Washington
Hydro accounted for 69% of generation in Washington over the 12 months to July 2026.
Where they are
Every announced project in Washington with a recorded location; 17 sites.
Hydro69%Natural gas11%Nuclear9%Wind8%Other (<2.5% each)3%
| Fuel | GWh | Share | YoY |
|---|---|---|---|
| Hydro | 77,040 | 68.9% | ↑ 7.3 |
| Natural gas | 12,704 | 11.4% | ↓ 5.8 |
| Nuclear | 9,791 | 8.8% | ↑ 1.3 |
| Wind | 8,609 | 7.7% | ↓ 0.7 |
| Coal | 1,517 | 1.3% | ↓ 2.0 |
| Solar | 1,451 | 1.3% | ↑ 0.1 |
| Other | 633 | 0.6% | ↓ 0.2 |
13-month trend
Natural gas
Coal
Nuclear
Wind
Solar
Hydro
Other
Hub power prices against a national gas-cost benchmark; not a state margin.
What’s standing
The 8 largest of 423 operating generators; 31.8 GW total capacity.
- Columbia Generating StationNuclear · Energy Northwest- Columbia1.2 GW1984
- Grand CouleeHydro · U S Bureau of Reclamation0.8 GW1979
- Grand CouleeHydro · U S Bureau of Reclamation0.8 GW1980
- Grand CouleeHydro · U S Bureau of Reclamation0.8 GW1978
- Transalta Centralia GenerationCoal · TransAlta Centralia Gen LLC0.7 GW1973
- Grand CouleeHydro · U S Bureau of Reclamation0.6 GW1975
- Grand CouleeHydro · U S Bureau of Reclamation0.6 GW1976
- Grand CouleeHydro · U S Bureau of Reclamation0.6 GW1976
On the drawing board
Washington has 31.8 GW standing. Another 355 MW is on the board by 2026: 330 MW testing, 25 MW under construction.
Built since July 2026
- Ostrea Solar, LLCStanding80 MW2026
- SR Quincy ValleyTesting130 MW2026
Battery storage
- Arlington Battery Energy Storage SystemUnder construction25 MW2026
- Greenwater BESSTesting200 MW2026
Washington's announced projects could add 4.4 TWh a year by 2031. Our projection includes 2.9 TWh after applying completion factors based on project status.
Washington in the news
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