Marengo Wind Plant
Wind power plant · Columbia County, Washington
Nameplate capacity
234 MW
Rank in Washington
#30
of 139 plants
In service since
2007
August 2007
Details
- Primary fuel
- Wind
- Technology
- Onshore Wind Turbine
- Operator
- PacifiCorp
- County
- Columbia County
- Generating units
- 2
- Share of state capacity
- 0.74%
- Rank among wind plants in Washington
- #5 of 23
- EIA plant code
- 56466
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Onshore Wind Turbine | 156 MW | 156 MW | 2007 | Operating |
| 2 | Onshore Wind Turbine | 78 MW | 78 MW | 2008 | 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
| River Road Gen Plant | Natural gas | 248 MW |
| Swift 1 | Hydro | 240 MW |
| Gorge | Hydro | 207 MW |
| White Creek Wind Farm | Wind | 204 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 234 MW solar plant and a 234 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