Guernsey
Hydro power plant in Platte County, Wyoming. 6.4 MW of nameplate capacity across 2 generators, operated by U S Bureau of Reclamation.
Also known as EIA plant 4178
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 6.4 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- July 1927First generator online
- Operator
- U S Bureau of ReclamationEIA operator ID 2518
- Grid
- WAUWBalancing authority WAUW
- Price nodes
- 1 SPP nodeResource nodes with prices
- Location
- Platte County, WY42.2899, −104.7606
- EIA plant ID
- 4178EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Guernsey produces
Free · EIA-923Net generation, 2025
14.6 GWh
14,570 MWh, final
Capacity factor, 2025
26.0%
2024: 32.1%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
12.0–20.6
GWh a year. Low 2017, high 2020
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 24,049 | Not reported | 12 of 12 |
| 2001 | 19,430 | Not reported | 12 of 12 |
| 2002 | 10,640 | Not reported | 12 of 12 |
| 2003 | 4,028 | Not reported | 12 of 12 |
| 2004 | 9,755 | Not reported | 12 of 12 |
| 2005 | 10,060 | Not reported | 12 of 12 |
| 2006 | 15,326 | Not reported | 12 of 12 |
| 2007 | 16,021 | Not reported | 12 of 12 |
| 2008 | 17,807 | Not reported | 12 of 12 |
| 2009 | 15,405 | Not reported | 12 of 12 |
| 2010 | 20,580 | 36.7% | 12 of 12 |
| 2011 | 25,853 | 46.1% | 12 of 12 |
| 2012 | 18,207 | 32.4% | 12 of 12 |
| 2013 | 8,711 | 15.5% | 12 of 12 |
| 2014 | 15,838 | 28.2% | 12 of 12 |
| 2015 | 18,089 | 32.3% | 12 of 12 |
| 2016 | 17,942 | 31.9% | 12 of 12 |
| 2017 | 12,004 | 21.4% | 12 of 12 |
| 2018 | 16,165 | 28.8% | 12 of 12 |
| 2019 | 20,321 | 36.2% | 12 of 12 |
| 2020 | 20,572 | 36.6% | 12 of 12 |
| 2021 | 14,692 | 26.2% | 12 of 12 |
| 2022 | 13,620 | 24.3% | 12 of 12 |
| 2023 | 18,515 | 33.0% | 12 of 12 |
| 2024 | 18,041 | 32.1% | 12 of 12 |
| 2025 | 14,570 | 26.0% | 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 | 3.2 | July 1927 |
| 2 | Conventional Hydroelectric | 3.2 | January 1928 |
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 U S Bureau of Reclamation 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 Guernsey
More plants operated by U S Bureau of Reclamation
Questions about Guernsey
How much power does Guernsey produce?
Guernsey reported 14,570 MWh (14.6 GWh) of net generation in 2025, a 26.0% capacity factor on 6.4 MW of nameplate capacity.
Where is Guernsey?
Guernsey is in Platte County, Wyoming, at 42.2899, −104.7606. It is in the Western Area Power Administration UGP West balancing area (WAUW).
Who operates Guernsey?
EIA-860M for August 2026 lists U S Bureau of Reclamation as the operator (EIA operator ID 2518). The operator is not always the owner.
When did Guernsey start operating?
Its first generator began operating in July 1927, according to EIA-860M.
Does InfraMap have power prices for Guernsey?
Yes. InfraMap has SPP day-ahead and real-time prices at 1 price node linked to Guernsey, 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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page