Garrison
Mercer County, North Dakota · EIA plant ID 2815 · Operator: USCE-Missouri River District
Nameplate583MWSummer 510 MW
Generators5in service
Net generation2,005GWh12 mo to Dec 2025
Capacity factor45%hydro units, summer MW
Heat rate—thermal plants only
First online1956
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 | 1,332.1 | 30.6% | — |
| 2002 | 1,592.6 | 36.6% | — |
| 2003 | 1,723.9 | 53.0% | — |
| 2004 | 1,545.9 | 36.3% | — |
| 2005 | 1,341.8 | 35.5% | — |
| 2006 | 1,521 | 39.2% | — |
| 2007 | 1,305.4 | 30.7% | — |
| 2008 | 1,252.8 | 29.3% | — |
| 2009 | 1,475.3 | 33.1% | — |
| 2010 | 2,042.1 | 45.9% | — |
| 2011 | 2,580 | 58.0% | — |
| 2012 | 2,477.2 | 55.5% | — |
| 2013 | 1,852.4 | 41.5% | — |
| 2014 | 2,531.4 | 56.7% | — |
| 2015 | 2,094.2 | 46.9% | — |
| 2016 | 1,912 | 42.7% | — |
| 2017 | 2,582.1 | 57.8% | — |
| 2018 | 3,180.2 | 71.2% | — |
| 2019 | 3,179.3 | 71.2% | — |
| 2020 | 2,450.4 | 54.7% | — |
| 2021 | 1,989.1 | 44.5% | — |
| 2022 | 1,791.4 | 40.1% | — |
| 2023 | 2,119.1 | 47.4% | — |
| 2024 | 2,060.6 | 46.0% | — |
| 2025 | 2,004.5 | 44.9% | — |
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 | 121.6 | 102 | Jan 1956 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 121.6 | 102 | Mar 1956 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 121.6 | 102 | Aug 1956 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 109.3 | 102 | Mar 1960 | Operating | — | coming soon |
| 5 | Conventional Hydroelectric | HY | 109.3 | 102 | May 1960 | Operating | — | coming soon |
Owner / operator
Operator: USCE-Missouri River District. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| USCE-Missouri River District | 100.0% | 583 MW |
Nearby plants
Within 80 km.
| Coal Creek | 1,216 MW | 23.1 km |
| Leland Olds | 656 MW | 24.7 km |
| Antelope Valley | 954 MW | 34.8 km |
| FPL Energy Oliver Wind II LLC | 48 MW | 41.3 km |
| FPL Energy Oliver Wind I LLC | 51 MW | 41.3 km |
| Coyote | 450 MW | 43 km |