id": "org:curated:pggm",
     "name": "PGGM Vermogensbeheer B.V."
    },
    "kind": "curation_ends",
    "note": "The chain reaches this entity through a hop whose share the filing does not state, so no MW is attributed to it",
    "reason": "unstated_hop_below",
    "via_direct_owners": [
     "org:eia:15500"
    ]
   },
   {
    "entity": {
     "id": "org:sec:1622536",
     "name": "Talen Energy Corporation"
    },
    "kind": "publicly_held",
    "note": "The chain reaches this entity through a hop whose share the filing does not state, so no MW is attributed to it",
    "reason": "unstated_hop_below",
    "via_direct_owners": [
     "org:eia:15298"
    ]
   }
  ],
  "checked": "2026-09-21",
  "direct_owners": [
   {
    "all_hops_stated": false,
    "generators": 2,
    "owned_mw": 411.85,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:15500",
     "name": "Puget Sound Energy"
    },
    "terminal_kinds": [
     "share_not_stated"
    ]
   },
   {
    "all_hops_stated": true,
    "generators": 2,
    "owned_mw": 329.48,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:15248",
     "name": "Portland General Electric"
    },
    "terminal_kinds": [
     "publicly_held"
    ]
   },
   {
    "all_hops_stated": true,
    "generators": 1,
    "owned_mw": 247.11,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:13902",
     "name": "NorthWestern Energy"
    },
    "terminal_kinds": [
     "publicly_held"
    ]
   },
   {
    "all_hops_stated": false,
    "generators": 1,
    "owned_mw": 247.11,
    "owner": {
     "entity_type": "Q",
     "entity_type_label": "Independent power producer",
     "id": "org:eia:15298",
     "name": "Talen Montana"
    },
    "terminal_kinds": [
     "share_not_stated"
    ]
   },
   {
    "all_hops_stated": true,
    "generators": 2,
    "owned_mw": 247.11,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:20169",
     "name": "Avista"
    },
    "terminal_kinds": [
     "publicly_held"
    ]
   },
   {
    "all_hops_stated": true,
    "generators": 2,
    "owned_mw": 164.74,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:14354",
     "name": "PacifiCorp"
    },
    "terminal_kinds": [
     "publicly_held"
    ]
   }
  ],
  "direct_share_changes_after_inventory": [
   {
    "checked": "2026-09-21",
    "consideration": "USD 0",
    "effective_date": "2026-01-01",
    "from": {
     "id": "org:eia:20169",
     "name": "Avista Corporation"
    },
    "generator_ids": [
     "3",
     "4"
    ],
    "locator": "NorthWestern Energy Group Form 10-K for FY2025, Item 7 \"Colstrip Acquisitions and Requests for Cost Recovery\": \"we entered into definitive agreements with Avista and Puget to acquire their respective interests in Colstrip Units 3 and 4 for $0 and completed these acquisitions on January 1, 2026\"; \"The 222 megawatts of generation capacity from Colstrip Units 3 and 4 acquired from Avista (Avista Interests) on January 1, 2026\"",
    "mw_as_stated_by_source": 222.0,
    "mw_basis": "the filing's own capacity figure, not the release's nameplate; never added to any total here",
    "note": "Share is the seller's stated interest in each unit (Avista FY2025 10-K, Item 7: \"We previously held a 15 percent interest in Units 3 and 4 of Colstrip\"; \"On January 1, 2026, the Company transferred its ownership in Colstrip to NorthWestern\"). The 222 MW is NorthWestern's figure, on its own capacity basis, not the release's nameplate. Exhibit 21 lists a NorthWestern Colstrip 222Av LLC without stating what it holds, so the acquirer is recorded as the group (\"we\")",
    "reviewer": "claude-w65",
    "share_of_each_generator": 0.15,
    "source_url": "https://www.sec.gov/Archives/edgar/data/1993004/000199300426000006/nweg-20251231.htm",
    "to": {
     "id": "org:sec:1993004",
     "name": "NorthWestern Energy Group, Inc."
    }
   },
   {
    "checked": "2026-09-21",
    "consideration": "USD 0",
    "effective_date": "2026-01-01",
    "from": {
     "id": "org:eia:15500",
     "name": "Puget Sound Energy, Inc."
    },
    "generator_ids": [
     "3",
     "4"
    ],
    "locator": "NorthWestern Energy Group Form 10-K for FY2025, Item 7: \"The 370 megawatts of generation capacity from Colstrip Units 3 and 4 acquired from Puget (Puget Interests) on January 1, 2026, increases our ownership share of the facility to 55 percent\"; defined terms: \"NorthWestern Colstrip 370Pu, LLC (NW Colstrip 370) - a direct, wholly-owned FERC regulated subsidiary of NorthWestern Energy Group, which has a 25 percent ownership interest in Colstrip Units 3 & 4\"; \"The 370 MW interest in Colstrip Units 3 & 4 acquired from Puget is owned by NW Colstrip 370\"",
    "mw_as_stated_by_source": 370.0,
    "mw_basis": "the filing's own capacity figure, not the release's nameplate; never added to any total here",
    "note": "Share is the seller's interest in each unit as EIA-860 2024 reports it (25 percent of Units 3 and 4) and as NorthWestern states for NW Colstrip 370. The 370 MW is NorthWestern's figure on its own capacity basis. Consideration \"$0\" as stated. NW Colstrip 370 is a direct, wholly-owned subsidiary of NorthWestern Energy Group (org:sec:1993004)",
    "reviewer": "claude-w65",
    "share_of_each_generator": 0.25,
    "source_url": "https://www.sec.gov/Archives/edgar/data/1993004/000199300426000006/nweg-20251231.htm",
    "to": {
     "id": "org:curated:northwestern-colstrip-370pu-llc",
     "name": "NorthWestern Colstrip 370Pu, LLC"
    }
   }
  ],
  "excluded_generators": [
   {
    "capacity_mw": 358.0,
    "generator_id": "1",
    "reason": "not_operating",
    "status": "RE"
   },
   {
    "capacity_mw": 358.0,
    "generator_id": "2",
    "reason": "not_operating",
    "status": "RE"
   }
  ],
  "generators": [
   {
    "attributable_mw": 823.7,
    "capacity_mw": 823.7,
    "direct_owners": [
     {
      "all_hops_stated": true,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:eia:14354",
         "name": "PacifiCorp"
        },
        "cumulative_share": 0.1,
        "depth": 1,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 82.37,
        "locator": "Berkshire Hathaway Energy combined Form 10-K for FY2025 (filed 2026-03-02; registrants include PacifiCorp), Part II Item 5: \"All common stock of PacifiCorp is held by its parent company, PPW Holdings LLC\"; Exhibit 21.1 lists PPW Holdings LLC (Delaware) and PacifiCorp (Oregon)",
        "note": "\"All common stock\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:curated:ppw-holdings-llc",
         "name": "PPW Holdings LLC"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1081316/000108131626000003/bhe-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:ppw-holdings-llc",
         "name": "PPW Holdings LLC"
        },
        "cumulative_share": 0.1,
        "depth": 2,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 82.37,
        "locator": "Part II Item 5: PPW Holdings LLC \"is a direct, wholly owned subsidiary of BHE\"",
        "note": "\"Wholly owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:sec:1081316",
         "name": "Berkshire Hathaway Energy Company"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1081316/000108131626000003/bhe-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:sec:1081316",
         "name": "Berkshire Hathaway Energy Company"
        },
        "cumulative_share": 0.1,
        "depth": 3,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 82.37,
        "locator": "Item 8, PacifiCorp Note 1 Organization and Operations: \"BHE is a wholly owned subsidiary of Berkshire Hathaway Inc.\"; Part II Item 5: \"BHE's common stock is held by Berkshire Hathaway, and has not been registered with the SEC ... listed on a stock exchange or otherwise publicly held or traded\"",
        "note": "\"Wholly owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:sec:1067983",
         "name": "Berkshire Hathaway Inc."
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1081316/000108131626000003/bhe-20251231.htm"
       }
      ],
      "owned_mw": 82.37,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:14354",
       "name": "PacifiCorp"
      },
      "share": 0.1,
      "terminals": [
       {
        "cumulative_share": 0.1,
        "depth": 3,
        "entity": {
         "id": "org:sec:1067983",
         "name": "Berkshire Hathaway Inc."
        },
        "exposure_mw": 82.37,
        "exposure_reason": null,
        "kind": "publicly_held",
        "locator": "Berkshire Hathaway Inc. Form 10-K for FY2025 (filed 2026-03-02), cover page: Class A and Class B common stock registered under Section 12(b) on the New York Stock Exchange; Item 1: \"a holding company owning subsidiaries engaged in numerous diverse business activities\"",
        "note": "Beneficial owners above 5 percent are in the proxy statement and are not curated",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1067983/000119312526083899/brka-20251231.htm"
       }
      ],
      "unnamed_remainders": []
     },
     {
      "all_hops_stated": true,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [],
      "owned_mw": 164.74,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:15248",
       "name": "Portland General Electric"
      },
      "share": 0.2,
      "terminals": [
       {
        "cumulative_share": 0.2,
        "depth": 0,
        "entity": {
         "id": "org:eia:15248",
         "name": "Portland General Electric Company"
        },
        "exposure_mw": 164.74,
        "exposure_reason": null,
        "kind": "publicly_held",
        "locator": "Portland General Electric Form 10-K for FY2025 (filed 2026-02-17), cover page: common stock registered under Section 12(b), trading symbol POR, New York Stock Exchange; Item 1: \"The Company also has a 20% ownership interest in the Colstrip Units 3 and 4 coal-fired generating plant\", operated by a third party",
        "note": "No holding company above the utility on the filing date: Item 7 records an application to the OPUC on July 25, 2025 for a holding-company reorganization, pending. Beneficial owners above 5 percent are in the proxy statement and are not curated",
        "source_url": "https://www.sec.gov/Archives/edgar/data/784977/000119312526052750/por-20251231.htm"
       }
      ],
      "unnamed_remainders": []
     },
     {
      "all_hops_stated": false,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:eia:15298",
         "name": "Talen Montana, LLC"
        },
        "cumulative_share": null,
        "depth": 1,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Talen Energy Corporation Form 10-K for FY2025 (filed 2026-02-26), Item 1: \"Talen Montana, LLC, a Talen subsidiary that operates Colstrip, owns an undivided interest in Colstrip Unit 3\"; \"Talen Energy Supply, LLC, a direct subsidiary of Talen Energy Corporation that, thorough subsidiaries, indirectly holds all of Talen's assets and operations\"; Exhibit 21.1 lists Talen Montana, LLC and Talen Montana Holdings, LLC (Delaware)",
        "note": "Control is stated, the share is not: no sentence gives Talen Montana's ownership percentage or names its immediate member, and Exhibit 21.1 lists subsidiaries without percentages. Avista's FY2025 10-K calls Talen Montana \"an indirect subsidiary of Talen Energy Corporation\". Talen's own Item 1: \"Talen Montana owns 30 % of Colstrip Unit 3 and does not own any portion of Colstrip Unit 4\"",
        "parent": {
         "id": "org:curated:talen-energy-supply-llc",
         "name": "Talen Energy Supply, LLC"
        },
        "relation": "subsidiary",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1622536/000162253626000017/tln-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:talen-energy-supply-llc",
         "name": "Talen Energy Supply, LLC"
        },
        "cumulative_share": null,
        "depth": 2,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Schedule I (condensed financial information of registrant), Note 1 Basis of Presentation: \"Talen Energy Corporation is a holding company whose only material businesses and properties are held through its direct and wholly owned subsidiary, Talen Energy Supply\"",
        "note": "\"Wholly owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:sec:1622536",
         "name": "Talen Energy Corporation"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1622536/000162253626000017/tln-20251231.htm"
       }
      ],
      "owned_mw": 247.11,
      "owner": {
       "entity_type": "Q",
       "entity_type_label": "Independent power producer",
       "id": "org:eia:15298",
       "name": "Talen Montana"
      },
      "share": 0.3,
      "terminals": [
       {
        "cumulative_share": null,
        "depth": 2,
        "entity": {
         "id": "org:sec:1622536",
         "name": "Talen Energy Corporation"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "publicly_held",
        "locator": "Cover page: common stock, par value $0.001 per share, trading symbol TLN, The Nasdaq Global Select Market",
        "note": "Beneficial owners above 5 percent are in the proxy statement and are not curated",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1622536/000162253626000017/tln-20251231.htm"
       },
       {
        "cumulative_share": 0.3,
        "depth": 0,
        "entity": {
         "id": "org:eia:15298",
         "name": "Talen Montana, LLC"
        },
        "exposure_mw": 247.11,
        "kind": "share_not_stated",
        "locator": "Talen Energy Corporation Form 10-K for FY2025 (filed 2026-02-26), Item 1: \"Talen Montana, LLC, a Talen subsidiary that operates Colstrip, owns an undivided interest in Colstrip Unit 3\"; \"Talen Energy Supply, LLC, a direct subsidiary of Talen Energy Corporation that, thorough subsidiaries, indirectly holds all of Talen's assets and operations\"; Exhibit 21.1 lists Talen Montana, LLC and Talen Montana Holdings, LLC (Delaware)",
        "note": "The filing states these parents without a share; the MW stays attributed here and is not split among them",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1622536/000162253626000017/tln-20251231.htm",
        "unresolved_parents": [
         {
          "id": "org:curated:talen-energy-supply-llc",
          "name": "Talen Energy Supply, LLC",
          "relation": "subsidiary",
          "share_reason": "share_not_stated_in_source"
         }
        ]
       }
      ],
      "unnamed_remainders": []
     },
     {
      "all_hops_stated": false,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:eia:15500",
         "name": "Puget Sound Energy, Inc."
        },
        "cumulative_share": 0.25,
        "depth": 1,
        "effective_date": "2026-02-19",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 205.925,
        "locator": "Puget Energy and PSE Form 10-K for FY2025 (filed 2026-02-19), Part III Item 12 beneficial ownership table: \"Puget Energy holds 100.0% of the outstanding common stock of PSE\", 85,903,791 shares as of February 19, 2026; Exhibit 21.1 lists PSE as a subsidiary of Puget Energy",
        "note": "EIA utility 15500 is Puget Sound Energy, Inc. (Item 1: \"PSE is a public utility incorporated in the state of Washington in 1960\")",
        "parent": {
         "id": "org:sec:1085392",
         "name": "Puget Energy, Inc."
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:sec:1085392",
         "name": "Puget Energy, Inc."
        },
        "cumulative_share": 0.25,
        "depth": 2,
        "effective_date": "2026-02-19",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 205.925,
        "locator": "Part III Item 12: \"Puget Equico LLC (Puget Equico) and its affiliates beneficially own 100.0% of the outstanding common stock of Puget Energy\" (200 shares as of February 19, 2026); footnote 1 calls Puget Equico \"Puget Energy's parent company\"",
        "note": "The 200 shares are pledged to JPMorgan Chase Bank, N.A. as administrative agent under Puget Equico's Pledge Agreement (footnote 2); a pledge is security, not ownership",
        "parent": {
         "id": "org:curated:puget-equico-llc",
         "name": "Puget Equico LLC"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-equico-llc",
         "name": "Puget Equico LLC"
        },
        "cumulative_share": 0.25,
        "depth": 3,
        "effective_date": "2026-02-19",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 205.925,
        "locator": "Part III Item 12 footnote 1: \"Puget Equico is a wholly-owned subsidiary of Puget Intermediate\"; the footnote's as-of date is February 19, 2026",
        "note": "\"Wholly-owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:curated:puget-intermediate-holdings-inc",
         "name": "Puget Intermediate Holdings Inc."
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-intermediate-holdings-inc",
         "name": "Puget Intermediate Holdings Inc."
        },
        "cumulative_share": 0.25,
        "depth": 4,
        "effective_date": "2026-02-19",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 205.925,
        "locator": "Part III Item 12 footnote 1: \"Puget Intermediate is a wholly-owned subsidiary of Puget Holdings and the Investors are the direct or indirect owners of Puget Holdings\"",
        "note": "\"Wholly-owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1: \"Puget Holdings is owned by a consortium of long-term infrastructure investors including the British Columbia Investment Management Corporation (BCIMC), the Alberta Investment Management Corporation (AIMCo), Ontario Municipal Employee Retirement System (OMERS), PGGM Vermogensbeheer B.V., Macquarie Washington Clean Energy Investment, L.P., and the Ontario Teachers' Pension Plan Board\"; Item 12 footnote 1 cites Schedule 13D/A of February 13, 2009",
        "note": "No percentage is stated in the 10-K and the list is introduced with \"including\"; the MW attributed to Puget Holdings is not split further",
        "parent": {
         "id": "org:curated:bci",
         "name": "British Columbia Investment Management Corporation"
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row); Item 12 footnote 1 names PIP2PX (Pad) Ltd. and PIP2GV (Pad) Ltd., Edmonton, among the Investors",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:aimco",
         "name": "Alberta Investment Management Corporation"
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row); Item 12 footnote 1 lists OMERS among the Investors",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:omers",
         "name": "Ontario Municipal Employees Retirement System"
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row); Item 12 footnote 1 lists PGGM among the Investors",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:pggm",
         "name": "PGGM Vermogensbeheer B.V."
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row)",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:macquarie-washington-clean-energy-investment-lp",
         "name": "Macquarie Washington Clean Energy Investment, L.P."
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row)",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:ontario-teachers-pension-plan-board",
         "name": "Ontario Teachers' Pension Plan Board"
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       }
      ],
      "owned_mw": 205.925,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:15500",
       "name": "Puget Sound Energy"
      },
      "share": 0.25,
      "terminals": [
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:bci",
         "name": "British Columbia Investment Management Corporation"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:aimco",
         "name": "Alberta Investment Management Corporation"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:omers",
         "name": "Ontario Municipal Employees Retirement System"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:pggm",
         "name": "PGGM Vermogensbeheer B.V."
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:macquarie-washington-clean-energy-investment-lp",
         "name": "Macquarie Washington Clean Energy Investment, L.P."
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:ontario-teachers-pension-plan-board",
         "name": "Ontario Teachers' Pension Plan Board"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": 0.25,
        "depth": 4,
        "entity": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "exposure_mw": 205.925,
        "kind": "share_not_stated",
        "locator": "Part I Item 1: \"Puget Holdings is owned by a consortium of long-term infrastructure investors including the British Columbia Investment Management Corporation (BCIMC), the Alberta Investment Management Corporation (AIMCo), Ontario Municipal Employee Retirement System (OMERS), PGGM Vermogensbeheer B.V., Macquarie Washington Clean Energy Investment, L.P., and the Ontario Teachers' Pension Plan Board\"; Item 12 footnote 1 cites Schedule 13D/A of February 13, 2009",
        "note": "The filing states these parents without a share; the MW stays attributed here and is not split among them",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm",
        "unresolved_parents": [
         {
          "id": "org:curated:bci",
          "name": "British Columbia Investment Management Corporation",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:aimco",
          "name": "Alberta Investment Management Corporation",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:omers",
          "name": "Ontario Municipal Employees Retirement System",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:pggm",
          "name": "PGGM Vermogensbeheer B.V.",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:macquarie-washington-clean-energy-investment-lp",
          "name": "Macquarie Washington Clean Energy Investment, L.P.",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:ontario-teachers-pension-plan-board",
          "name": "Ontario Teachers' Pension Plan Board",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         }
        ]
       }
      ],
      "unnamed_remainders": []
     },
     {
      "all_hops_stated": true,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [],
      "owned_mw": 123.555,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:20169",
       "name": "Avista"
      },
      "share": 0.15,
      "terminals": [
       {
        "cumulative_share": 0.15,
        "depth": 0,
        "entity": {
         "id": "org:eia:20169",
         "name": "Avista Corporation"
        },
        "exposure_mw": 123.555,
        "exposure_reason": null,
        "kind": "publicly_held",
        "locator": "Avista Corporation Form 10-K for FY2025 (filed 2026-02-25), cover page: common stock, trading symbol AVA, New York Stock Exchange; Exhibit 21 lists Avista's own subsidiaries and no parent",
        "note": "Item 7 (Colstrip): \"We previously held a 15 percent interest in Units 3 and 4 of Colstrip\" and \"On January 1, 2026, the Company transferred its ownership in Colstrip to NorthWestern\"; recorded in ownership_transfers.csv. Beneficial owners above 5 percent are in the proxy statement and are not curated",
        "source_url": "https://www.sec.gov/Archives/edgar/data/104918/000119312526067872/ava-20251231.htm"
       }
      ],
      "unnamed_remainders": []
     }
    ],
    "generator_id": "3",
    "invalid_shares": false,
    "ownership_basis": "reported_schedule",
    "residual_components": {
     "direct_unassigned_mw": 0.0,
     "direct_unknown_mw": 0.0,
     "unnamed_remainder_mw": 0.0
    },
    "status": "OP",
    "unknown_reason": null,
    "unknown_residual_mw": 0.0
   },
   {
    "attributable_mw": 823.7,
    "capacity_mw": 823.7,
    "direct_owners": [
     {
      "all_hops_stated": true,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:eia:13902",
         "name": "NorthWestern Corporation"
        },
        "cumulative_share": 0.3,
        "depth": 1,
        "effective_date": "2025-12-31",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 247.11,
        "locator": "NorthWestern Energy Group Form 10-K for FY2025 (filed 2026-02-12), defined terms: \"NorthWestern Corporation (NW Corp) - A direct, wholly-owned regulated utility subsidiary of NorthWestern Energy Group providing both electric and natural gas services in Montana\"; Exhibit 21 (as of December 31, 2025) lists NorthWestern Corporation, Delaware",
        "note": "EIA utility 13902 (\"NorthWestern Energy\", MT) is the Montana utility that reports the 30 percent interest in Colstrip Unit 4; ferc1_utilities.csv identifies it as NorthWestern Corporation (Montana). \"Wholly-owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:sec:1993004",
         "name": "NorthWestern Energy Group, Inc."
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1993004/000199300426000006/nweg-20251231.htm"
       }
      ],
      "owned_mw": 247.11,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:13902",
       "name": "NorthWestern Energy"
      },
      "share": 0.3,
      "terminals": [
       {
        "cumulative_share": 0.3,
        "depth": 1,
        "entity": {
         "id": "org:sec:1993004",
         "name": "NorthWestern Energy Group, Inc."
        },
        "exposure_mw": 247.11,
        "exposure_reason": null,
        "kind": "publicly_held",
        "locator": "Cover page: common stock, trading symbol NWE, Nasdaq Stock Market LLC; Item 1: \"as of January 1, 2026, we have a 55 percent ownership of Units 3 & 4\"",
        "note": "An all-stock merger of equals with Black Hills Corporation under the Agreement and Plan of Merger dated August 18, 2025 is pending on the filing date; the combined company is to be named Bright Horizon Energy Corporation. Not a change of parent until it closes. Beneficial owners above 5 percent are in the proxy statement and are not curated",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1993004/000199300426000006/nweg-20251231.htm"
       }
      ],
      "unnamed_remainders": []
     },
     {
      "all_hops_stated": true,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:eia:14354",
         "name": "PacifiCorp"
        },
        "cumulative_share": 0.1,
        "depth": 1,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 82.37,
        "locator": "Berkshire Hathaway Energy combined Form 10-K for FY2025 (filed 2026-03-02; registrants include PacifiCorp), Part II Item 5: \"All common stock of PacifiCorp is held by its parent company, PPW Holdings LLC\"; Exhibit 21.1 lists PPW Holdings LLC (Delaware) and PacifiCorp (Oregon)",
        "note": "\"All common stock\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:curated:ppw-holdings-llc",
         "name": "PPW Holdings LLC"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1081316/000108131626000003/bhe-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:ppw-holdings-llc",
         "name": "PPW Holdings LLC"
        },
        "cumulative_share": 0.1,
        "depth": 2,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 82.37,
        "locator": "Part II Item 5: PPW Holdings LLC \"is a direct, wholly owned subsidiary of BHE\"",
        "note": "\"Wholly owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:sec:1081316",
         "name": "Berkshire Hathaway Energy Company"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1081316/000108131626000003/bhe-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:sec:1081316",
         "name": "Berkshire Hathaway Energy Company"
        },
        "cumulative_share": 0.1,
        "depth": 3,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 82.37,
        "locator": "Item 8, PacifiCorp Note 1 Organization and Operations: \"BHE is a wholly owned subsidiary of Berkshire Hathaway Inc.\"; Part II Item 5: \"BHE's common stock is held by Berkshire Hathaway, and has not been registered with the SEC ... listed on a stock exchange or otherwise publicly held or traded\"",
        "note": "\"Wholly owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:sec:1067983",
         "name": "Berkshire Hathaway Inc."
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1081316/000108131626000003/bhe-20251231.htm"
       }
      ],
      "owned_mw": 82.37,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:14354",
       "name": "PacifiCorp"
      },
      "share": 0.1,
      "terminals": [
       {
        "cumulative_share": 0.1,
        "depth": 3,
        "entity": {
         "id": "org:sec:1067983",
         "name": "Berkshire Hathaway Inc."
        },
        "exposure_mw": 82.37,
        "exposure_reason": null,
        "kind": "publicly_held",
        "locator": "Berkshire Hathaway Inc. Form 10-K for FY2025 (filed 2026-03-02), cover page: Class A and Class B common stock registered under Section 12(b) on the New York Stock Exchange; Item 1: \"a holding company owning subsidiaries engaged in numerous diverse business activities\"",
        "note": "Beneficial owners above 5 percent are in the proxy statement and are not curated",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1067983/000119312526083899/brka-20251231.htm"
       }
      ],
      "unnamed_remainders": []
     },
     {
      "all_hops_stated": true,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [],
      "owned_mw": 164.74,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:15248",
       "name": "Portland General Electric"
      },
      "share": 0.2,
      "terminals": [
       {
        "cumulative_share": 0.2,
        "depth": 0,
        "entity": {
         "id": "org:eia:15248",
         "name": "Portland General Electric Company"
        },
        "exposure_mw": 164.74,
        "exposure_reason": null,
        "kind": "publicly_held",
        "locator": "Portland General Electric Form 10-K for FY2025 (filed 2026-02-17), cover page: common stock registered under Section 12(b), trading symbol POR, New York Stock Exchange; Item 1: \"The Company also has a 20% ownership interest in the Colstrip Units 3 and 4 coal-fired generating plant\", operated by a third party",
        "note": "No holding company above the utility on the filing date: Item 7 records an application to the OPUC on July 25, 2025 for a holding-company reorganization, pending. Beneficial owners above 5 percent are in the proxy statement and are not curated",
        "source_url": "https://www.sec.gov/Archives/edgar/data/784977/000119312526052750/por-20251231.htm"
       }
      ],
      "unnamed_remainders": []
     },
     {
      "all_hops_stated": false,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:eia:15500",
         "name": "Puget Sound Energy, Inc."
        },
        "cumulative_share": 0.25,
        "depth": 1,
        "effective_date": "2026-02-19",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 205.925,
        "locator": "Puget Energy and PSE Form 10-K for FY2025 (filed 2026-02-19), Part III Item 12 beneficial ownership table: \"Puget Energy holds 100.0% of the outstanding common stock of PSE\", 85,903,791 shares as of February 19, 2026; Exhibit 21.1 lists PSE as a subsidiary of Puget Energy",
        "note": "EIA utility 15500 is Puget Sound Energy, Inc. (Item 1: \"PSE is a public utility incorporated in the state of Washington in 1960\")",
        "parent": {
         "id": "org:sec:1085392",
         "name": "Puget Energy, Inc."
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:sec:1085392",
         "name": "Puget Energy, Inc."
        },
        "cumulative_share": 0.25,
        "depth": 2,
        "effective_date": "2026-02-19",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 205.925,
        "locator": "Part III Item 12: \"Puget Equico LLC (Puget Equico) and its affiliates beneficially own 100.0% of the outstanding common stock of Puget Energy\" (200 shares as of February 19, 2026); footnote 1 calls Puget Equico \"Puget Energy's parent company\"",
        "note": "The 200 shares are pledged to JPMorgan Chase Bank, N.A. as administrative agent under Puget Equico's Pledge Agreement (footnote 2); a pledge is security, not ownership",
        "parent": {
         "id": "org:curated:puget-equico-llc",
         "name": "Puget Equico LLC"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-equico-llc",
         "name": "Puget Equico LLC"
        },
        "cumulative_share": 0.25,
        "depth": 3,
        "effective_date": "2026-02-19",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 205.925,
        "locator": "Part III Item 12 footnote 1: \"Puget Equico is a wholly-owned subsidiary of Puget Intermediate\"; the footnote's as-of date is February 19, 2026",
        "note": "\"Wholly-owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:curated:puget-intermediate-holdings-inc",
         "name": "Puget Intermediate Holdings Inc."
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-intermediate-holdings-inc",
         "name": "Puget Intermediate Holdings Inc."
        },
        "cumulative_share": 0.25,
        "depth": 4,
        "effective_date": "2026-02-19",
        "effective_date_basis": "stated",
        "exposure_evidence": "reported",
        "exposure_method": "derived",
        "exposure_mw": 205.925,
        "locator": "Part III Item 12 footnote 1: \"Puget Intermediate is a wholly-owned subsidiary of Puget Holdings and the Investors are the direct or indirect owners of Puget Holdings\"",
        "note": "\"Wholly-owned\" is read as a stated share of 1.0",
        "parent": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "relation": "wholly_owned_subsidiary",
        "reviewer": "claude-w65",
        "share": 1.0,
        "share_evidence": "reported",
        "share_method": "curated",
        "share_reason": null,
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1: \"Puget Holdings is owned by a consortium of long-term infrastructure investors including the British Columbia Investment Management Corporation (BCIMC), the Alberta Investment Management Corporation (AIMCo), Ontario Municipal Employee Retirement System (OMERS), PGGM Vermogensbeheer B.V., Macquarie Washington Clean Energy Investment, L.P., and the Ontario Teachers' Pension Plan Board\"; Item 12 footnote 1 cites Schedule 13D/A of February 13, 2009",
        "note": "No percentage is stated in the 10-K and the list is introduced with \"including\"; the MW attributed to Puget Holdings is not split further",
        "parent": {
         "id": "org:curated:bci",
         "name": "British Columbia Investment Management Corporation"
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row); Item 12 footnote 1 names PIP2PX (Pad) Ltd. and PIP2GV (Pad) Ltd., Edmonton, among the Investors",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:aimco",
         "name": "Alberta Investment Management Corporation"
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row); Item 12 footnote 1 lists OMERS among the Investors",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:omers",
         "name": "Ontario Municipal Employees Retirement System"
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row); Item 12 footnote 1 lists PGGM among the Investors",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:pggm",
         "name": "PGGM Vermogensbeheer B.V."
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row)",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:macquarie-washington-clean-energy-investment-lp",
         "name": "Macquarie Washington Clean Energy Investment, L.P."
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       },
       {
        "checked": "2026-09-21",
        "child": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "cumulative_share": null,
        "depth": 5,
        "effective_date": "2025-12-31",
        "effective_date_basis": "fiscal_year_end",
        "exposure_evidence": null,
        "exposure_method": null,
        "exposure_mw": null,
        "locator": "Part I Item 1 consortium sentence (see the BCI row)",
        "note": "No percentage stated",
        "parent": {
         "id": "org:curated:ontario-teachers-pension-plan-board",
         "name": "Ontario Teachers' Pension Plan Board"
        },
        "relation": "fund_managed",
        "reviewer": "claude-w65",
        "share": null,
        "share_evidence": null,
        "share_method": "curated",
        "share_reason": "share_not_stated_in_source",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm"
       }
      ],
      "owned_mw": 205.925,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:15500",
       "name": "Puget Sound Energy"
      },
      "share": 0.25,
      "terminals": [
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:bci",
         "name": "British Columbia Investment Management Corporation"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:aimco",
         "name": "Alberta Investment Management Corporation"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:omers",
         "name": "Ontario Municipal Employees Retirement System"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:pggm",
         "name": "PGGM Vermogensbeheer B.V."
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:macquarie-washington-clean-energy-investment-lp",
         "name": "Macquarie Washington Clean Energy Investment, L.P."
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": null,
        "depth": 5,
        "entity": {
         "id": "org:curated:ontario-teachers-pension-plan-board",
         "name": "Ontario Teachers' Pension Plan Board"
        },
        "exposure_mw": null,
        "exposure_reason": "unstated_hop_below",
        "kind": "curation_ends",
        "locator": null,
        "note": "No parent row is curated above this entity; whether one exists is not established",
        "source_url": null
       },
       {
        "cumulative_share": 0.25,
        "depth": 4,
        "entity": {
         "id": "org:curated:puget-holdings-llc",
         "name": "Puget Holdings LLC"
        },
        "exposure_mw": 205.925,
        "kind": "share_not_stated",
        "locator": "Part I Item 1: \"Puget Holdings is owned by a consortium of long-term infrastructure investors including the British Columbia Investment Management Corporation (BCIMC), the Alberta Investment Management Corporation (AIMCo), Ontario Municipal Employee Retirement System (OMERS), PGGM Vermogensbeheer B.V., Macquarie Washington Clean Energy Investment, L.P., and the Ontario Teachers' Pension Plan Board\"; Item 12 footnote 1 cites Schedule 13D/A of February 13, 2009",
        "note": "The filing states these parents without a share; the MW stays attributed here and is not split among them",
        "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm",
        "unresolved_parents": [
         {
          "id": "org:curated:bci",
          "name": "British Columbia Investment Management Corporation",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:aimco",
          "name": "Alberta Investment Management Corporation",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:omers",
          "name": "Ontario Municipal Employees Retirement System",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:pggm",
          "name": "PGGM Vermogensbeheer B.V.",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:macquarie-washington-clean-energy-investment-lp",
          "name": "Macquarie Washington Clean Energy Investment, L.P.",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         },
         {
          "id": "org:curated:ontario-teachers-pension-plan-board",
          "name": "Ontario Teachers' Pension Plan Board",
          "relation": "fund_managed",
          "share_reason": "share_not_stated_in_source"
         }
        ]
       }
      ],
      "unnamed_remainders": []
     },
     {
      "all_hops_stated": true,
      "curated": true,
      "exposure_evidence": "reported",
      "hops": [],
      "owned_mw": 123.555,
      "owner": {
       "entity_type": "I",
       "entity_type_label": "Investor-owned utility",
       "id": "org:eia:20169",
       "name": "Avista"
      },
      "share": 0.15,
      "terminals": [
       {
        "cumulative_share": 0.15,
        "depth": 0,
        "entity": {
         "id": "org:eia:20169",
         "name": "Avista Corporation"
        },
        "exposure_mw": 123.555,
        "exposure_reason": null,
        "kind": "publicly_held",
        "locator": "Avista Corporation Form 10-K for FY2025 (filed 2026-02-25), cover page: common stock, trading symbol AVA, New York Stock Exchange; Exhibit 21 lists Avista's own subsidiaries and no parent",
        "note": "Item 7 (Colstrip): \"We previously held a 15 percent interest in Units 3 and 4 of Colstrip\" and \"On January 1, 2026, the Company transferred its ownership in Colstrip to NorthWestern\"; recorded in ownership_transfers.csv. Beneficial owners above 5 percent are in the proxy statement and are not curated",
        "source_url": "https://www.sec.gov/Archives/edgar/data/104918/000119312526067872/ava-20251231.htm"
       }
      ],
      "unnamed_remainders": []
     }
    ],
    "generator_id": "4",
    "invalid_shares": false,
    "ownership_basis": "reported_schedule",
    "residual_components": {
     "direct_unassigned_mw": 0.0,
     "direct_unknown_mw": 0.0,
     "unnamed_remainder_mw": 0.0
    },
    "status": "OP",
    "unknown_reason": null,
    "unknown_residual_mw": 0.0
   }
  ],
  "grain": "generator",
  "id_schemes": {
   "org:curated": "Minted slug for an entity with neither id; no entity file in this release",
   "org:eia": "EIA utility id; an organization entity in this release",
   "org:sec": "SEC EDGAR Central Index Key; no entity file in this release"
  },
  "relations": {
   "fund_managed": "The parent is an investment fund, pension manager or fund vehicle; the share is as stated or null",
   "government": "The parent is a government or government body",
   "majority_owned": "The parent holds more than half of the child's equity, at the stated share",
   "minority_stake": "The parent holds less than half of the child's equity, at the stated share",
   "publicly_held": "The child's shares trade on a named exchange; the chain ends here. Holders above 5 percent are in the proxy statement and not curated",
   "subsidiary": "The filing states control (a subsidiary) without a percentage; the share is null and the MW is not carried up",
   "wholly_owned_subsidiary": "The parent holds all of the child's equity, as the filing states"
  },
  "residual_components": {
   "direct_unassigned_mw": 0.0,
   "direct_unknown_mw": 0.0,
   "unnamed_remainder_mw": 0.0
  },
  "review_note": "Direct owners of the operating units in the 2024 inventory (EIA-860 Schedule 4): Talen Montana (30 percent of Unit 3), Puget Sound Energy (25 percent of Units 3 and 4), Portland General Electric (20 percent of both), Avista (15 percent of both), PacifiCorp (10 percent of both), NorthWestern Energy (30 percent of Unit 4). Each owner's FY2025 Form 10-K states the same interest (PGE 20 percent of Units 3 and 4; Talen Montana 30 percent of Unit 3; Avista 15 percent of Units 3 and 4 until 2026-01-01). Units 1 and 2 are retired (January 2020) and carry no operating MW. Talen Montana operates the plant; the operator role is not an ownership share",
  "reviewer": "claude-w65",
  "roles": {
   "note": "The operator runs the plant; owners hold shares of its units; a parent holds shares of an owner. None of these is a wire to a customer.",
   "operator": {
    "entity_type": "Q",
    "entity_type_label": "Independent power producer",
    "id": "org:eia:15298",
    "name": "Talen Montana"
   },
   "owners": [
    {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:15500",
     "name": "Puget Sound Energy"
    },
    {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:15248",
     "name": "Portland General Electric"
    },
    {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:13902",
     "name": "NorthWestern Energy"
    },
    {
     "entity_type": "Q",
     "entity_type_label": "Independent power producer",
     "id": "org:eia:15298",
     "name": "Talen Montana"
    },
    {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:20169",
     "name": "Avista"
    },
    {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:14354",
     "name": "PacifiCorp"
    }
   ],
   "retail_suppliers": {
    "contract": "docs/entities.md#3-relationships-and-observations",
    "derivable": false,
    "note": "Who sells this plant's output to customers is a supply relationship (a contract, a portfolio claim or a disclosure), not an ownership share; an owner may sell its share wholesale, and a utility may serve customers from plants it does not own. Filed claims on this plant's output, where Washington's fuel-mix disclosure has any, appear in their own section.",
    "reason": "not_derivable_from_ownership"
   }
  },
  "source_ref": "ownership-parents",
  "top_level": [
   {
    "entity": {
     "id": "org:curated:puget-holdings-llc",
     "name": "Puget Holdings LLC"
    },
    "exposure": {
     "basis": "Sum over a plant's operating generators of nameplate MW x the direct owner's share x each stated hop share up the curated chain to this entity; computed only while every hop is stated; a share of the same physical MW as the direct owner's owned MW, never added to it",
     "coverage": null,
     "denominator": null,
     "evidence": "reported",
     "fact_id": "plant:eia:6076/parent/org:curated:puget-holdings-llc#ownership_exposure_mw@2024",
     "label": "Parent-attributed exposure",
     "locator": "derived: sum over operating generators of nameplate MW x direct share x each stated hop share up to org:curated:puget-holdings-llc; Part I Item 1: \"Puget Holdings is owned by a consortium of long-term infrastructure investors including the British Columbia Investment Management Corporation (BCIMC), the Alberta Investment Management Corporation (AIMCo), Ontario Municipal Employee Retirement System (OMERS), PGGM Vermogensbeheer B.V., Macquarie Washington Clean Energy Investment, L.P., and the Ontario Teachers' Pension Plan Board\"; Item 12 footnote 1 cites Schedule 13D/A of February 13, 2009",
     "maturity": "final",
     "method": "derived",
     "metric": "ownership_exposure_mw",
     "missing_reason": null,
     "note": "Stated up to this entity; the filing names parents above it without shares, so the MW is not split further",
     "period": {
      "kind": "inventory_year",
      "note": "EIA-860 annual inventory; status as of the end of the reporting year",
      "report_date": "2024-01-01",
      "year": 2024
     },
     "precision": 1,
     "quality": "valid",
     "source_ref": "ownership-parents",
     "unit": "MW",
     "value": 411.85
    },
    "generators": [
     "3",
     "4"
    ],
    "kind": "share_not_stated",
    "locator": "Part I Item 1: \"Puget Holdings is owned by a consortium of long-term infrastructure investors including the British Columbia Investment Management Corporation (BCIMC), the Alberta Investment Management Corporation (AIMCo), Ontario Municipal Employee Retirement System (OMERS), PGGM Vermogensbeheer B.V., Macquarie Washington Clean Energy Investment, L.P., and the Ontario Teachers' Pension Plan Board\"; Item 12 footnote 1 cites Schedule 13D/A of February 13, 2009",
    "note": "The filing states these parents without a share; the MW stays attributed here and is not split among them",
    "source_url": "https://www.sec.gov/Archives/edgar/data/1085392/000108539226000008/psd-20251231.htm",
    "unresolved_parents": [
     {
      "id": "org:curated:bci",
      "name": "British Columbia Investment Management Corporation",
      "relation": "fund_managed",
      "share_reason": "share_not_stated_in_source"
     },
     {
      "id": "org:curated:aimco",
      "name": "Alberta Investment Management Corporation",
      "relation": "fund_managed",
      "share_reason": "share_not_stated_in_source"
     },
     {
      "id": "org:curated:omers",
      "name": "Ontario Municipal Employees Retirement System",
      "relation": "fund_managed",
      "share_reason": "share_not_stated_in_source"
     },
     {
      "id": "org:curated:pggm",
      "name": "PGGM Vermogensbeheer B.V.",
      "relation": "fund_managed",
      "share_reason": "share_not_stated_in_source"
     },
     {
      "id": "org:curated:macquarie-washington-clean-energy-investment-lp",
      "name": "Macquarie Washington Clean Energy Investment, L.P.",
      "relation": "fund_managed",
      "share_reason": "share_not_stated_in_source"
     },
     {
      "id": "org:curated:ontario-teachers-pension-plan-board",
      "name": "Ontario Teachers' Pension Plan Board",
      "relation": "fund_managed",
      "share_reason": "share_not_stated_in_source"
     }
    ],
    "via_direct_owners": [
     "org:eia:15500"
    ]
   },
   {
    "entity": {
     "id": "org:eia:15248",
     "name": "Portland General Electric Company"
    },
    "exposure": {
     "basis": "Sum over a plant's operating generators of nameplate MW x the direct owner's share x each stated hop share up the curated chain to this entity; computed only while every hop is stated; a share of the same physical MW as the direct owner's owned MW, never added to it",
     "coverage": null,
     "denominator": null,
     "evidence": "reported",
     "fact_id": "plant:eia:6076/parent/org:eia:15248#ownership_exposure_mw@2024",
     "label": "Parent-attributed exposure",
     "locator": "derived: sum over operating generators of nameplate MW x direct share x each stated hop share up to org:eia:15248; Portland General Electric Form 10-K for FY2025 (filed 2026-02-17), cover page: common stock registered under Section 12(b), trading symbol POR, New York Stock Exchange; Item 1: \"The Company also has a 20% ownership interest in the Colstrip Units 3 and 4 coal-fired generating plant\", operated by a third party",
     "maturity": "final",
     "method": "derived",
     "metric": "ownership_exposure_mw",
     "missing_reason": null,
     "note": null,
     "period": {
      "kind": "inventory_year",
      "note": "EIA-860 annual inventory; status as of the end of the reporting year",
      "report_date": "2024-01-01",
      "year": 2024
     },
     "precision": 1,
     "quality": "valid",
     "source_ref": "ownership-parents",
     "unit": "MW",
     "value": 329.48
    },
    "generators": [
     "3",
     "4"
    ],
    "kind": "publicly_held",
    "locator": "Portland General Electric Form 10-K for FY2025 (filed 2026-02-17), cover page: common stock registered under Section 12(b), trading symbol POR, New York Stock Exchange; Item 1: \"The Company also has a 20% ownership interest in the Colstrip Units 3 and 4 coal-fired generating plant\", operated by a third party",
    "note": "No holding company above the utility on the filing date: Item 7 records an application to the OPUC on July 25, 2025 for a holding-company reorganization, pending. Beneficial owners above 5 percent are in the proxy statement and are not curated",
    "source_url": "https://www.sec.gov/Archives/edgar/data/784977/000119312526052750/por-20251231.htm",
    "unresolved_parents": null,
    "via_direct_owners": [
     "org:eia:15248"
    ]
   },
   {
    "entity": {
     "id": "org:eia:15298",
     "name": "Talen Montana, LLC"
    },
    "exposure": {
     "basis": "Sum over a plant's operating generators of nameplate MW x the direct owner's share x each stated hop share up the curated chain to this entity; computed only while every hop is stated; a share of the same physical MW as the direct owner's owned MW, never added to it",
     "coverage": null,
     "denominator": null,
     "evidence": "reported",
     "fact_id": "plant:eia:6076/parent/org:eia:15298#ownership_exposure_mw@2024",
     "label": "Parent-attributed exposure",
     "locator": "derived: sum over operating generators of nameplate MW x direct share x each stated hop share up to org:eia:15298; Talen Energy Corporation Form 10-K for FY2025 (filed 2026-02-26), Item 1: \"Talen Montana, LLC, a Talen subsidiary that operates Colstrip, owns an undivided interest in Colstrip Unit 3\"; \"Talen Energy Supply, LLC, a direct subsidiary of Talen Energy Corporation that, thorough subsidiaries, indirectly holds all of Talen's assets and operations\"; Exhibit 21.1 lists Talen Montana, LLC and Talen Montana Holdings, LLC (Delaware)",
     "maturity": "final",
     "method": "derived",
     "metric": "ownership_exposure_mw",
     "missing_reason": null,
     "note": "Stated up to this entity; the filing names parents above it without shares, so the MW is not split further",
     "period": {
      "kind": "inventory_year",
      "note": "EIA-860 annual inventory; status as of the end of the reporting year",
      "report_date": "2024-01-01",
      "year": 2024
     },
     "precision": 1,
     "quality": "valid",
     "source_ref": "ownership-parents",
     "unit": "MW",
     "value": 247.11
    },
    "generators": [
     "3"
    ],
    "kind": "share_not_stated",
    "locator": "Talen Energy Corporation Form 10-K for FY2025 (filed 2026-02-26), Item 1: \"Talen Montana, LLC, a Talen subsidiary that operates Colstrip, owns an undivided interest in Colstrip Unit 3\"; \"Talen Energy Supply, LLC, a direct subsidiary of Talen Energy Corporation that, thorough subsidiaries, indirectly holds all of Talen's assets and operations\"; Exhibit 21.1 lists Talen Montana, LLC and Talen Montana Holdings, LLC (Delaware)",
    "note": "The filing states these parents without a share; the MW stays attributed here and is not split among them",
    "source_url": "https://www.sec.gov/Archives/edgar/data/1622536/000162253626000017/tln-20251231.htm",
    "unresolved_parents": [
     {
      "id": "org:curated:talen-energy-supply-llc",
      "name": "Talen Energy Supply, LLC",
      "relation": "subsidiary",
      "share_reason": "share_not_stated_in_source"
     }
    ],
    "via_direct_owners": [
     "org:eia:15298"
    ]
   },
   {
    "entity": {
     "id": "org:eia:20169",
     "name": "Avista Corporation"
    },
    "exposure": {
     "basis": "Sum over a plant's operating generators of nameplate MW x the direct owner's share x each stated hop share up the curated chain to this entity; computed only while every hop is stated; a share of the same physical MW as the direct owner's owned MW, never added to it",
     "coverage": null,
     "denominator": null,
     "evidence": "reported",
     "fact_id": "plant:eia:6076/parent/org:eia:20169#ownership_exposure_mw@2024",
     "label": "Parent-attributed exposure",
     "locator": "derived: sum over operating generators of nameplate MW x direct share x each stated hop share up to org:eia:20169; Avista Corporation Form 10-K for FY2025 (filed 2026-02-25), cover page: common stock, trading symbol AVA, New York Stock Exchange; Exhibit 21 lists Avista's own subsidiaries and no parent",
     "maturity": "final",
     "method": "derived",
     "metric": "ownership_exposure_mw",
     "missing_reason": null,
     "note": null,
     "period": {
      "kind": "inventory_year",
      "note": "EIA-860 annual inventory; status as of the end of the reporting year",
      "report_date": "2024-01-01",
      "year": 2024
     },
     "precision": 1,
     "quality": "valid",
     "source_ref": "ownership-parents",
     "unit": "MW",
     "value": 247.11
    },
    "generators": [
     "3",
     "4"
    ],
    "kind": "publicly_held",
    "locator": "Avista Corporation Form 10-K for FY2025 (filed 2026-02-25), cover page: common stock, trading symbol AVA, New York Stock Exchange; Exhibit 21 lists Avista's own subsidiaries and no parent",
    "note": "Item 7 (Colstrip): \"We previously held a 15 percent interest in Units 3 and 4 of Colstrip\" and \"On January 1, 2026, the Company transferred its ownership in Colstrip to NorthWestern\"; recorded in ownership_transfers.csv. Beneficial owners above 5 percent are in the proxy statement and are not curated",
    "source_url": "https://www.sec.gov/Archives/edgar/data/104918/000119312526067872/ava-20251231.htm",
    "unresolved_parents": null,
    "via_direct_owners": [
     "org:eia:20169"
    ]
   },
   {
    "entity": {
     "id": "org:sec:1993004",
     "name": "NorthWestern Energy Group, Inc."
    },
    "exposure": {
     "basis": "Sum over a plant's operating generators of nameplate MW x the direct owner's share x each stated hop share up the curated chain to this entity; computed only while every hop is stated; a share of the same physical MW as the direct owner's owned MW, never added to it",
     "coverage": null,
     "denominator": null,
     "evidence": "reported",
     "fact_id": "plant:eia:6076/parent/org:sec:1993004#ownership_exposure_mw@2024",
     "label": "Parent-attributed exposure",
     "locator": "derived: sum over operating generators of nameplate MW x direct share x each stated hop share up to org:sec:1993004; Cover page: common stock, trading symbol NWE, Nasdaq Stock Market LLC; Item 1: \"as of January 1, 2026, we have a 55 percent ownership of Units 3 & 4\"",
     "maturity": "final",
     "method": "derived",
     "metric": "ownership_exposure_mw",
     "missing_reason": null,
     "note": null,
     "period": {
      "kind": "inventory_year",
      "note": "EIA-860 annual inventory; status as of the end of the reporting year",
      "report_date": "2024-01-01",
      "year": 2024
     },
     "precision": 1,
     "quality": "valid",
     "source_ref": "ownership-parents",
     "unit": "MW",
     "value": 247.11
    },
    "generators": [
     "4"
    ],
    "kind": "publicly_held",
    "locator": "Cover page: common stock, trading symbol NWE, Nasdaq Stock Market LLC; Item 1: \"as of January 1, 2026, we have a 55 percent ownership of Units 3 & 4\"",
    "note": "An all-stock merger of equals with Black Hills Corporation under the Agreement and Plan of Merger dated August 18, 2025 is pending on the filing date; the combined company is to be named Bright Horizon Energy Corporation. Not a change of parent until it closes. Beneficial owners above 5 percent are in the proxy statement and are not curated",
    "source_url": "https://www.sec.gov/Archives/edgar/data/1993004/000199300426000006/nweg-20251231.htm",
    "unresolved_parents": null,
    "via_direct_owners": [
     "org:eia:13902"
    ]
   },
   {
    "entity": {
     "id": "org:sec:1067983",
     "name": "Berkshire Hathaway Inc."
    },
    "exposure": {
     "basis": "Sum over a plant's operating generators of nameplate MW x the direct owner's share x each stated hop share up the curated chain to this entity; computed only while every hop is stated; a share of the same physical MW as the direct owner's owned MW, never added to it",
     "coverage": null,
     "denominator": null,
     "evidence": "reported",
     "fact_id": "plant:eia:6076/parent/org:sec:1067983#ownership_exposure_mw@2024",
     "label": "Parent-attributed exposure",
     "locator": "derived: sum over operating generators of nameplate MW x direct share x each stated hop share up to org:sec:1067983; Berkshire Hathaway Inc. Form 10-K for FY2025 (filed 2026-03-02), cover page: Class A and Class B common stock registered under Section 12(b) on the New York Stock Exchange; Item 1: \"a holding company owning subsidiaries engaged in numerous diverse business activities\"",
     "maturity": "final",
     "method": "derived",
     "metric": "ownership_exposure_mw",
     "missing_reason": null,
     "note": null,
     "period": {
      "kind": "inventory_year",
      "note": "EIA-860 annual inventory; status as of the end of the reporting year",
      "report_date": "2024-01-01",
      "year": 2024
     },
     "precision": 1,
     "quality": "valid",
     "source_ref": "ownership-parents",
     "unit": "MW",
     "value": 164.74
    },
    "generators": [
     "3",
     "4"
    ],
    "kind": "publicly_held",
    "locator": "Berkshire Hathaway Inc. Form 10-K for FY2025 (filed 2026-03-02), cover page: Class A and Class B common stock registered under Section 12(b) on the New York Stock Exchange; Item 1: \"a holding company owning subsidiaries engaged in numerous diverse business activities\"",
    "note": "Beneficial owners above 5 percent are in the proxy statement and are not curated",
    "source_url": "https://www.sec.gov/Archives/edgar/data/1067983/000119312526083899/brka-20251231.htm",
    "unresolved_parents": null,
    "via_direct_owners": [
     "org:eia:14354"
    ]
   }
  ],
  "unit": "MW",
  "unknown_residual": {
   "basis": "Operating nameplate MW minus the exposure reaching every terminal entity of the curated chains: direct capacity with no established owner, unassigned direct fractions, and remainders where stated parent shares sum below one with no holder named",
   "coverage": null,
   "denominator": null,
   "evidence": "reported",
   "fact_id": "plant:eia:6076#ownership_unknown_residual_mw@2024",
   "label": "Unknown residual",
   "locator": "derived: nameplate_mw_op - sum of exposure at every terminal entity",
   "maturity": "final",
   "method": "derived",
   "metric": "ownership_unknown_residual_mw",
   "missing_reason": null,
   "note": "Zero means every operating MW reaches a named entity at the top of a stated chain; components say where any remainder comes from",
   "period": {
    "kind": "inventory_year",
    "note": "EIA-860 annual inventory; status as of the end of the reporting year",
    "report_date": "2024-01-01",
    "year": 2024
   },
   "precision": 1,
   "quality": "valid",
   "source_ref": "ownership-parents",
   "unit": "MW",
   "value": 0.0
  }
 },
 "ownership_rollup": {
  "basis": "Operating nameplate MW x ownership fraction, once per generator; reported schedule or EIA-860 schedule-4 default",
  "note": null,
  "owners": [
   {
    "bases": [
     "reported_schedule"
    ],
    "generators": 2,
    "owned_mw": 411.85,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:15500",
     "name": "Puget Sound Energy"
    }
   },
   {
    "bases": [
     "reported_schedule"
    ],
    "generators": 2,
    "owned_mw": 329.48,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:15248",
     "name": "Portland General Electric"
    }
   },
   {
    "bases": [
     "reported_schedule"
    ],
    "generators": 1,
    "owned_mw": 247.11,
    "owner": {
     "entity_type": "Q",
     "entity_type_label": "Independent power producer",
     "id": "org:eia:15298",
     "name": "Talen Montana"
    }
   },
   {
    "bases": [
     "reported_schedule"
    ],
    "generators": 2,
    "owned_mw": 247.11,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:20169",
     "name": "Avista"
    }
   },
   {
    "bases": [
     "reported_schedule"
    ],
    "generators": 1,
    "owned_mw": 247.11,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:13902",
     "name": "NorthWestern Energy"
    }
   },
   {
    "bases": [
     "reported_schedule"
    ],
    "generators": 2,
    "owned_mw": 164.74,
    "owner": {
     "entity_type": "I",
     "entity_type_label": "Investor-owned utility",
     "id": "org:eia:14354",
     "name": "PacifiCorp"
    }
   }
  ],
  "unassigned_mw": 0.0,
  "unknown_coverage": {
   "eligible": 0,
   "included": 0,
   "unit": "native rows"
  },
  "unknown_mw": 0.0
 },
 "release_id": "20260929T050546Z-51ae0f7d3c78",
 "reporting": {
  "ba": {
   "code": "NWMT",
   "id": "ba:eia:NWMT",
   "name": "NorthWestern Energy"
  },
  "ba_code_source": "NWMT",
  "frame_role": "ring",
  "in_geographic_core": true,
  "in_reporting_frame": true,
  "inclusion_reason": "ba_in_frame_v1",
  "membership_review_status": "source",
  "reporter_frequency": "M"
 },
 "resource_group": "coal",
 "schema_version": "1.41.0",
 "source_name": "Colstrip",
 "sources": [
  "curated-aliases",
  "ownership-parents",
  "pudl-epa-eia-crosswalk",
  "pudl-epacems",
  "pudl-generators",
  "pudl-output",
  "pudl-ownership",
  "pudl-plants"
 ],
 "storage": null,
 "type": "plant",
 "updated_reason": null,
 "water": null
}