Garrison
Hydro power plant · Mercer County, North Dakota
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- USACE-Omaha
- County
- Mercer County
- Generating units
- 5
- Share of state capacity
- 5.20%
- Rank among hydro plants in North Dakota
- #1 of 1
- EIA plant code
- 2815
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 122 MW | 102 MW | 1956 | Operating |
| 2 | Conventional Hydroelectric | 122 MW | 102 MW | 1956 | Operating |
| 3 | Conventional Hydroelectric | 122 MW | 102 MW | 1956 | Operating |
| 4 | Conventional Hydroelectric | 109 MW | 102 MW | 1960 | Operating |
| 5 | Conventional Hydroelectric | 109 MW | 102 MW | 1960 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in North Dakota
| Milton R Young | Coal | 734 MW |
| Leland Olds | Coal | 656 MW |
| Coyote | Coal | 450 MW |
| Lonesome Creek Station | Natural gas | 363 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 583 MW solar plant and a 583 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All North Dakota power plants · What North Dakota actually generates