78th largest plant in Washington · 3991st nationally
Nine Mile is a hydroelectric power plant in Washington with a nameplate capacity of 37.6 MW. It generates roughly 118.3k MWh per year — enough to power about 11,266 average U.S. homes.
Its capacity factor of 36% reflects intermittent or peaking operation.
| Plant Name | Nine Mile |
|---|---|
| Operator | Avista Corp |
| City | Nine Mile |
| County | Spokane County |
| State | Washington |
| ZIP | 99026 |
| Coordinates | 47.76972, -117.53722 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 3N | Conventional Hydroelectric | Water | 10.0 MW | Operating | 1994 |
| 4N | Conventional Hydroelectric | Water | 10.0 MW | Operating | 1994 |
| 1 | Conventional Hydroelectric | Water | 8.8 MW | Operating | 1910 |
| 2 | Conventional Hydroelectric | Water | 8.8 MW | Operating | 1908 |
| NERC Region | WECC |
|---|---|
| Balancing Authority | Avista Corporation |
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.