Seminoe
Carbon County, Wyoming · EIA plant ID 4182 · Operator: U S Bureau of Reclamation
Nameplate52MWSummer 52 MW
Generators3in service
Net generation85GWh12 mo to Dec 2025
Capacity factor19%hydro units, summer MW
Heat rate—thermal plants only
First online1939
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 | 117.4 | 26.0% | — |
| 2002 | 64.9 | 14.4% | — |
| 2003 | 64.7 | 14.3% | — |
| 2004 | 61.9 | 13.7% | — |
| 2005 | 109.6 | 24.2% | — |
| 2006 | 99.9 | 22.1% | — |
| 2007 | 96.8 | 21.4% | — |
| 2008 | 117.6 | 25.9% | — |
| 2009 | 160.1 | 35.4% | — |
| 2010 | 156.9 | 34.7% | — |
| 2011 | 189.6 | 41.9% | — |
| 2012 | 118.3 | 26.1% | — |
| 2013 | 90.4 | 20.0% | — |
| 2014 | 119.6 | 26.5% | — |
| 2015 | 125.2 | 27.7% | — |
| 2016 | 138.3 | 30.5% | — |
| 2017 | 128.5 | 28.4% | — |
| 2018 | 104.9 | 23.2% | — |
| 2019 | 141.2 | 31.2% | — |
| 2020 | 135.7 | 29.9% | — |
| 2021 | 91.1 | 20.2% | — |
| 2022 | 55 | 12.2% | — |
| 2023 | 140.7 | 31.1% | — |
| 2024 | 137 | 30.2% | — |
| 2025 | 84.5 | 18.7% | — |
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 | 17.2 | 17.2 | Aug 1939 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 17.2 | 17.2 | Aug 1939 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 17.2 | 17.2 | Aug 1939 | Operating | — | coming soon |
Owner / operator
Operator: U S Bureau of Reclamation. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| U S Bureau of Reclamation | 100.0% | 52 MW |
Nearby plants
Within 80 km.
| Kortes | 36 MW | 3.1 km |
| Fremont Canyon | 67 MW | 36.8 km |
| Sinclair Oil Refinery | 5 MW | 45.1 km |
| Alcova | 41 MW | 46.4 km |
| Seven Mile Hill | 146 MW | 51.2 km |
| Ekola Flats | 251 MW | 51.8 km |