Yellowstone County, MT. Reports to the NorthWestern Energy balancing authorityThe organization that balances electricity supply and demand in a reporting area.Definition ↗.
2024 inventory / 2024 calendar year
Sum of generator nameplate MW with operational status code OP in the inventory year; one row per generator; unscaled by ownership
2024 inventory · reported · derived · valid · final
18 of 18 operating generators included.
out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=67766
Publisher & attribution ↗ Cite this released fact ↗Sum of EIA-923 annual net generation over the plant's unique prime-mover x energy-source rows; negative values (pumping, station use) retained
2024 calendar year · reported · derived · valid · final
1 of 1 plant x prime-mover x fuel rows included.
out_eia923__yearly_generation_fuel_combined.parquet; report_date=2024-01-01; plant_id_eia=67766
Publisher & attribution ↗ Cite this released fact ↗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
2024 calendar year · reported · derived · unsupported · final
Operating capacity changed during the year (unit started, retired, or has no operating date); no fixed denominator
derived: net_generation_mwh@2024 / (nameplate_mw_op x 8784 h)
Publisher & attribution ↗ Cite this released fact ↗Annual net generation · MWh. Bars below zero are negative net generation; a hollow mark means not reported. Missing years are not filled.
| Calendar year | Net generation · MWh | Evidence |
|---|---|---|
| 2024 | 83,378MWh | reported · final |
Sum of unique plant x prime-mover x fuel rows per year; negative values retained; missing years absent, not zero; no monthly curve inferred
Operating nameplate MW x ownership fraction, once per generator; reported schedule or EIA-860 schedule-4 default. Ownership source & rules ↗
| Generator | Technology / statusWhether a generator or project is operating, planned, on standby or retired, as its source reports it.Definition ↗ | NameplateA generator’s rated maximum power, in MW. Capacity is a rating, not how much electricity it produced.Definition ↗ · MW | Ownership basisHow a generator's owners were established: from EIA-860's ownership schedule (reported), from EIA's rule that a unit absent from a complete schedule is wholly owned by its operator (derived), or unknown.Definition ↗ |
|---|---|---|---|
| YGS01 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS02 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS03 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS04 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS05 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS06 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS07 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS08 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS09 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS10 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS11 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS12 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS13 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS14 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS15 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS16 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS17 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
| YGS18 | Natural Gas Internal Combustion Engineoperating (OP) | 11.5MW | EIA schedule default · derivedGenerator absent from a complete Schedule 4 with ownership code S and known operator: wholly owned by the operator per EIA instructions (derived) NorthWestern Energy · 1 fraction · 11.5MW owned · reported, derived |
None of this plant’s units is in EPA’s continuous monitoring programme for this year, so no CEMS data exists for it. That is not a claim of zero emissions: units outside the programme file nothing here. Source
No confirmed status or capacity changes among comparable units. Missing monthly assertions and units outside the baseline have no like-for-like comparison.
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
2026-08-01 · reported · derived · valid · provisional
18 of 18 current and historical generators included.
Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=67766; report_date=2026-08-01
Publisher & attribution ↗ Cite this released fact ↗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
2026-08-01 · reported · derived · not_applicable · provisional
18 of 18 current and historical generators included.
Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=67766; report_date=2026-08-01
Publisher & attribution ↗ Cite this released fact ↗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
2026-08-01 · reported · derived · not_applicable · provisional
18 of 18 current and historical generators included.
Preliminary Monthly Electric Generator Inventory, August 2026; plant_id_eia=67766; report_date=2026-08-01
Publisher & attribution ↗ Cite this released fact ↗Each unit's operating span from its reported operating date to its retirement date or to the August 2026 inventory (the vertical line). Dashed spans start at a planned operating date, a forecast; a short bar marks a planned retirement. Standby and out-of-service units are hatched.
| Unit | State | Operating since | Planned | Retired | MW |
|---|---|---|---|---|---|
| YGS01 | Operating | July 2024 | — | — | 11.5MW |
| YGS02 | Operating | July 2024 | — | — | 11.5MW |
| YGS03 | Operating | July 2024 | — | — | 11.5MW |
| YGS04 | Operating | July 2024 | — | — | 11.5MW |
| YGS05 | Operating | July 2024 | — | — | 11.5MW |
| YGS06 | Operating | July 2024 | — | — | 11.5MW |
| YGS07 | Operating | July 2024 | — | — | 11.5MW |
| YGS08 | Operating | July 2024 | — | — | 11.5MW |
| YGS09 | Operating | July 2024 | — | — | 11.5MW |
| YGS10 | Operating | July 2024 | — | — | 11.5MW |
| YGS11 | Operating | July 2024 | — | — | 11.5MW |
| YGS12 | Operating | July 2024 | — | — | 11.5MW |
| YGS13 | Operating | July 2024 | — | — | 11.5MW |
| YGS14 | Operating | July 2024 | — | — | 11.5MW |
| YGS15 | Operating | July 2024 | — | — | 11.5MW |
| YGS16 | Operating | July 2024 | — | — | 11.5MW |
| YGS17 | Operating | July 2024 | — | — | 11.5MW |
| YGS18 | Operating | July 2024 | — | — | 11.5MW |
Independently dated by EIA-860M; the baseline facts above stay the validated edition. Planned dates are forecasts; retired is not demolished.
Balancing authority: NorthWestern Energy
Approximate service areasAn approximate utility service area. The boundary cannot identify the supplier for a particular address.Definition ↗ containing the plant’s location. A geographic candidate, not a supply relationship.
Within 3 km of the reported plant point, nearest first. BPA’s published lines, HIFLD-compiled lines of other owners and HIFLD 2022 substations; nearness does not establish an electrical connection.
Generator rows for the plant in the inventory year, any status
2024 inventory · reported · derived · valid · final
out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=67766
Publisher & attribution ↗ Cite this released fact ↗Generator rows with status code OP
2024 inventory · reported · derived · valid · final
out_eia__yearly_generators.parquet; report_date=2024-01-01; plant_id_eia=67766
Publisher & attribution ↗ Cite this released fact ↗Catalyst Cooperative, PUDL v2026.9.0, derived from U.S. EIA Forms 860/923
Data transformed by PUDL from U.S. EIA forms; selected fields republished; EIA data is public with dated acknowledgment (https://www.eia.gov/about/copyrights_reuse.php)
Catalyst Cooperative, PUDL v2026.9.0, derived from U.S. EIA Forms 860/923
Data transformed by PUDL from U.S. EIA forms; selected fields republished; EIA data is public with dated acknowledgment (https://www.eia.gov/about/copyrights_reuse.php)
Catalyst Cooperative, PUDL v2026.9.0, derived from U.S. EIA Forms 860/923
Data transformed by PUDL from U.S. EIA forms; selected fields republished; EIA data is public with dated acknowledgment (https://www.eia.gov/about/copyrights_reuse.php)
Catalyst Cooperative, PUDL v2026.9.0, derived from U.S. EIA Forms 860/923
Data transformed by PUDL from U.S. EIA forms; selected fields republished; EIA data is public with dated acknowledgment (https://www.eia.gov/about/copyrights_reuse.php)
Release 20260929T050546Z-51ae0f7d3c78 · Record JSON