Proxima — 352 MW hybrid plant, Stanislaus County, CA

Proxima — 352 MW hybrid plant, Stanislaus County, CA · Ask the Grid

Generation and physical site

EIA plant 66270 · Inventory for Sep 2026.

Reported operating nameplate by technology

Battery storage: 162 MW
Solar: 190 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (2)

EIA generator status and nameplate capacity for Proxima
Generator	Technology	Status	Power (MW)	Energy (MWh)
PRXBS	Batteries	Operating	162	648
PRXMA	Solar Photovoltaic	Operating	190	Unknown

Physical map location · OpenStreetMap: 37.40143, -121.15577
Filed location · EIA: 37.40035, -121.16280

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Sep 2026
EIA retrieved: Oct 24, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: May 18, 2026
Map prepared: Oct 24, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Units and generators

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

Generator	Capacity	Technology	Operation	Status
PRXBS	162 MW 162 MW summer	Batteries BA	Apr 2024	Operating
PRXMA	190 MW 190 MW summer	Solar Photovoltaic PV	Jun 2024	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

PPA Execution And Amendment

Sep 24, 2018

For EIA Form 860 plant ID 66270, Sonoma Clean Power Authority's 20-year Proxima solar-plus-storage power contract was executed on September 24, 2018. The contract was amended on January 21, 2022, adding 20 MW of solar and 27 MW of storage, resulting in 70 MW of contracted solar and 32 MW / 128 MWh of storage. The reported delivery period was April 1, 2024 through March 31, 2044.

70 MW contracted20 yearsSonoma Clean Power Authority · Proxima Solar, LLC

PUBLIC Sonoma Clean Power Final 2023 RPS Procurement Plan_FINAL_CLEAN_Redacted.pdf

Land and environmental record

Environmental Compliance Milestone

Mar 29, 2021

Permit Application No. PLN2020-0061; State Clearinghouse No. 2021060330; approved March 29, 2021

The 2021 Proxima Solar Energy Center modification changed the approved layout and operational infrastructure and expanded the approved facility footprint by 25 percent. The County relied on a February 2021 Mitigated Negative Declaration Addendum and recorded no significant environmental impact.

Staff Approval Permit Application No. PLN2020-0061 - Proxima Solar Energy Center

Environmental Permit

Apr 19, 2012

Use Permit Application No. March 2010; State Clearinghouse No. 2011012006; Mitigated Negative Declaration

Stanislaus County Planning Commission approved the original Fink Road Solar Farm on April 19, 2012. The CEQA record reports no significant environmental impact, a Mitigated Negative Declaration, adopted mitigation measures, and CEQA findings.

Use Permit Application No. 2010-03 - Fink Road Solar Farm

Interconnection Environmental Review

Apr 14, 2022

PG&E Proxima Solar Interconnection & Fink Switching Station Project; Advice Letter 6529-E; T. No. 0003770; SAP Order No. 74017045

PG&E proposed an approximately 6-acre switching station and approximately 1,600 feet of transmission-line rerouting for the Proxima interconnection. The project was exempt from a separate CPUC authority-to-construct application under CPUC General Order 131-D because of the applicable CEQA review and minor-relocation provisions.

Pacific Gas & Electric Company ELC (Corp ID 39) Status of Advice Letter 6529E Disposition: Accepted Effective Date: 04-14-2022

Land Lease

2017

Approximately 1,600 acres of County-owned land leased for the solar project

Stanislaus County entered into a land option and lease agreement for County-owned land adjacent to the Fink Road Landfill. The agreement was assigned to Proxima Solar, LLC in September 2017.

Source

Original Project Water Infrastructure

2012

Original project design included a 100,000-gallon water tank for a 1-MW thermal steam-storage facility

The 2012 environmental project description included a 100,000-gallon water tank, engine room, and condensing unit within a metal structure. This is an original permitted-design feature and is not presented as confirmation of the final operating configuration.

Source

Mapped facility footprint

Mapped infrastructure geometry associated with this asset.© OpenStreetMap contributors · relation/20059768

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Dec 8, 2009
Dec 8, 2009
Original Fink Road Solar Farm developmentSource
Stanislaus County selected JKB Development for a 12-month exclusive right to negotiate a long-term farming and potential solar-farm lease for the Fink Road site.
Sep 2017
Sep 2017
Lease/project-rights assignment to ProximaSource
The County record states that the Golden Hills Solar, LLC agreement was assigned to Proxima Solar, LLC. The record documents an assignment, not a sale, and gives no transaction consideration.
Mar 29, 2021
Mar 29, 2021
Permit amendment and project renamingStaff Appro...
Stanislaus County approved an amendment to Use Permit No. March 2010 for the Fink Road Solar Farm, identified in the CEQA record as the Proxima Solar Energy Center.
View 1 more milestoneHide 1 milestone
1. Jan 2022
  Jan 2022
  NextEra Lease-Option ExerciseSource
  NextEra Energy Resources, identified by the County as the parent company of Proxima Solar, LLC, began exercising its options to lease the site so construction could be initiated.
Mar 16, 2022
Mar 16, 2022
Interconnection Construction NoticePacific Gas...
PG&E submitted its notice of construction for the Proxima Solar Interconnection and Fink Switching Station Project. Construction was tentatively scheduled for June 2022, with completion targeted for January 2023.
Apr 2024
Apr 2024
Generator enters operationEIA-860
EIA-860 lists generator PRXBS with this operating date.
Jun 2024
Jun 2024
Generator enters operationEIA-860
EIA-860 lists generator PRXMA with this operating date.

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

nexteraenergyresources.comNextEra Energy Resourcesother

Common questions about Proxima

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is Proxima?

Proxima reports 162 MW battery storage + 190 MW solar of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.

What kind of plant is Proxima?

Proxima is a Solar Photovoltaic, Batteries facility in Stanislaus County, CA, participating in the CAISO market.

Where is Proxima located?

Proxima is in Stanislaus County, CA, inside the CAISO balancing area.

Who operates Proxima?

Proxima is operated by Proxima Solar, LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Proxima generate?

Proxima reported 466.9 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.

Where does Proxima connect to the grid?

Proxima interconnects at Fink Switching Station (FINK SW STA–PROXIMA SOLAR), on the Pacific Gas and Electric Company (PG&E) system.

How does Proxima compare to other plants?

By capacity, Proxima ranks #223 of 7,597 operating plants of the same technology nationally. It ranks #37 of 972 in CA.

Co-located assets

Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.

Frontier Solar LLCSolar PhotovoltaicSolar Photovoltaic20 MW3.3 km PaulsellBatteries, Solar PhotovoltaicBatteries, Solar Photovoltaic35 MW3.5 km Central 40Solar PhotovoltaicSolar Photovoltaic40 MW18 km

Overview

Overview

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Generation and physical site

Reported operating nameplate by technology

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