Solar farms in Washington
9 operating solar farms in Washington with 348 MW of solar capacity, largest first. From EIA-860M, August 2026.
Plants
9
Solar capacity
348 MW
Net generation, 2025
628 GWh
8 of 9 plants reported
Largest solar farms in Washington
| # | Plant | Solar MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | Lund Hill SolarKlickitat County | 150 | 367 | 28.0% |
| 2 | Ostrea Solar, LLCYakima County | 80 | – | – |
| 3 | Goose Prairie SolarYakima County | 80 | 177 | 25.3% |
| 4 | Adams Nielson SolarAdams County | 19 | 44.6 | 26.5% |
| 5 | Urtica Solar ProjectKittitas County | 5.0 | 11.4 | 26.1% |
| 6 | Penstemon Solar ProjectKittitas County | 5.0 | 11.2 | 25.5% |
| 7 | Camas Solar ProjectKittitas County | 5.0 | 10.7 | 24.5% |
| 8 | Horn Rapids Solar, Storage and TrainingBenton County · Solar and battery storage | 3.2 | 4.6 | 17.5% |
| 9 | Arlington MicrogridSnohomish County · Solar and battery storage | 0.5 | 0.6 | 14.8% |
Projects where solar is the largest fuel or at least a fifth of nameplate capacity. MW is solar nameplate only; net generation covers the whole project. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources