31st largest plant in Montana · 3427th nationally
Holter is a hydroelectric power plant in Montana with a nameplate capacity of 56.8 MW. It generates roughly 281.6k MWh per year — enough to power about 26,817 average U.S. homes.
Its capacity factor of 57% puts it in the middle range — running steadily but not full-time.
| Plant Name | Holter |
|---|---|
| Operator | Northwestern Energy (Mt Hydro) |
| City | Wolf Creek |
| County | Cascade County |
| State | Montana |
| ZIP | 59648 |
| Coordinates | 46.99150, -112.00470 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| HOL1 | Conventional Hydroelectric | Water | 15.0 MW | Operating | 1918 |
| HOL2 | Conventional Hydroelectric | Water | 15.0 MW | Out of Service | 1918 |
| HOL3 | Conventional Hydroelectric | Water | 15.0 MW | Operating | 1918 |
| HOL4 | Conventional Hydroelectric | Water | 9.6 MW | Operating | 1918 |
| NERC Region | WECC |
|---|---|
| Balancing Authority | Northwestern Energy (Nwmt) |
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.