Boundary
Hydro power plant · Pend Oreille County, Washington
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- City of Seattle - (WA)
- County
- Pend Oreille County
- Generating units
- 6
- Share of state capacity
- 3.66%
- Rank among hydro plants in Washington
- #5 of 73
- EIA plant code
- 6433
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 55 | Conventional Hydroelectric | 239 MW | 232 MW | 1985 | Operating |
| 56 | Conventional Hydroelectric | 239 MW | 232 MW | 1986 | Operating |
| 51 | Conventional Hydroelectric | 181 MW | 181 MW | 1967 | Operating |
| 54 | Conventional Hydroelectric | 181 MW | 181 MW | 1967 | Operating |
| 52 | Conventional Hydroelectric | 162 MW | 162 MW | 1967 | Operating |
| 53 | Conventional Hydroelectric | 158 MW | 158 MW | 1967 | 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 Washington
| Wanapum | Hydro | 1,220 MW |
| Columbia Generating Station | Nuclear | 1,200 MW |
| Priest Rapids | Hydro | 950 MW |
| Wells | Hydro | 867 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 1,160 MW solar plant and a 1,160 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