Balancing authorityRegional context

NorthWestern Energy

Listed by EIA as “NorthWestern Energy (NWMT)”.

About this record

NorthWestern Energy (NWMT)

2024 inventory / 2024 calendar year

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Plants

60count

Source & method

Published plants in scope

2024 inventory · reported · derived · valid · final

core_eia__codes_balancing_authorities.parquet; code=NWMT

Publisher & attribution ↗ Cite this released fact ↗

Nameplate capacity, operating generatorsFull nameplate rating of the operating generators, before ownership shares. MW measures rated power; annual output is energy in MWh.Definition ↗

3,987.5MW

Partial or uncertain coverage: Reported operating capacity; missing components stay missing

Source & method

Sum of operating nameplate MW over published plants whose reported balancing authority code is this BA; a reporting relationship, not a footprint

2024 inventory · reported · derived · suspect · final

59 of 60 plants included.

Reported operating capacity; missing components stay missing

core_eia__codes_balancing_authorities.parquet; code=NWMT

Publisher & attribution ↗ Cite this released fact ↗

Net generationEnergy produced over the stated period after the plant’s own use, including signed storage output. Plant output is not allocated to owners or buyers.Definition ↗

17,224,891MWh

2024

Partial or uncertain coverage: 1 plants with operating capacity have no EIA-923 row for the year; their output is unknown, not zero

Source & method

Sum of plant annual net generation over published plants reporting this BA; plants without an EIA-923 row are not counted

2024 calendar year · reported · derived · suspect · final

46 of 47 plants with operating capacity included.

1 plants with operating capacity have no EIA-923 row for the year; their output is unknown, not zero

core_eia__codes_balancing_authorities.parquet; code=NWMT

Publisher & attribution ↗ Cite this released fact ↗

Latest EIA-930 hourly report

Reading the latest published values…

Hourly operations, summarized by month

EIA-930 · MWa

EIA-930Hourly electricity demand, generation and interchange. Reported values are the authority’s filings. EIA-adjusted values account for non-physical commercial transfers; EIA-imputed values replace missing or anomalous reports with estimates. Every demand report EIA replaced is left out of every sum and mean here; a replaced generation or interchange report is left out when it is whose magnitude is at least 1.5 times the largest unreplaced magnitude of that authority and year, since zeros and imports are real there. The estimate is never used in its place.Definition ↗ reports for this authority, 2023-10 to 2026-09 (UTC months). Mean MW over the hours reported; a dot marks a month with under 90% of hours.

Reported demand; every hour EIA marked is left out and counted, and EIA's adjusted and imputed series are in the download table, never substituted here.

Monthly mean demand, net generation and total interchange (positive = export) as this authority reported them; months with no report are gaps, not zero.

Monthly values as a table · MWa

Monthly mean demand, net generation and total interchange (positive = export) as this authority reported them; months with no report are gaps, not zero.
Month (UTC)	Demand	Hours reported	Net generation	Hours reported	Total interchange	Hours reported
2023-10	1,278 MWa	744 h(100%)	1,948 MWa	744 h(100%)	670 MWa	744 h(100%)
2023-11	1,408 MWa	720 h(100%)	2,374 MWa	720 h(100%)	966 MWa	720 h(100%)
2023-12	1,482 MWa	744 h(100%)	2,560 MWa	744 h(100%)	1,078 MWa	744 h(100%)
2024-01	1,610 MWa	744 h(100%)	2,452 MWa	744 h(100%)	841 MWa	744 h(100%)
2024-02	1,473 MWa	696 h(100%)	2,355 MWa	696 h(100%)	881 MWa	696 h(100%)
2024-03	1,402 MWa	744 h(100%)	1,960 MWa	744 h(100%)	558 MWa	744 h(100%)
2024-04	1,295 MWa	720 h(100%)	1,996 MWa	720 h(100%)	701 MWa	720 h(100%)
2024-05	1,252 MWa	744 h(100%)	1,421 MWa	744 h(100%)	169 MWa	744 h(100%)
2024-06	1,330 MWa	719 h(100%)· 1 h replaced by EIA, left out	1,640 MWa	720 h(100%)	312 MWa	720 h(100%)
2024-07	1,443 MWa	743 h(100%)· 1 h replaced by EIA, left out	1,956 MWa	743 h(100%)· 1 h replaced by EIA, left out	510 MWa	744 h(100%)
2024-08	1,356 MWa	742 h(100%)· 2 h replaced by EIA, left out	2,218 MWa	743 h(100%)· 1 h replaced by EIA, left out	859 MWa	744 h(100%)
2024-09	1,261 MWa	720 h(100%)	2,373 MWa	720 h(100%)	1,112 MWa	720 h(100%)
2024-10	1,205 MWa	743 h(100%)· 1 h replaced by EIA, left out	2,176 MWa	743 h(100%)· 1 h replaced by EIA, left out	969 MWa	744 h(100%)
2024-11	1,363 MWa	719 h(100%)· 1 h replaced by EIA, left out	2,216 MWa	719 h(100%)· 1 h replaced by EIA, left out	853 MWa	720 h(100%)
2024-12	1,433 MWa	744 h(100%)	2,614 MWa	744 h(100%)	1,181 MWa	744 h(100%)
2025-01	1,564 MWa	744 h(100%)	2,612 MWa	744 h(100%)	1,048 MWa	744 h(100%)
2025-02	1,597 MWa	672 h(100%)	2,491 MWa	672 h(100%)	894 MWa	672 h(100%)
2025-03	1,313 MWa	744 h(100%)	2,087 MWa	744 h(100%)	774 MWa	744 h(100%)
2025-04	1,230 MWa	720 h(100%)	1,813 MWa	720 h(100%)	584 MWa	720 h(100%)
2025-05	1,181 MWa	744 h(100%)	1,830 MWa	744 h(100%)	649 MWa	744 h(100%)
2025-06	1,289 MWa	720 h(100%)	1,862 MWa	720 h(100%)	572 MWa	720 h(100%)
2025-07	1,395 MWa	743 h(100%)· 1 h replaced by EIA, left out	2,433 MWa	743 h(100%)· 1 h replaced by EIA, left out	1,038 MWa	744 h(100%)
2025-08	1,368 MWa	744 h(100%)	2,381 MWa	744 h(100%)	1,014 MWa	744 h(100%)
2025-09	1,242 MWa	720 h(100%)	1,998 MWa	720 h(100%)	756 MWa	720 h(100%)
2025-10	1,236 MWa	741 h(100%)· 3 h replaced by EIA, left out	2,325 MWa	741 h(100%)· 3 h replaced by EIA, left out	1,086 MWa	744 h(100%)
2025-11	1,303 MWa	720 h(100%)	2,461 MWa	720 h(100%)	1,158 MWa	720 h(100%)
2025-12	1,425 MWa	743 h(100%)· 1 h replaced by EIA, left out	2,092 MWa	743 h(100%)· 1 h replaced by EIA, left out	667 MWa	744 h(100%)
2026-01	1,392 MWa	744 h(100%)	2,460 MWa	744 h(100%)	1,068 MWa	744 h(100%)
2026-02	1,371 MWa	672 h(100%)	2,179 MWa	672 h(100%)	809 MWa	672 h(100%)
2026-03	1,254 MWa	744 h(100%)	1,888 MWa	744 h(100%)	634 MWa	744 h(100%)
2026-04	1,215 MWa	720 h(100%)	1,857 MWa	720 h(100%)	642 MWa	720 h(100%)
2026-05	1,235 MWa	743 h(100%)· 1 h replaced by EIA, left out	1,643 MWa	744 h(100%)	410 MWa	744 h(100%)
2026-06	1,273 MWa	718 h(100%)· 2 h replaced by EIA, left out	1,857 MWa	719 h(100%)· 1 h replaced by EIA, left out	590 MWa	720 h(100%)
2026-07	1,511 MWa	744 h(100%)	2,246 MWa	744 h(100%)	736 MWa	744 h(100%)
2026-08	1,411 MWa	744 h(100%)	2,365 MWa	744 h(100%)	953 MWa	744 h(100%)
2026-09	1,302 MWa	102 h(14%)	2,349 MWa	102 h(14%)	1,047 MWa	102 h(14%)

Interchange by neighbour, latest month · MWa

AESOvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
0 MWa· 2026-09
AVAvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
86 MWa· 2026-09
BPATvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
996 MWa· 2026-09
GWAvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
-115 MWa· 2026-09
IPCOvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
11 MWa· 2026-09
PACEvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
112 MWa· 2026-09
SWPWvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
-132 MWa· 2026-09
WAUWvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
74 MWa· 2026-04
WWAvalue = this authority's report of the boundary (positive = export); counterpart_value = the neighbour's own report of the same boundary with the sign flipped; discrepancy = |own + neighbour| / max(|own|, |neighbour|, 100 MWa). Both reports are kept; neither is corrected
-49 MWa· 2025-10

EIA-930 hourly reports summarized by UTC month; means cover the kept reported hours and carry their coverage, leaving out the flagged hours EIA marked (hours_flagged); the 2024Q3 fuel taxonomy change appears as new source codes

Plants reporting to this balancing authorityThe organization that balances electricity supply and demand in a reporting area.Definition ↗

Operating MW

A reporting assignment, not a retail supply relationship.

Colstrip Steam Electric Station 1,647.4MW
Se̓liš Ksanka Ql̓ispe̓ Dam 227.8MW
Clearwater Wind East 207.9MW
Yellowstone County Generating Station 207MW
Dave Gates Generating Station 203.1MW
Judith Gap Wind Energy Center 135MW
Hardin Generator Project 115.7MW
Clearwater Wind II 102.8MW
Thompson Falls 98.1MW
South Peak Wind 80MW
MTSUN 80MW
Apex Solar 80MW
Stillwater Wind, LLC 79.7MW
Yellowstone Energy LP 68MW
Morony 63MW
Cochrane 60.4MW
Rainbow (MT) 59MW
Ryan 55.2MW
Basin Creek Plant 54.9MW
Colstrip Energy LP 46.1MW
Spion Kop Wind Farm 40MW
Holter 39.6MW
Black Eagle 26.7MW
Greenfield Wind - MT 25MW
Big Timber Wind Farm 25MW
Gordon Butte Wind LLC 17.7MW
Madison Dam 16.4MW
Hauser 16.3MW
Turnbull Hydro 13MW
Mystic 12MW
Musselshell Wind Project 10MW
Musselshell Wind Project Two LLC 10MW
Fairfield Wind 10MW
Broadwater Power Project 9.7MW
Two Dot Wind Farm 9.7MW
Horseshoe Bend Wind Park 9MW
South Mills Solar, LLC 3MW
Green Meadow Solar, LLC 3MW
Great Divide Solar, LLC 3MW
Black Eagle Solar, LLC 3MW
Magpie Solar, LLC 3MW
South Dry Creek Hydro 2MW
Flint Creek Hydroelectric LLC 2MW
River Bend Solar, LLC 2MW
GCC Trident Solar Project 2MW
Two Dot Wind Broadview East LLC 1.8MW
Western Sugar Cooperative - Billings 1.5MW
J E Corette Plant 0MW
Milltown 0MW
Old Faithful 0MW
Lake (WY) 0MW
Phillips 66 Billings Refinery 0MW
Sidney MT Plant Not reported
Jawbone Wind Project 0MW
Crazy Mountain Wind LLC 0MW
Haymaker Hybrid 0MW
Beaver Creek Wind Facility 0MW
Beartooth Energy Storage LLC 0MW
Anthelope Hills Solar Generation BESS 0MW
Opportunity Solar Generation and BESS 0MW

Sources for this record

Frozen citation page ↗

Display names and aliases (pipeline/config/crosswalks/aliases.csv)

Display names verified against each organization's own website; EIA legal names retained as aliases

A display name is the name an organization uses for itself; the EIA name stays searchable and on the record. Each row cites the page that shows the name.

Original source ↗Method & license

PUDL v2026.9.0, out_eia__yearly_plants

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)

Original source ↗Method & license

PUDL v2026.9.0, out_eia__yearly_generators

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)

Original source ↗Method & license

PUDL v2026.9.0, out_eia923__yearly_generation_fuel_combined

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)

Original source ↗Method & license

PUDL v2026.9.0, core_eia__codes_balancing_authorities

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)

Original source ↗Method & license

Release 20260929T050546Z-51ae0f7d3c78 · Record JSON