Castle Solar, LLC
Solar power plant in Emery County, Utah. 40 MW of nameplate capacity across 1 generator, operated by Castle Solar, LLC.
Also known as EIA plant 64740
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 40 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- April 2024First generator online
- Operator
- Castle Solar, LLCEIA operator ID 64307
- Grid
- PACEBalancing authority PACE
- Price nodes
- None linkedNo verified ISO node
- Location
- Emery County, UT39.3344, −110.9907
- EIA plant ID
- 64740EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Castle Solar produces
Free · EIA-923Net generation, 2025
108 GWh
107,994 MWh, final
Capacity factor, 2025
30.8%
2024: Not reported
January to July 2026
68.7 GWh
Provisional
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | Not reported | Not reported | 0 of 12 |
| 2021 | Not reported | Not reported | 0 of 12 |
| 2022 | Not reported | Not reported | 0 of 12 |
| 2023 | Not reported | Not reported | 0 of 12 |
| 2024 | 85,608 | Not reported | 9 of 12 |
| 2025 | 107,994 | 30.8% | 12 of 12 |
| 2026 (provisional, partial year) | 68,749 | 33.8% | 7 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 accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
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 |
|---|---|---|---|
| CS | Solar Photovoltaic | 40.0 | April 2024 |
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 Castle Solar, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
300 analyst questions a month, plus MCP
Query Castle Solar, LLC and 14,224 other projects from Claude or your own tools. Free accounts get 1 question a day.
Power plants near Castle Solar
Questions about Castle Solar
How much power does Castle Solar, LLC produce?
Castle Solar, LLC reported 107,994 MWh (108 GWh) of net generation in 2025, a 30.8% capacity factor on 40 MW of nameplate capacity. From January to July 2026 it reported 68.7 GWh, which is provisional.
Where is Castle Solar, LLC?
Castle Solar, LLC is in Emery County, Utah, at 39.3344, −110.9907. It is in the PacifiCorp - East balancing area (PACE).
Who operates Castle Solar, LLC?
EIA-860M for August 2026 lists Castle Solar, LLC as the operator (EIA operator ID 64307). The operator is not always the owner.
When did Castle Solar, LLC start operating?
Its first generator began operating in April 2024, according to EIA-860M.
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)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page