Ice Harbor
Hydro power plant · Walla Walla County, Washington
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- USACE Northwestern Division
- County
- Walla Walla County
- Generating units
- 6
- Share of state capacity
- 1.90%
- Rank among hydro plants in Washington
- #12 of 73
- EIA plant code
- 3925
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 4 | Conventional Hydroelectric | 111 MW | 87 MW | 1975 | Operating |
| 5 | Conventional Hydroelectric | 111 MW | 87 MW | 1975 | Operating |
| 6 | Conventional Hydroelectric | 111 MW | 87 MW | 1976 | Operating |
| 1 | Conventional Hydroelectric | 90 MW | 72 MW | 1962 | Out of service but expected to return to service in next calendar year |
| 2 | Conventional Hydroelectric | 90 MW | 90 MW | 1962 | Operating |
| 3 | Conventional Hydroelectric | 90 MW | 90 MW | 1962 | Out of service but expected to return to service in next calendar year |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Washington
| Grays Harbor Energy Facility | Natural gas | 715 MW |
| Rock Island | Hydro | 629 MW |
| Chehalis Generating Facility | Natural gas | 593 MW |
| Ross | Hydro | 450 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 603 MW solar plant and a 603 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Washington power plants · What Washington actually generates