Saint Marys Falls
Hydro power plant · Chippewa County, Michigan
Nameplate capacity
24 MW
Rank in Michigan
#108
of 289 plants
In service since
1932
July 1932
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- USACE-Detroit District
- County
- Chippewa County
- Generating units
- 5
- Share of state capacity
- 0.07%
- Rank among hydro plants in Michigan
- #4 of 51
- EIA plant code
- 1865
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 6.2 MW | 5.1 MW | 1951 | Operating |
| 2 | Conventional Hydroelectric | 6.2 MW | 5.2 MW | 1951 | Operating |
| 3 | Conventional Hydroelectric | 6.2 MW | 5.2 MW | 1952 | Operating |
| 10 | Conventional Hydroelectric | 2.6 MW | 2.0 MW | 1932 | Operating |
| 3A | Conventional Hydroelectric | 2.5 MW | 2.5 MW | 1954 | 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 Michigan
| Claude Vandyke | Natural gas | 25 MW |
| Plant Four | Other | 24 MW |
| Vestaburg | Natural gas | 24 MW |
| Gladstone | Other | 23 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 24 MW solar plant and a 24 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 Michigan power plants · What Michigan actually generates