Power plants in Grant County, Washington

5 operating power plants in Grant County, Washington, with 9,098 MW of nameplate capacity, largest first. From EIA-860M, August 2026.

Plants

Nameplate capacity

9,098 MW

Net generation, 2025

25.2 TWh

Largest

Grand Coulee

6,809 MW

Largest power plants in Grant County

#	Plant	MW	2025 net generation, GWhGWh, 2025	Capacity factor	Operator
1	Grand CouleeHydro	6,809	16,151	–	U S Bureau of Reclamation
2	WanapumHydro	1,220	4,438	41.5%	PUD No 2 of Grant County - (WA)
3	Priest RapidsHydro	950	4,165	50.0%	PUD No 2 of Grant County - (WA)
4	Summer Falls Power PlantHydro	92	391	48.5%	Columbia Basin Hydropower
5	Main Canal HeadworksHydro	27	105	44.8%	Columbia Basin Hydropower

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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