Power plants in Big Horn County, Montana

3 operating power plants in Big Horn County, Montana, with 397 MW of nameplate capacity, largest first. From EIA-860M, August 2026.

Plants

Nameplate capacity

397 MW

Net generation, 2025

749 GWh

Largest

Yellowtail

278 MW

Largest power plants in Big Horn County

#	Plant	MW	2025 net generation, GWhGWh, 2025	Capacity factor	Operator
1	YellowtailHydro	278	566	23.2%	U S Bureau of Reclamation
2	Hardin Generator ProjectCoal	116	178	17.6%	Heorot Power Management
3	South Mills Solar, LLCSolar	3.0	4.9	18.7%	Adapture Renewables, Inc.

MW is the nameplate capacity of operating generators and batteries. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources

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Other counties in Montana

Cascade County8 plants · 321 MW Rosebud County5 plants · 2,262 MW Yellowstone County5 plants · 358 MW Flathead County4 plants · 438 MW Lewis and Clark County4 plants · 80 MW Stillwater County4 plants · 342 MW Wheatland County4 plants · 165 MW Roosevelt County3 plants · 168 MW Teton County3 plants · 48 MW

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