PowerPlantFactsEvidence report · prepared 2 September 2026https://powerplantfacts.com/entity/3847
EIA plant 3847
Ariel · Cowlitz · WA
Merwin
Operated by PacifiCorp
Published location
Where is Merwin?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
45.956700, -122.554444
Open the interactive map ↗Map data © OpenStreetMap contributors
Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 66,902 MWh |
| 2 | 57,894 MWh |
| 3 | 41,572 MWh |
| 4 | 33,434 MWh |
| 5 | 44,575 MWh |
| 6 | 34,826 MWh |
| 7 | 18,469 MWh |
| 8 | 14,688 MWh |
| 9 | 23,272 MWh |
| 10 | 18,323 MWh |
| 11 | 52,656 MWh |
| 12 | 60,706 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| 1 | Conventional Hydroelectric | WAT | 45 | OP |
| 2 | Conventional Hydroelectric | WAT | 45 | OP |
| 3 | Conventional Hydroelectric | WAT | 45 | OP |
| House | Conventional Hydroelectric | WAT | 1 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
3847
Sector
Electric Utility
Water source
Lewis River
Data edition
2024-final