5th largest plant in North Dakota · 641st nationally
Garrison is a hydroelectric power plant in North Dakota with a nameplate capacity of 583 MW. It generates roughly 2.1M MWh per year — enough to power about 201,819 average U.S. homes.
Its capacity factor of 41% puts it in the middle range — running steadily but not full-time.
| Plant Name | Garrison |
|---|---|
| Operator | Usace-Omaha |
| City | Riverside |
| County | Mercer County |
| State | North Dakota |
| ZIP | 58565 |
| Coordinates | 47.49450, -101.41150 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | Water | 122 MW | Operating | 1956 |
| 2 | Conventional Hydroelectric | Water | 122 MW | Operating | 1956 |
| 3 | Conventional Hydroelectric | Water | 122 MW | Operating | 1956 |
| 4 | Conventional Hydroelectric | Water | 109 MW | Operating | 1960 |
| 5 | Conventional Hydroelectric | Water | 109 MW | Operating | 1960 |
| NERC Region | MRO |
|---|---|
| Balancing Authority | Southwest Power Pool |
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.