Garrison
Hydro power plant in Mercer County, North Dakota. 583.4 MW of nameplate capacity across 5 generators, operated by USACE-Omaha.
Also known as Garrison Dam Powerhouse · EIA plant 2815
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 583.4 MWNameplate
- Generators
- 5 operatingEIA-860M, August 2026
- Operating since
- January 1956First generator online
- Operator
- USACE-OmahaEIA operator ID 19635
- Grid
- SPPBalancing authority SWPP
- Price nodes
- 2 SPP nodesResource nodes with prices
- Location
- Mercer County, ND47.4945, −101.4115
- EIA plant ID
- 2815EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Garrison produces
Free · EIA-923Net generation, 2025
2.00 TWh
2,004,511 MWh, final
Capacity factor, 2025
39.2%
2024: 40.2%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
1.8–3.2
TWh a year. Low 2022, high 2018
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 2,122,561 | Not reported | 12 of 12 |
| 2001 | 1,332,076 | Not reported | 12 of 12 |
| 2002 | 1,592,616 | Not reported | 12 of 12 |
| 2003 | 1,723,904 | Not reported | 12 of 12 |
| 2004 | 1,545,864 | Not reported | 12 of 12 |
| 2005 | 1,341,824 | Not reported | 12 of 12 |
| 2006 | 1,521,034 | Not reported | 12 of 12 |
| 2007 | 1,305,393 | Not reported | 12 of 12 |
| 2008 | 1,252,790 | Not reported | 12 of 12 |
| 2009 | 1,475,251 | Not reported | 12 of 12 |
| 2010 | 2,042,118 | 38.0% | 12 of 12 |
| 2011 | 2,580,042 | 48.0% | 12 of 12 |
| 2012 | 2,477,230 | 45.9% | 12 of 12 |
| 2013 | 1,852,421 | 34.4% | 12 of 12 |
| 2014 | 2,531,360 | 47.1% | 12 of 12 |
| 2015 | 2,094,168 | 38.9% | 12 of 12 |
| 2016 | 1,912,005 | 35.5% | 12 of 12 |
| 2017 | 2,582,107 | 48.0% | 12 of 12 |
| 2018 | 3,180,154 | 59.1% | 12 of 12 |
| 2019 | 3,179,292 | Not reported | 12 of 12 |
| 2020 | 2,450,395 | 47.8% | 12 of 12 |
| 2021 | 1,989,053 | 38.9% | 12 of 12 |
| 2022 | 1,791,409 | 35.1% | 12 of 12 |
| 2023 | 2,119,102 | 41.5% | 12 of 12 |
| 2024 | 2,060,635 | 40.2% | 12 of 12 |
| 2025 | 2,004,511 | 39.2% | 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 account · SPPEmissions
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 | 121.6 | January 1956 |
| 2 | Conventional Hydroelectric | 121.6 | March 1956 |
| 3 | Conventional Hydroelectric | 121.6 | August 1956 |
| 4 | Conventional Hydroelectric | 109.3 | March 1960 |
| 5 | Conventional Hydroelectric | 109.3 | May 1960 |
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-Omaha 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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Power plants near Garrison
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Questions about Garrison
How much power does Garrison produce?
Garrison reported 2,004,511 MWh (2.00 TWh) of net generation in 2025, a 39.2% capacity factor on 583.4 MW of nameplate capacity.
Where is Garrison?
Garrison is in Mercer County, North Dakota, at 47.4945, −101.4115. It is in the Southwest Power Pool balancing area (SWPP).
Who operates Garrison?
EIA-860M for August 2026 lists USACE-Omaha as the operator (EIA operator ID 19635). The operator is not always the owner.
When did Garrison start operating?
Its first generator began operating in January 1956, according to EIA-860M.
Does InfraMap have power prices for Garrison?
Yes. InfraMap has SPP day-ahead and real-time prices at 2 price nodes linked to Garrison, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
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)
- SPP day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page