Saint Marys Falls
Hydro power plant in Chippewa County, Michigan. 23.7 MW of nameplate capacity across 5 generators, operated by USACE-Detroit District.
Also known as Saint Marys Falls Power Plant · Soo Locks Dam · EIA plant 1865
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 23.7 MWNameplate
- Generators
- 5 operatingEIA-860M, August 2026
- Operating since
- July 1932First generator online
- Operator
- USACE-Detroit DistrictEIA operator ID 21264
- Grid
- MISOBalancing authority MISO
- Price nodes
- None linkedNo verified ISO node
- Location
- Chippewa County, MI46.5063, −84.3493
- EIA plant ID
- 1865EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Saint Marys Falls produces
Free · EIA-923Net generation, 2025
156 GWh
156,043 MWh, final
Capacity factor, 2025
75.2%
2024: 74.5%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
144.7–162.7
GWh a year. Low 2018, high 2023
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 0 | Not reported | 12 of 12 |
| 2001 | 167,839 | Not reported | 12 of 12 |
| 2002 | 145,175 | Not reported | 12 of 12 |
| 2003 | 151,014 | Not reported | 12 of 12 |
| 2004 | 167,355 | Not reported | 12 of 12 |
| 2005 | 169,676 | Not reported | 12 of 12 |
| 2006 | 162,402 | Not reported | 12 of 12 |
| 2007 | 151,069 | Not reported | 12 of 12 |
| 2008 | 171,043 | Not reported | 12 of 12 |
| 2009 | 166,586 | Not reported | 12 of 12 |
| 2010 | 164,569 | Not reported | 12 of 12 |
| 2011 | 155,920 | 75.1% | 12 of 12 |
| 2012 | 172,952 | 83.1% | 12 of 12 |
| 2013 | 166,395 | 80.1% | 12 of 12 |
| 2014 | 158,761 | 76.5% | 12 of 12 |
| 2015 | 158,943 | 76.6% | 12 of 12 |
| 2016 | 153,169 | 73.6% | 12 of 12 |
| 2017 | 155,632 | 75.0% | 12 of 12 |
| 2018 | 144,714 | 69.7% | 12 of 12 |
| 2019 | 146,465 | 70.5% | 12 of 12 |
| 2020 | 148,445 | 71.3% | 12 of 12 |
| 2021 | 146,382 | 70.5% | 12 of 12 |
| 2022 | 146,181 | 70.4% | 12 of 12 |
| 2023 | 162,729 | 78.4% | 12 of 12 |
| 2024 | 155,166 | 74.5% | 12 of 12 |
| 2025 | 156,043 | 75.2% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 6.2 | October 1951 |
| 2 | Conventional Hydroelectric | 6.2 | November 1951 |
| 3 | Conventional Hydroelectric | 6.2 | January 1952 |
| 3A | Conventional Hydroelectric | 2.5 | February 1954 |
| 10 | Conventional Hydroelectric | 2.6 | July 1932 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists USACE-Detroit District as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Questions about Saint Marys Falls
How much power does Saint Marys Falls produce?
Saint Marys Falls reported 156,043 MWh (156 GWh) of net generation in 2025, a 75.2% capacity factor on 23.7 MW of nameplate capacity.
Where is Saint Marys Falls?
Saint Marys Falls is in Chippewa County, Michigan, at 46.5063, −84.3493. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Saint Marys Falls?
EIA-860M for August 2026 lists USACE-Detroit District as the operator (EIA operator ID 21264). The operator is not always the owner.
When did Saint Marys Falls start operating?
Its first generator began operating in July 1932, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page