How many power plants does NorthWestern Energy (MT Hydro) operate?

EIA-860M lists 10 operating plants against “NorthWestern Energy (MT Hydro)” for 2026-07, totalling 461 MW of nameplate capacity in 1 state.

Is NorthWestern Energy (MT Hydro) 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 Hydro) power plants

Every generating plant EIA-860M files against NorthWestern Energy (MT Hydro) for 2026-07: 10 plants, 461 MW of nameplate capacity, across 1 state and 1 energy source.

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: 10
Nameplate capacity: 461 MW
States: 1; MT
Energy sources: 1

NorthWestern Energy (MT Hydro) plants by energy source

Hydro10 plants · 461 MW

Full list of NorthWestern Energy (MT Hydro) power plants

Power plants operated by NorthWestern Energy (MT Hydro)

Thompson FallsConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Sanders	98.1	7	1915	Operating
MoronyConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Cascade	63	2	1930	Operating
CochraneConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Cascade	59.4	2	1958	Operating
Rainbow (MT)Conventional Hydroelectric	NorthWestern Energy (MT Hydro)	Cascade	59	1	2013	Operating
RyanConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Cascade	55.2	6	1915	Operating
HolterConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Cascade	54.6	4	1918	Operating
Black EagleConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Cascade	26.7	3	1927	Operating
HauserConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Lewis and Clark	16.8	5	1911	Operating
Madison DamConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Madison	16.4	4	2021	Operating
MysticConventional Hydroelectric	NorthWestern Energy (MT Hydro)	Stillwater	12	2	1925	Operating

NorthWestern Energy (MT Hydro): FAQ

How many power plants does NorthWestern Energy (MT Hydro) operate?: EIA-860M lists 10 operating plants against “NorthWestern Energy (MT Hydro)” for 2026-07, totalling 461 MW of nameplate capacity in 1 state.
Is NorthWestern Energy (MT Hydro) 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.