Nameplate capacity
991 MW
Rank in Oregon
#4
of 301 plants
In service since
1953
December 1953
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- USACE Northwestern Division
- County
- Umatilla County
- Generating units
- 14
- Share of state capacity
- 5.16%
- Rank among hydro plants in Oregon
- #4 of 63
- EIA plant code
- 3084
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 14 | Conventional Hydroelectric | 81 MW | 81 MW | 1957 | Operating |
| 1 | Conventional Hydroelectric | 70 MW | 70 MW | 1953 | Operating |
| 10 | Conventional Hydroelectric | 70 MW | 70 MW | 1955 | Operating |
| 11 | Conventional Hydroelectric | 70 MW | 70 MW | 1956 | Operating |
| 12 | Conventional Hydroelectric | 70 MW | 70 MW | 1956 | Operating |
| 13 | Conventional Hydroelectric | 70 MW | 70 MW | 1957 | Operating |
| 2 | Conventional Hydroelectric | 70 MW | 70 MW | 1954 | Operating |
| 3 | Conventional Hydroelectric | 70 MW | 70 MW | 1954 | Operating |
| 4 | Conventional Hydroelectric | 70 MW | 70 MW | 1954 | Operating |
| 5 | Conventional Hydroelectric | 70 MW | 58 MW | 1954 | Out of service but expected to return to service in next calendar year |
| 6 | Conventional Hydroelectric | 70 MW | 58 MW | 1955 | Out of service but expected to return to service in next calendar year |
| 7 | Conventional Hydroelectric | 70 MW | 70 MW | 1955 | Operating |
| 8 | Conventional Hydroelectric | 70 MW | 70 MW | 1955 | Operating |
| 9 | Conventional Hydroelectric | 70 MW | 70 MW | 1956 | Operating |
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 Oregon
| The Dalles | Hydro | 1,820 MW |
| Bonneville | Hydro | 1,162 MW |
| Hermiston Power Partnership | Natural gas | 689 MW |
| Hermiston Generating Plant | Natural gas | 621 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 991 MW solar plant and a 991 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 Oregon power plants · What Oregon actually generates