Rosamond South 1
Solar and battery storage project in Kern County, California. 257 MW of nameplate capacity across 2 generators, operated by Golden Fields Solar IV, LLC.
Also known as EIA plant 67764
This project groups Rosamond South 1 (EIA 67764). EIA reports them as separate plants.
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 257 MWSolar 140.0 · Battery storage 117.0
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- August 2025First generator online
- Operator
- Golden Fields Solar IV, LLCEIA operator ID 66365
- Grid
- CAISOBalancing authority CISO
- Price nodes
- 6 CAISO nodesResource nodes with prices
- Location
- Kern County, CA34.8425, −118.3785
- EIA plant ID
- 67764EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Rosamond South 1 produces
Free · EIA-923Net generation, 2025
157 GWh
157,426 MWh, final. 5 of 12 months reported
Capacity factor, 2025
Not reported
2024: Not reported
January to July 2026
258 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 | Not reported | Not reported | 0 of 12 |
| 2025 | 157,426 | Not reported | 5 of 12 |
| 2026 (provisional, partial year) | 257,560 | 38.4% | 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 account · CAISOEmissions
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 |
|---|---|---|---|
| RBESS | Batteries | 117.0 | August 2025 |
| RS1 | Solar Photovoltaic | 140.0 | August 2025 |
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 Golden Fields Solar IV, 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.
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Questions about Rosamond South 1
How much power does Rosamond South 1 produce?
Rosamond South 1 reported 157,426 MWh (157 GWh) of net generation in 2025. From January to July 2026 it reported 258 GWh, which is provisional. 5 of 12 months were reported for 2025.
Where is Rosamond South 1?
Rosamond South 1 is in Kern County, California, at 34.8425, −118.3785. It is in the California Independent System Operator balancing area (CISO).
Who operates Rosamond South 1?
EIA-860M for August 2026 lists Golden Fields Solar IV, LLC as the operator (EIA operator ID 66365). The operator is not always the owner.
Is Rosamond South 1 a solar or a battery storage plant?
Both. Solar capacity totals 140 MW and battery storage capacity totals 117 MW.
When did Rosamond South 1 start operating?
Its first generator began operating in August 2025, according to EIA-860M.
Does InfraMap have power prices for Rosamond South 1?
Yes. InfraMap has CAISO day-ahead and real-time prices at 6 price nodes linked to Rosamond South 1, 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)
- CAISO 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