How many power plants does NorthWestern Energy (MT wind/thermal) operate?

EIA-860M lists 6 operating plants against “NorthWestern Energy (MT wind/thermal)” for 2026-07, totalling 465 MW of nameplate capacity in 2 states.

Is NorthWestern Energy (MT wind/thermal) the owner of these plants?

EIA-860M names one reporting entity per generator. That entity operates the plant on the survey; ownership can sit with a parent, a partnership or a tax-equity structure that the form does not record.

Why are affiliates listed separately?

Because EIA files them separately. Rolling subsidiaries into a parent would need an ownership map EIA-860M does not publish, so this page does not invent one.

NorthWestern Energy (MT wind/thermal) power plants

Every generating plant EIA-860M files against NorthWestern Energy (MT wind/thermal) for 2026-07: 6 plants, 465 MW of nameplate capacity, across 2 states and 3 energy sources.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Plants: 6
Nameplate capacity: 465 MW
States: 2; MT, WY
Energy sources: 3

NorthWestern Energy (MT wind/thermal) plants by energy source

Natural gas2 plants · 410 MW
Petroleum2 plants · 5 MW
Wind2 plants · 50 MW

Full list of NorthWestern Energy (MT wind/thermal) power plants

Power plants operated by NorthWestern Energy (MT wind/thermal)

Yellowstone County Generating StationNatural Gas Internal Combustion Engine	NorthWestern Energy (MT wind/thermal)	Yellowstone	207	18	2024	Operating
Dave Gates Generating StationNatural Gas Fired Combustion Turbine	NorthWestern Energy (MT wind/thermal)	Deer Lodge	203.1	3	2011	Operating
Spion Kop Wind FarmOnshore Wind Turbine	NorthWestern Energy (MT wind/thermal)	Judith Basin	40	1	2012	Operating
Two Dot Wind FarmOnshore Wind Turbine	NorthWestern Energy (MT wind/thermal)	Wheatland	9.7	1	2014	Operating
Lake (WY)Petroleum Liquids	NorthWestern Energy (MT wind/thermal)	Teton	2.7	1	1967	Standby/Backup
Old FaithfulPetroleum Liquids	NorthWestern Energy (MT wind/thermal)	Teton	2	2	1979	Standby/Backup

NorthWestern Energy (MT wind/thermal): FAQ

How many power plants does NorthWestern Energy (MT wind/thermal) operate?: EIA-860M lists 6 operating plants against “NorthWestern Energy (MT wind/thermal)” for 2026-07, totalling 465 MW of nameplate capacity in 2 states.
Is NorthWestern Energy (MT wind/thermal) the owner of these plants?: EIA-860M names one reporting entity per generator. That entity operates the plant on the survey; ownership can sit with a parent, a partnership or a tax-equity structure that the form does not record.
Why are affiliates listed separately?: Because EIA files them separately. Rolling subsidiaries into a parent would need an ownership map EIA-860M does not publish, so this page does not invent one.