Main Canal Headworks
Hydro power plant · Grant County, Washington
Nameplate capacity
27 MW
Rank in Washington
#82
of 139 plants
In service since
1987
January 1987
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Columbia Basin Hydropower
- County
- Grant County
- Generating units
- 1
- Share of state capacity
- 0.08%
- Rank among hydro plants in Washington
- #39 of 73
- EIA plant code
- 56698
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 27 MW | 27 MW | 1987 | 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
| Sierra Pacific Burlington Facility | Other | 28 MW |
| Packwood | Hydro | 28 MW |
| Spokane Waste to Energy | Other | 26 MW |
| Boulder Park | Natural gas | 25 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 27 MW solar plant and a 27 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