14th largest plant in Washington · 578th nationally
Rock Island is a hydroelectric power plant in Washington with a nameplate capacity of 629 MW. It generates roughly 2.0M MWh per year — enough to power about 193,593 average U.S. homes.
Its capacity factor of 37% reflects intermittent or peaking operation.
| Plant Name | Rock Island |
|---|---|
| Operator | Pud No 1 Of Chelan County |
| City | Wenatchee |
| County | Chelan County |
| State | Washington |
| ZIP | 98801 |
| Coordinates | 47.34611, -120.09170 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| U-1 | Conventional Hydroelectric | Water | 51.3 MW | Operating | 1979 |
| U-2 | Conventional Hydroelectric | Water | 51.3 MW | Operating | 1979 |
| U-3 | Conventional Hydroelectric | Water | 51.3 MW | Operating | 1979 |
| U-4 | Conventional Hydroelectric | Water | 51.3 MW | Operating | 1979 |
| U-5 | Conventional Hydroelectric | Water | 51.3 MW | Out of Service | 1978 |
| U-6 | Conventional Hydroelectric | Water | 51.3 MW | Operating | 1978 |
| U-7 | Conventional Hydroelectric | Water | 51.3 MW | Operating | 1978 |
| U-8 | Conventional Hydroelectric | Water | 51.3 MW | Operating | 1978 |
| B-10 | Conventional Hydroelectric | Water | 22.5 MW | Operating | 1953 |
| B-5 | Conventional Hydroelectric | Water | 22.5 MW | Operating | 1952 |
| B-6 | Conventional Hydroelectric | Water | 22.5 MW | Operating | 1952 |
| B-7 | Conventional Hydroelectric | Water | 22.5 MW | Operating | 1952 |
| B-8 | Conventional Hydroelectric | Water | 22.5 MW | Operating | 1953 |
| B-9 | Conventional Hydroelectric | Water | 22.5 MW | Out of Service | 1953 |
| B-1 | Conventional Hydroelectric | Water | 20.7 MW | Out of Service | 1931 |
| B-2 | Conventional Hydroelectric | Water | 20.7 MW | Out of Service | 1931 |
| B-3 | Conventional Hydroelectric | Water | 20.7 MW | Operating | 1932 |
| B-4 | Conventional Hydroelectric | Water | 20.7 MW | Operating | 1932 |
| A | Conventional Hydroelectric | Water | 1.2 MW | Operating | 1931 |
| NERC Region | WECC |
|---|---|
| Balancing Authority | Public Utility District No. 1 Of Chelan County |
Hydroelectric plants spin turbines using falling or flowing water — typically from a dam-impounded reservoir. They are dispatchable, long-lived, and emission-free at the point of generation, though large reservoirs can disrupt rivers and ecosystems and methane can be released from flooded vegetation.