Guernsey
Platte County, Wyoming · EIA plant ID 4178 · Operator: U S Bureau of Reclamation
Nameplate6MWSummer 6 MW
Generators2in service
Net generation15GWh12 mo to Dec 2025
Capacity factor26%hydro units, summer MW
Heat rate—thermal plants only
First online1927
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 | 19.4 | 34.7% | — |
| 2002 | 10.6 | 19.0% | — |
| 2003 | 4 | 7.2% | — |
| 2004 | 9.8 | 17.3% | — |
| 2005 | 10.1 | 17.9% | — |
| 2006 | 15.3 | 27.3% | — |
| 2007 | 16 | 28.6% | — |
| 2008 | 17.8 | 31.7% | — |
| 2009 | 15.4 | 27.5% | — |
| 2010 | 20.6 | 36.7% | — |
| 2011 | 25.9 | 46.1% | — |
| 2012 | 18.2 | 32.4% | — |
| 2013 | 8.7 | 15.5% | — |
| 2014 | 15.8 | 28.2% | — |
| 2015 | 18.1 | 32.3% | — |
| 2016 | 17.9 | 31.9% | — |
| 2017 | 12 | 21.4% | — |
| 2018 | 16.2 | 28.8% | — |
| 2019 | 20.3 | 36.3% | — |
| 2020 | 20.6 | 36.6% | — |
| 2021 | 14.7 | 26.2% | — |
| 2022 | 13.6 | 24.3% | — |
| 2023 | 18.5 | 33.0% | — |
| 2024 | 18 | 32.1% | — |
| 2025 | 14.6 | 26.0% | — |
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 | 3.2 | 3.2 | Jul 1927 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 3.2 | 3.2 | Jan 1928 | 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% | 6 MW |
Nearby plants
Within 80 km.
| Laramie River Station | 1,863 MW | 22.5 km |
| Glendo | 38 MW | 25.4 km |
| Goshen Solar | — | 53 km |