Boysen
Fremont County, Wyoming · EIA plant ID 505 · Operator: U S Bureau of Reclamation
Nameplate15MWSummer 17 MW
Generators2in service
Net generation42GWh12 mo to Dec 2025
Capacity factor28%hydro units, summer MW
Heat rate—thermal plants only
First online1952
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 | 39.4 | 26.2% | — |
| 2002 | 28.2 | 18.7% | — |
| 2003 | 25.4 | 16.9% | — |
| 2004 | 31.1 | 20.6% | — |
| 2005 | 64.1 | 42.6% | — |
| 2006 | 50.6 | 33.6% | — |
| 2007 | 36 | 23.9% | — |
| 2008 | 46.2 | 30.6% | — |
| 2009 | 69.7 | 46.3% | — |
| 2010 | 71.9 | 47.7% | — |
| 2011 | 47.6 | 31.6% | — |
| 2012 | 38.1 | 25.3% | — |
| 2013 | 30.6 | 20.3% | — |
| 2014 | 69.5 | 46.1% | — |
| 2015 | 65.5 | 43.5% | — |
| 2016 | 67.5 | 44.7% | — |
| 2017 | 88.9 | 59.0% | — |
| 2018 | 73.8 | 49.0% | — |
| 2019 | 69.7 | 46.3% | — |
| 2020 | 66 | 43.7% | — |
| 2021 | 47.5 | 31.5% | — |
| 2022 | 61.2 | 40.6% | — |
| 2023 | 81.3 | 54.0% | — |
| 2024 | 70.3 | 46.5% | — |
| 2025 | 42.5 | 28.2% | — |
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 | 7.5 | 8.6 | Aug 1952 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 7.5 | 8.6 | Sep 1952 | 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% | 15 MW |
Nearby plants
Within 80 km.
| Pilot Butte | 2 MW | 54.1 km |
| Beaver Creek Gas Plant | 7 MW | 64.4 km |
| Big Sand Draw Plant | 8 MW | 74 km |