How big is Rosamond South 1?

Rosamond South 1 has a reported capacity of 257 MW and an energy capacity of 468 MWh. Source: EIA Form 860.

What kind of plant is Rosamond South 1?

Rosamond South 1 is a Solar Photovoltaic, Batteries facility in Kern County, CA, participating in the CAISO market.

Where is Rosamond South 1 located?

Rosamond South 1 is in Kern County, CA, inside the CAISO balancing area.

Who operates Rosamond South 1?

Rosamond South 1 is operated by Golden Fields Solar IV, LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Rosamond South 1 generate?

Rosamond South 1 reported 281.5 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

How does Rosamond South 1 compare to other plants?

By capacity, Rosamond South 1 ranks #336 of 7,234 operating plants of the same technology nationally. It ranks #59 of 939 in CA.

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Solar Photovoltaic, BatteriesCAISO · Kern County

Rosamond South 1

Golden Fields Solar IV, LLC · Kern County · CAISO

Rosamond South 1 is a hybrid solar and battery storage facility with 257 MW of EIA-reported total operating capacity and 468 MWh of reported storage energy capacity in Kern County, California, registered as EIA Plant ID 67764. Golden Fields Solar IV, LLC owns and operates the plant, a subsidiary of Clearway Energy Group, LLC. Commercial operation began on November 5, 2025.

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Overview

Key fields

Generation / storage: 257 MW total / 468 MWh storage
Reported plant capacity and configuration.
Technology: Solar + battery storage
Primary generation technology.
Registry anchor: Plant 67764
Golden Fields Solar IV, LLC · Kern County · CAISO
Storage duration: 4 hours

Asset analyst

plant:plant-67764

Ask about Rosamond South 1

Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.

Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
RBESS	117 MW 117 MW summer	Batteries Electricity used for energy storage · BA	Aug 2025	Operating
RS1	140 MW 140 MW summer	Solar Photovoltaic Solar · PV	Aug 2025	Operating

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Transactions and agreements

Long-Term Offtake Agreements

Aug 26, 2024

Rosamond South 1 under 15-year agreements with MCE, University of California, Rancho Cucamonga Municipal Utility, Eastside Power Authority, and City of Moreno Valley as announced at financing close.

15 yearsGolden Fields Solar IV LLC · MCE · The University of California · Rancho Cucamonga Municipal Utility · Eastside Power Authority · City of Moreno Valley

Clearway Closes Financing and Starts Construction on Solar and Energy Storage Project in California - Clearway Energy

PPA Execution

2023

Execution-version PPA names Golden Fields Solar IV LLC as seller for dedicated 10 MW AC photovoltaic facility. 15-year delivery term; Buyer's Fraction 60%.

10 MW contracted15 yearsGolden Fields Solar IV LLC · City of Moreno Valley

Source

EPC Appointment

Aug 26, 2024

Clearway identified McCarthy Building Companies, Inc. as engineering, procurement, and construction contractor leading Rosamond South I construction.

Clearway Energy Group · McCarthy Building Companies, Inc.

Clearway Closes Financing and Starts Construction on Solar and Energy Storage Project in California - Clearway Energy

Commercial Operations And Offtake Confirmation

Nov 5, 2025

Clearway announced Rosamond South 1 reached commercial operations on November 5, 2025. 117 MW storage and 140 MW solar complex under long-term contracts with MCE, University of California, Rancho Cucamonga, Eastside Power Authority, City of Moreno Valley, and Constellation Energy.

Golden Fields Solar IV LLC · MCE · The University of California · Rancho Cucamonga Municipal Utility · Eastside Power Authority · City of Moreno Valley · Constellation Energy

Clearway Brings Online Grid-Enhancing Rosamond South Energy Center in California - Clearway Energy

Land and environmental record

Environmental Review And Approval

Dec 13, 2022

SCH No. 2021060079; certified EIR with mitigation measures, mitigation monitoring, findings, and Statement of Overriding Considerations

Kern County Board of Supervisors approved Rosamond South Solar Project on December 13, 2022. EIR prepared with mitigation measures and monitoring plan adopted.

Rosamond South Solar Project - CEQAnet

Environmental-Compliance Milestone And Operating Status

Nov 5, 2025

Commercial operations reached November 5, 2025

Clearway announced Rosamond South 1 reached commercial operations. Operating configuration: 140 MW solar and 117 MW battery-storage matching supplied 257 MW capacity.

Clearway Brings Online Grid-Enhancing Rosamond South Energy Center in California - Clearway Energy

Project Land Area And Parcels

Dec 15, 2022

1,302 acres across 66 privately owned parcels

Approved CEQA project record describes four-site Rosamond South project occupying approximately 1,302 acres across 66 privately owned parcels. This is project-level acreage not separately allocated to Rosamond South 1 phase.

Rosamond South Solar Project - CEQAnet

Overview

Key fields

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Overview

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Structured profile

Units and generators

Performance

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Monthly generation

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Commercial, land, and environmental record

Transactions and agreements

Land and environmental record

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Parties and identifiers

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Timeline and sources

Project timeline

Sources

Common questions about Rosamond South 1

How big is Rosamond South 1?

What kind of plant is Rosamond South 1?

Where is Rosamond South 1 located?

Who operates Rosamond South 1?

How much electricity does Rosamond South 1 generate?

How does Rosamond South 1 compare to other plants?

Co-located assets

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