Saint Marys Falls
Chippewa County, Michigan · EIA plant ID 1865 · Operator: USACE-Detroit District
Nameplate24MWSummer 20 MW
Generators5in service
Net generation156GWh12 mo to Dec 2025
Capacity factor89%hydro units, summer MW
Heat rate—thermal plants only
First online1932
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 167.8 | 96.3% | — |
| 2002 | 145.2 | 83.3% | — |
| 2003 | 151 | 86.6% | — |
| 2004 | 167.4 | 95.7% | — |
| 2005 | 169.7 | 97.3% | — |
| 2006 | 162.4 | 88.7% | — |
| 2007 | 151.1 | 86.2% | — |
| 2008 | 171 | 97.4% | — |
| 2009 | 166.6 | 95.1% | — |
| 2010 | 164.6 | 89.5% | — |
| 2011 | 155.9 | 87.7% | — |
| 2012 | 173 | 97.0% | — |
| 2013 | 166.4 | 93.6% | — |
| 2014 | 158.8 | 89.3% | — |
| 2015 | 158.9 | 89.4% | — |
| 2016 | 153.2 | 85.9% | — |
| 2017 | 155.6 | 87.5% | — |
| 2018 | 144.7 | 81.4% | — |
| 2019 | 146.5 | 82.4% | — |
| 2020 | 148.4 | 82.0% | — |
| 2021 | 146.4 | 81.1% | — |
| 2022 | 146.2 | 81.0% | — |
| 2023 | 162.7 | 90.2% | — |
| 2024 | 155.2 | 85.8% | — |
| 2025 | 156 | 89.1% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 6.2 | 5.1 | Oct 1951 | Operating | — | coming soon |
| 10 | Conventional Hydroelectric | HY | 2.6 | 2 | Jul 1932 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 6.2 | 5.2 | Nov 1951 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 6.2 | 5.2 | Jan 1952 | Operating | — | coming soon |
| 3A | Conventional Hydroelectric | HY | 2.5 | 2.5 | Feb 1954 | Operating | — | coming soon |
Owner / operator
Operator: USACE-Detroit District. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| USACE-Detroit District | 100.0% | 24 MW |
Nearby plants
Within 80 km.
| Edison Sault | 42 MW | 1.6 km |
| Dafter | 11 MW | 15.6 km |
| Pickford Solar | 7 MW | 35.2 km |
| Detour | 6 MW | 67.3 km |