Power plants in Walla Walla County, Washington
4 operating power plants in Walla Walla County, Washington, with 1,277 MW of nameplate capacity, largest first. From EIA-860M, August 2026.
Largest power plants in Walla Walla County
| # | Plant | MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | Lower MonumentalHydro | 675 | 1,477 | 20.8% |
| 2 | Ice HarborHydro | 423 | 1,511 | 28.6% |
| 3 | FPL Energy Vansycle LLC (WA)Wind | 177 | 250 | 16.1% |
| 4 | Twin ReservoirsHydro | 2.2 | 6.9 | 35.6% |
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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