68th largest plant in Idaho · 5036th nationally
Upper Salmon B is a hydroelectric power plant in Idaho with a nameplate capacity of 16.5 MW. It generates roughly 87.8k MWh per year — enough to power about 8,364 average U.S. homes.
Its capacity factor of 61% puts it in the middle range — running steadily but not full-time.
| Plant Name | Upper Salmon B |
|---|---|
| Operator | Idaho Power Co |
| City | Hagerman |
| County | Twin Falls County |
| State | Idaho |
| ZIP | 83332 |
| Coordinates | 42.76640, -114.90824 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 2 | Conventional Hydroelectric | Water | 8.3 MW | Operating | 1947 |
| 1 | Conventional Hydroelectric | Water | 8.2 MW | Operating | 1947 |
| NERC Region | WECC |
|---|---|
| Balancing Authority | Idaho Power Company |
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.