{ "aliases": [ { "relation": "exact", "review_state": "source", "source_entity_id": "56908", "source_ref": "pudl-plants" } ], "citation_path": "citations/plant~eia~56908.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": 0.0, "id": "line:hifld:202776", "name": "NORTHWESTERN ENERGY LLC - (MT) line 202776", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "115-161", "voltage_kv": 115.0 }, { "distance_km": 0.0, "id": "line:hifld:202778", "name": "MILL CREEK GENERATING STATION – DILLON-SALMON", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "115-161", "voltage_kv": 115.0 }, { "distance_km": 0.0, "id": "line:hifld:202777", "name": "NORTHWESTERN ENERGY LLC - (MT) line 202777", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "115-161", "voltage_kv": 115.0 }, { "distance_km": 0.0, "id": "line:hifld:202329", "name": "NORTHWESTERN ENERGY LLC - (MT) line 202329", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "115-161", "voltage_kv": 115.0 }, { "distance_km": 0.01, "id": "line:hifld:202353", "name": "RATTLESNAKE – MILL CREEK GENERATING STATION", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "230", "voltage_kv": 230.0 }, { "distance_km": 0.02, "id": "line:hifld:201412", "name": "GARRISON – MILL CREEK GENERATING STATION", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "230", "voltage_kv": 230.0 }, { "distance_km": 0.02, "id": "line:hifld:201413", "name": "MILL CREEK GENERATING STATION – AMPS", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "230", "voltage_kv": 230.0 }, { "distance_km": 0.02, "id": "line:hifld:201417", "name": "THREE RIVERS – MILL CREEK GENERATING STATION", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "230", "voltage_kv": 230.0 }, { "distance_km": 0.02, "id": "line:hifld:202248", "name": "ANACONDA – MILL CREEK GENERATING STATION", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "115-161", "voltage_kv": 115.0 }, { "distance_km": 0.02, "id": "line:hifld:206802", "name": "DAVE GATES GENERATING STATION – MILL CREEK GENERATING STATION", "source_ref": "hifld-lines-2021", "type": "line", "voltage_class": "230", "voltage_kv": 230.0 } ], "nearby_substations": [ { "distance_km": 0.02, "id": "substation:hifld:201556", "kind": "SUBSTATION", "max_kv": 230.0, "name": "MILL CREEK GENERATING STATION", "source_ref": "hifld-substations-2022", "type": "substation" }, { "distance_km": 0.56, "id": "substation:hifld:201060", "kind": "SUBSTATION", "max_kv": 230.0, "name": "ANACONDA", "source_ref": "hifld-substations-2022", "type": "substation" } ], "territories": [] }, "coverage": { "generators_eligible": 3, "generators_operating": 3, "generators_published": 3, "output_years": [ 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 ], "ownership_known_generators": 3 }, "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": [], "source_ref": "wa-fmd-2024-by-plant" }, "emissions": { "all_units_monitored": true, "available": true, "combustion_mw": 203.10000000000002, "combustion_mw_monitored": 203.10000000000002, "conversion": { "short_tons_to_tonnes": 0.90718474 }, "crosswalk_source_ref": "pudl-epa-eia-crosswalk", "crosswalk_year": 2024, "evidence": "metered", "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": 3, "included": 3, "unit": "combustion generators" }, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#co2_mass_tonnes@2024", "label": "CO2 mass, monitored units", "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "co2_mass_tonnes", "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": "t CO2", "value": 286945.2874748702 }, { "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": 3, "included": 3, "unit": "combustion generators" }, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#co2_mass_short_tons@2024", "label": "CO2 mass, monitored units, as filed", "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=56908", "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": 316303.0359999995 }, { "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": "metered", "fact_id": "plant:eia:56908#cems_gross_load_mwh@2024", "label": "Gross load of monitored units", "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=56908", "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": 491421.67000000004 }, { "basis": "Sum over the year of each monitored unit's reported hourly heat input", "coverage": null, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#cems_heat_input_mmbtu@2024", "label": "Heat input of monitored units", "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=56908", "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": 5297423.3730000025 }, { "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": 6, "included": 6, "unit": "monitored units" }, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#cems_unit_operating_hours@2024", "label": "Unit operating hours, monitored units", "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=56908", "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": 24355.34 }, { "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:56908#cems_hours_with_operation@2024", "label": "Hours in which a monitored unit ran", "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=56908", "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": 8783.0 }, { "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:56908#cems_units_monitored@2024", "label": "EPA emissions units with CEMS rows", "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=56908", "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": 6.0 }, { "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:56908#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=56908", "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": 3.0 }, { "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:56908#cems_generators_total@2024", "label": "Combustion generators at the plant", "locator": "out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=56908", "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": 3.0 }, { "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": 25148, "included": 25148, "unit": "operating unit-hours" }, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#cems_measured_share@2024", "label": "Share of operating unit-hours with measured CO2", "locator": "core_epacems__hourly_emissions.parquet; year=2024; plant_id_eia=56908", "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": 1.0 }, { "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": 474696.0 }, "evidence": "metered", "fact_id": "plant:eia:56908#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": 0.6044822106671853 }, { "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": 491421.67000000004 }, "evidence": "metered", "fact_id": "plant:eia:56908#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": 0.5839084944603078 } ], "generators_monitored": 3, "generators_monitored_other": 0, "generators_total": 3, "generators_unmonitored": null, "history": [ { "all_units_monitored": true, "available": true, "combustion_mw": 203.10000000000002, "combustion_mw_monitored": 203.10000000000002, "conversion": { "short_tons_to_tonnes": 0.90718474 }, "crosswalk_source_ref": "pudl-epa-eia-crosswalk", "crosswalk_year": 2023, "evidence": "metered", "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": 3, "included": 3, "unit": "combustion generators" }, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#co2_mass_tonnes@2023", "label": "CO2 mass, monitored units", "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "co2_mass_tonnes", "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": "t CO2", "value": 327368.60034338606 }, { "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": 3, "included": 3, "unit": "combustion generators" }, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#co2_mass_short_tons@2023", "label": "CO2 mass, monitored units, as filed", "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=56908", "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": 360862.1109999999 }, { "basis": "Sum over the year of each monitored unit's reported hourly gross load (MW) x operating time (h). 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year=2023; plant_id_eia=56908", "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": 6072135.020000002 }, { "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": 6, "included": 6, "unit": "monitored units" }, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#cems_unit_operating_hours@2023", "label": "Unit operating hours, monitored units", "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=56908", "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": 28108.440000000002 }, { "basis": "Calendar hours of the reporting year in which at least one monitored unit reported operating time; 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report_date=2023-01-01; plant_id_eia=56908", "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": 3.0 }, { "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": 28826, "included": 28823, "unit": "operating unit-hours" }, "denominator": null, "evidence": "metered", "fact_id": "plant:eia:56908#cems_measured_share@2023", "label": "Share of operating unit-hours with measured CO2", "locator": "core_epacems__hourly_emissions.parquet; year=2023; plant_id_eia=56908", "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": 0.9998959272878651 }, { "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": 547467.0000000001 }, "evidence": "metered", "fact_id": "plant:eia:56908#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": 0.5979695586097171 }, { "basis": "Monitored-unit CO2 (tonnes) divided by the same units' reported gross load. 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report_date=2024-01-01; plant_id_eia=56908; generator_id=2", "maturity": "final", "method": "derived", "metric": "winter_capacity_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": "pudl-generators", "unit": "MW", "value": 48.1 } ], "generator_id": "2", "id": "generator:eia:56908:2", "is_storage": false, "operator": { "entity_type": "I", "entity_type_label": "Investor-owned utility", "id": "org:eia:56815", "name": "NorthWestern Energy" }, "ownership": { "basis": "eia860_schedule4_default", "invalid_shares": false, "note": null, "shares": [ { "basis": "eia860_schedule4_default", "evidence": "reported", "fraction": 1.0, "locator": "out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=56908; generator_id=2; ownership_code=S; rule=eia860_schedule4_default", "method": "derived", "owned_mw": 67.7, "owner": { "entity_type": "I", "entity_type_label": "Investor-owned utility", "id": "org:eia:56815", "name": "NorthWestern Energy" }, "reason": "eia860_schedule4_default", "source_ref": "pudl-generators" } ], "unassigned_fraction": 0.0, "unassigned_mw": 0.0, "unknown_reason": null }, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" }, "resource_group": "gas", "status": { "category": "existing", "code": "OP", "label": "operating" }, "storage": null, "technology": "Natural Gas Fired Combustion Turbine" }, { "dates": { "note": "EIA-860 reports month and year; 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report_date=2024-01-01; plant_id_eia=56908; generator_id=3; ownership_code=S; rule=eia860_schedule4_default", "method": "derived", "owned_mw": 67.7, "owner": { "entity_type": "I", "entity_type_label": "Investor-owned utility", "id": "org:eia:56815", "name": "NorthWestern Energy" }, "reason": "eia860_schedule4_default", "source_ref": "pudl-generators" } ], "unassigned_fraction": 0.0, "unassigned_mw": 0.0, "unknown_reason": null }, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" }, "resource_group": "gas", "status": { "category": "existing", "code": "OP", "label": "operating" }, "storage": null, "technology": "Natural Gas Fired Combustion Turbine" } ], "id": "plant:eia:56908", "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": 3, "included": 3, "unit": "current and historical generators", "unknown_current_state": 0 }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#latest_nameplate_mw_op", "label": "Operating nameplate capacity, latest inventory", "locator": "Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=56908; 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": 203.10000000000002 }, { "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": 3, "included": 3, "unit": "current and historical generators" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#latest_nameplate_mw_planned", "label": "Planned nameplate capacity, latest inventory", "locator": "Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=56908; 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": 3, "included": 3, "unit": "current and historical generators" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#latest_nameplate_mw_retired", "label": "Retired or cancelled nameplate capacity, latest inventory", "locator": "Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=56908; report_date=2026-08-01", "maturity": "provisional", "method": "derived", "metric": "latest_nameplate_mw_retired", "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 } ], "historical_units": [], "in_baseline": true, "last_retirement_date": null, "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": 67.7, "changed_on": "2026-08-01", "dates": { "operating": "2011-01-01", "planned_operating": null, "planned_retirement": null, "precision": "month", "retirement": null }, "generator_id": "1", "id": "generator:eia:56908:1", "in_baseline": true, "life": "operating", "resource_group": "gas", "status": { "category": "existing", "code": "OP", "label": "operating" }, "technology": "Natural Gas Fired Combustion Turbine" }, { "capacity_mw": 67.7, "changed_on": "2026-08-01", "dates": { "operating": "2011-01-01", "planned_operating": null, "planned_retirement": null, "precision": "month", "retirement": null }, "generator_id": "2", "id": "generator:eia:56908:2", "in_baseline": true, "life": "operating", "resource_group": "gas", "status": { "category": "existing", "code": "OP", "label": "operating" }, "technology": "Natural Gas Fired Combustion Turbine" }, { "capacity_mw": 67.7, "changed_on": "2026-08-01", "dates": { "operating": "2011-01-01", "planned_operating": null, "planned_retirement": null, "precision": "month", "retirement": null }, "generator_id": "3", "id": "generator:eia:56908:3", "in_baseline": true, "life": "operating", "resource_group": "gas", "status": { "category": "existing", "code": "OP", "label": "operating" }, "technology": "Natural Gas Fired Combustion Turbine" } ] }, "location": { "city": "Anaconda", "county": "Deer Lodge", "datum": null, "lat": 46.104713, "locator": "out_eia__yearly_plants.parquet; report_date=2024-01-01; plant_id_eia=56908", "lon": -112.876605, "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": "Dave Gates Generating Station", "operator": { "entity_type": "I", "entity_type_label": "Investor-owned utility", "id": "org:eia:56815", "name": "NorthWestern Energy" }, "output": { "annual": [ { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 85.18299999999999, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 427622.81700000004, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2015", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2015-01-01; plant_id_eia=56908", "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": 427708.00000000006 }, "rows": 2, "year": 2015 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 143.47400000000002, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 262777.526, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2016", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2016-01-01; plant_id_eia=56908", "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": 262921.0 }, "rows": 2, "year": 2016 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 69.541, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 251203.459, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2017", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2017-01-01; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "net_generation_mwh", "missing_reason": null, "note": null, "period": { "hours": 8760, "kind": "calendar_year", "period_end": "2018-01-01T00:00:00Z", "period_start": "2017-01-01T00:00:00Z", "year": 2017 }, "precision": 0, "quality": "valid", "source_ref": "pudl-output", "unit": "MWh", "value": 251273.0 }, "rows": 2, "year": 2017 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 15.735999999999999, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 220841.26400000002, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2018", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2018-01-01; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "net_generation_mwh", "missing_reason": null, "note": null, "period": { "hours": 8760, "kind": "calendar_year", "period_end": "2019-01-01T00:00:00Z", "period_start": "2018-01-01T00:00:00Z", "year": 2018 }, "precision": 0, "quality": "valid", "source_ref": "pudl-output", "unit": "MWh", "value": 220857.00000000003 }, "rows": 2, "year": 2018 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 1290.014, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 225451.986, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2019", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2019-01-01; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "net_generation_mwh", "missing_reason": null, "note": null, "period": { "hours": 8760, "kind": "calendar_year", "period_end": "2020-01-01T00:00:00Z", "period_start": "2019-01-01T00:00:00Z", "year": 2019 }, "precision": 0, "quality": "valid", "source_ref": "pudl-output", "unit": "MWh", "value": 226742.0 }, "rows": 2, "year": 2019 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 22.416, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 179299.58399999997, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2020", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2020-01-01; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "net_generation_mwh", "missing_reason": null, "note": null, "period": { "hours": 8784, "kind": "calendar_year", "period_end": "2021-01-01T00:00:00Z", "period_start": "2020-01-01T00:00:00Z", "year": 2020 }, "precision": 0, "quality": "valid", "source_ref": "pudl-output", "unit": "MWh", "value": 179321.99999999997 }, "rows": 2, "year": 2020 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 84.811, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 263571.189, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2021", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2021-01-01; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "net_generation_mwh", "missing_reason": null, "note": null, "period": { "hours": 8760, "kind": "calendar_year", "period_end": "2022-01-01T00:00:00Z", "period_start": "2021-01-01T00:00:00Z", "year": 2021 }, "precision": 0, "quality": "valid", "source_ref": "pudl-output", "unit": "MWh", "value": 263656.0 }, "rows": 2, "year": 2021 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 4019.525, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 401999.475, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2022", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2022-01-01; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "net_generation_mwh", "missing_reason": null, "note": null, "period": { "hours": 8760, "kind": "calendar_year", "period_end": "2023-01-01T00:00:00Z", "period_start": "2022-01-01T00:00:00Z", "year": 2022 }, "precision": 0, "quality": "valid", "source_ref": "pudl-output", "unit": "MWh", "value": 406019.0 }, "rows": 2, "year": 2022 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 4.734, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 547462.2660000001, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2023", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2023-01-01; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "net_generation_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-output", "unit": "MWh", "value": 547467.0000000001 }, "rows": 2, "year": 2023 }, { "components": [ { "energy_source": { "code": "DFO", "fuel_group": "oil", "label": "distillate_fuel_oil" }, "maturity": "final", "net_generation_mwh": 6196.283, "prime_mover": { "code": "GT", "label": "gas_combustion_turbine" } }, { "energy_source": { "code": "NG", "fuel_group": "gas", "label": "natural_gas" }, "maturity": "final", "net_generation_mwh": 468499.717, "prime_mover": { "code": "GT", "label": "gas_combustion_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": 2, "included": 2, "unit": "plant x prime-mover x fuel rows" }, "denominator": null, "evidence": "reported", "fact_id": "plant:eia:56908#net_generation_mwh@2024", "label": "Net generation", "locator": "out_eia923__yearly_generation_fuel_combined.parquet; report_date=2024-01-01; plant_id_eia=56908", "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": 474696.0 }, "rows": 2, "year": 2024 } ], "monthly": { "available": true, "basis": "Sum of unique plant x prime-mover x fuel rows per month; local calendar months as published by EIA; only years in which the respondent reported monthly (M) or monthly values once per year (AM)", "evidence": "reported", "frequency_sources": { "2017": "pudl-plants", "2018": "pudl-plants", "2019": "pudl-plants", "2020": "pudl-plants", "2021": "pudl-plants", "2022": "pudl-plants", "2023": "pudl-plants", "2024": "pudl-plants" }, "label": "Net generation, monthly", "locator": "out_eia923__monthly_generation_fuel_combined.parquet; plant_id_eia=56908", "maturity": "final", "method": "derived", "metric": "net_generation_mwh", "note": "Missing months absent, not zero; negative values retained; excluded years listed with reason", "period_kind": "calendar_month", "series_id": "plant:eia:56908#net_generation_mwh/monthly", "source_ref": "pudl-output-monthly", "unit": "MWh", "values": [ { "hours": 744, "maturity": "final", "period_end": "2017-02-01T00:00:00Z", "period_start": "2017-01-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 19641.0 }, { "hours": 672, "maturity": "final", "period_end": "2017-03-01T00:00:00Z", "period_start": "2017-02-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 16411.0 }, { "hours": 744, "maturity": "final", "period_end": "2017-04-01T00:00:00Z", "period_start": "2017-03-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 18953.0 }, { "hours": 720, "maturity": "final", "period_end": "2017-05-01T00:00:00Z", "period_start": "2017-04-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 19378.0 }, { "hours": 744, "maturity": "final", "period_end": "2017-06-01T00:00:00Z", "period_start": "2017-05-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 19242.0 }, { "hours": 720, "maturity": "final", "period_end": "2017-07-01T00:00:00Z", "period_start": "2017-06-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 18229.0 }, { "hours": 744, "maturity": "final", "period_end": "2017-08-01T00:00:00Z", "period_start": "2017-07-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 24780.0 }, { "hours": 744, "maturity": "final", "period_end": "2017-09-01T00:00:00Z", "period_start": "2017-08-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 31943.0 }, { "hours": 720, "maturity": "final", "period_end": "2017-10-01T00:00:00Z", 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"period_start": "2024-03-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 28225.0 }, { "hours": 720, "maturity": "final", "period_end": "2024-05-01T00:00:00Z", "period_start": "2024-04-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 28555.0 }, { "hours": 744, "maturity": "final", "period_end": "2024-06-01T00:00:00Z", "period_start": "2024-05-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 26105.0 }, { "hours": 720, "maturity": "final", "period_end": "2024-07-01T00:00:00Z", "period_start": "2024-06-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 25083.0 }, { "hours": 744, "maturity": "final", "period_end": "2024-08-01T00:00:00Z", "period_start": "2024-07-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 35193.0 }, { "hours": 744, "maturity": "final", "period_end": "2024-09-01T00:00:00Z", "period_start": "2024-08-01T00:00:00Z", "quality": "valid", "rows": 2, "value": 38534.0 }, { "hours": 720, "maturity": "final", "period_end": "2024-10-01T00:00:00Z", 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"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": "gas", "schema_version": "1.41.0", "source_name": null, "sources": [ "pudl-epa-eia-crosswalk", "pudl-epacems", "pudl-generators", "pudl-output", "pudl-ownership", "pudl-plants" ], "storage": null, "type": "plant", "updated_reason": null, "water": null }