# Proxima

CAISO Solar Photovoltaic, Batteries · https://askthegrid.com/assets/facilities/proxima

Proxima is a hybrid solar and battery storage facility with 352 MW of EIA-reported operating capacity in Stanislaus County, California, registered as EIA Plant ID 66270. NextEra Energy Resources is the public owner or developer; Proxima Solar, LLC is the registered plant entity or operator. Project filings list 430,000 solar panels for the facility. Its grid role is hybrid solar generation with battery storage; the battery record identifies arbitrage, ramping and spinning-reserve support, use of excess wind and solar generation, and direct support of the solar unit.

## Key facts

- Technology: Solar Photovoltaic, Batteries
- Power capacity: 352 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: California Independent System Operator (CISO)
- Substation: Fink Switching Station (FINK SW STA–PROXIMA SOLAR)
- Point of interconnection: Fink Switching Station (FINK SW STA–PROXIMA SOLAR)
- Transmission owner: Pacific Gas and Electric Company (PG&E)
- Interconnection voltage: 230 kV

## Source-backed facts

- Owner logo domain: nexteraenergyresources.com — Appendix C Physical, Environmental, Resilience Conditions · confidence: medium
- Owner logo domain: nexteraenergyresources.com — NextEra Energy Resources · confidence: medium
- Identifiers: [{"value":"66270","system":"EIA plant code"},{"value":"Proxima Solar, LLC","system":"EIA utility/operator name"},{"value":"PRXBS","system":"EIA generator ID"},{"value":"PRXMA","system":"EIA generator ID"},{"value":"54257 (plant); 54258 (PRXBS); 54259 (PRXMA)","system":"FERC MBR / EIA record IDs"},{"value":"CISO","system":"ISO/RTO balancing authority"},{"value":"CAISO","system":"ISO/RTO power market"},{"value":"1244","system":"CAISO interconnection request / queue position"},{"value":"C09","system":"CAISO queue cluster"},{"value":"PLN2020-0061","system":"Stanislaus County permit / CEQA application"},{"value":"6529-E","system":"PG&E advice letter"},{"value":"66270","system":"California Energy Commission cross-reference plant ID"}] — Public Queue Report · confidence: high
- Identifiers: [{"value":"66270","system":"EIA plant code"},{"value":"Proxima Solar, LLC","system":"EIA utility/operator name"},{"value":"PRXBS","system":"EIA generator ID"},{"value":"PRXMA","system":"EIA generator ID"},{"value":"54257 (plant); 54258 (PRXBS); 54259 (PRXMA)","system":"FERC MBR / EIA record IDs"},{"value":"CISO","system":"ISO/RTO balancing authority"},{"value":"CAISO","system":"ISO/RTO power market"},{"value":"1244","system":"CAISO interconnection request / queue position"},{"value":"C09","system":"CAISO queue cluster"},{"value":"PLN2020-0061","system":"Stanislaus County permit / CEQA application"},{"value":"6529-E","system":"PG&E advice letter"},{"value":"66270","system":"California Energy Commission cross-reference plant ID"}] — Notice of Determination · confidence: high
- Identifiers: [{"value":"66270","system":"EIA plant code"},{"value":"Proxima Solar, LLC","system":"EIA utility/operator name"},{"value":"PRXBS","system":"EIA generator ID"},{"value":"PRXMA","system":"EIA generator ID"},{"value":"54257 (plant); 54258 (PRXBS); 54259 (PRXMA)","system":"FERC MBR / EIA record IDs"},{"value":"CISO","system":"ISO/RTO balancing authority"},{"value":"CAISO","system":"ISO/RTO power market"},{"value":"1244","system":"CAISO interconnection request / queue position"},{"value":"C09","system":"CAISO queue cluster"},{"value":"PLN2020-0061","system":"Stanislaus County permit / CEQA application"},{"value":"6529-E","system":"PG&E advice letter"},{"value":"66270","system":"California Energy Commission cross-reference plant ID"}] — Pacific Gas & Electric Company ELC (Corp ID 39) Status of Advice Letter 6529E Disposition: Accepted Effective Date: 04-14-2022 · confidence: high
- Official project url: https://www.cei.com/our-work/proxima-solar — Proxima Solar | Cupertino Electric · confidence: high
- Owner name: NextEra Energy Resources — Appendix C Physical, Environmental, Resilience Conditions · confidence: medium
- Description: Proxima is an operational solar-and-battery power plant in Stanislaus County, California, with two generating units totaling 352 MW of nameplate capacity; its first unit came online on April 1, 2024. The plant is operated by Proxima Solar, LLC and participates in the CISO balancing authority and CAISO market. Cupertino Electric/CEI served as general or prime contractor, with project scope including approximately 252 MW of solar PV, a substation, SCADA systems, and a 148 MW battery energy storage system. — Proxima Solar | Cupertino Electric · confidence: medium
- Identifiers.4: {"value":"54257 (plant); 54258 (PRXBS); 54259 (PRXMA)","system":"FERC MBR / EIA record IDs"} — MBR | Index · confidence: high
- Identifiers.7: {"value":"1244","system":"CAISO interconnection request / queue position"} — Public Queue Report · confidence: high
- Identifiers.8: {"value":"C09","system":"CAISO queue cluster"} — Public Queue Report · confidence: medium
- Identifiers.9: {"value":"PLN2020-0061","system":"Stanislaus County permit / CEQA application"} — Notice of Determination · confidence: high
- Identifiers.10: {"value":"6529-E","system":"PG&E advice letter"} — Pacific Gas & Electric Company ELC (Corp ID 39) Status of Advice Letter 6529E Disposition: Accepted Effective Date: 04-14-2022 · confidence: high
- Parties.0: {"relationship":"Owner / developer","name":"NextEra Energy Resources","official_url":"https://www.nexteraenergyresources.com/"} — Appendix C Physical, Environmental, Resilience Conditions · confidence: medium
- Parties.2: {"relationship":"General / prime contractor","name":"CEI","official_url":"https://www.cei.com/"} — Proxima Solar | Cupertino Electric · confidence: high
- Construction scope: CEI served as general/prime contractor for the Proxima Solar project. The disclosed scope comprises roughly 430,000 solar panels producing 252 MW DC, a substation, a SCADA system, and a battery energy storage system. CEI reported the BESS at 148 MW; the operational plant record identifies two generating units: one 162 MW / 648 MWh lithium-ion battery generator and one 190 MW bifacial, single-axis-tracking solar PV generator, totaling 352 MW. — Proxima Solar | Cupertino Electric · confidence: medium
- Kind: solar — Proxima Solar | Cupertino Electric · confidence: medium
- Modules or panels: 430000 — Proxima Solar | Cupertino Electric · confidence: medium
- Description: Proxima is an operational solar-and-battery plant in Stanislaus County, California, with two generating units totaling 352 MW of nameplate capacity; its first unit came online on April 1, 2024. NextEra Energy Resources owns and developed the project, while Proxima Solar, LLC is the operating entity. The project traces its permitting and site history to the Fink Road Solar Farm, with the project lease assigned to Proxima Solar, LLC in September 2017 and NextEra beginning to exercise site-lease options in January 2022. Cupertino Electric/CEI served as general or prime contractor for the solar, substation, SCADA, and battery construction scope. — FLORIDA POWER & LIGHT COMPANY GENERATION PORTFOLIO · confidence: medium
- Description: Proxima is an operational solar-and-battery plant in Stanislaus County, California, with two generating units totaling 352 MW of nameplate capacity; its first unit came online on April 1, 2024. NextEra Energy Resources owns and developed the project, while Proxima Solar, LLC is the operating entity. The project traces its permitting and site history to the Fink Road Solar Farm, with the project lease assigned to Proxima Solar, LLC in September 2017 and NextEra beginning to exercise site-lease options in January 2022. Cupertino Electric/CEI served as general or prime contractor for the solar, substation, SCADA, and battery construction scope. — Staff Approval Permit Application No. PLN2020-0061 - Proxima Solar Energy Center · confidence: medium
- Description: Proxima is an operational solar-and-battery plant in Stanislaus County, California, with two generating units totaling 352 MW of nameplate capacity; its first unit came online on April 1, 2024. NextEra Energy Resources owns and developed the project, while Proxima Solar, LLC is the operating entity. The project traces its permitting and site history to the Fink Road Solar Farm, with the project lease assigned to Proxima Solar, LLC in September 2017 and NextEra beginning to exercise site-lease options in January 2022. Cupertino Electric/CEI served as general or prime contractor for the solar, substation, SCADA, and battery construction scope. — Proxima Solar | Cupertino Electric · confidence: medium
- Financing summary: NextEra's generation portfolio as of June 30, 2025 lists Proxima Solar at 190 MW and Proxima Energy Storage at 162 MW, each 100%-owned and classified as financed with DMI/Project Debt; the solar component receives PTC treatment and the storage component ITC treatment. Public project descriptions also report an estimated $250 million project investment and a nearly $500 million system cost, but those figures are investment or construction estimates rather than disclosed debt amounts, sale consideration, or portfolio transaction values. No named lenders, financing closing date, acquisition price, or sale consideration was disclosed. — FLORIDA POWER & LIGHT COMPANY GENERATION PORTFOLIO · confidence: medium
- Financing summary: NextEra's generation portfolio as of June 30, 2025 lists Proxima Solar at 190 MW and Proxima Energy Storage at 162 MW, each 100%-owned and classified as financed with DMI/Project Debt; the solar component receives PTC treatment and the storage component ITC treatment. Public project descriptions also report an estimated $250 million project investment and a nearly $500 million system cost, but those figures are investment or construction estimates rather than disclosed debt amounts, sale consideration, or portfolio transaction values. No named lenders, financing closing date, acquisition price, or sale consideration was disclosed. — FPL · confidence: medium
- Financing summary: NextEra's generation portfolio as of June 30, 2025 lists Proxima Solar at 190 MW and Proxima Energy Storage at 162 MW, each 100%-owned and classified as financed with DMI/Project Debt; the solar component receives PTC treatment and the storage component ITC treatment. Public project descriptions also report an estimated $250 million project investment and a nearly $500 million system cost, but those figures are investment or construction estimates rather than disclosed debt amounts, sale consideration, or portfolio transaction values. No named lenders, financing closing date, acquisition price, or sale consideration was disclosed. — NextEra Energy Resources | Proxima Solar · confidence: medium
- Financing summary: NextEra's generation portfolio as of June 30, 2025 lists Proxima Solar at 190 MW and Proxima Energy Storage at 162 MW, each 100%-owned and classified as financed with DMI/Project Debt; the solar component receives PTC treatment and the storage component ITC treatment. Public project descriptions also report an estimated $250 million project investment and a nearly $500 million system cost, but those figures are investment or construction estimates rather than disclosed debt amounts, sale consideration, or portfolio transaction values. No named lenders, financing closing date, acquisition price, or sale consideration was disclosed. — Stanislaus solar project provides backdrop for Newsom | Modesto Bee · confidence: medium
- Commercial parties.2: {"relationship":"General / prime contractor","name":"Cupertino Electric, Inc. (CEI)","detail":"CEI identifies itself as the general or prime contractor and describes installation of the solar panels, substation, SCADA system, and battery energy storage system.","official_url":"https://www.cei.com/"} — Proxima Solar | Cupertino Electric · confidence: medium
- Commercial parties.0: {"relationship":"Owner / developer","name":"NextEra Energy Resources","detail":"NextEra Energy Resources owns and developed the project; its official project page identifies Proxima as a subsidiary project, and its generation portfolio lists the solar and storage components at 100% ownership.","official_url":"https://www.nexteraenergyresources.com/"} — NextEra Energy Resources | Proxima Solar · confidence: high
- Commercial parties.0: {"relationship":"Owner / developer","name":"NextEra Energy Resources","detail":"NextEra Energy Resources owns and developed the project; its official project page identifies Proxima as a subsidiary project, and its generation portfolio lists the solar and storage components at 100% ownership.","official_url":"https://www.nexteraenergyresources.com/"} — FLORIDA POWER & LIGHT COMPANY GENERATION PORTFOLIO · confidence: high
- Commercial parties.0: {"relationship":"Owner / developer","name":"NextEra Energy Resources","detail":"NextEra Energy Resources owns and developed the project; its official project page identifies Proxima as a subsidiary project, and its generation portfolio lists the solar and storage components at 100% ownership.","official_url":"https://www.nexteraenergyresources.com/"} — Stanislaus solar project provides backdrop for Newsom | Modesto Bee · confidence: high
- Commercial parties.6: {"relationship":"Landowner / lessor and permitting authority","name":"Stanislaus County","detail":"The County owned the approximately 1,600-acre site, entered the land-option and lease arrangements, and approved the permit amendment that identified the former Fink Road Solar Farm as the Proxima Solar Energy Center.","official_url":null} — Staff Approval Permit Application No. PLN2020-0061 - Proxima Solar Energy Center · confidence: high
- Timeline.0: {"event":"Original Fink Road Solar Farm development","date":"2009-12-08","detail":"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."} — Source · confidence: medium
- Timeline.3: {"event":"Permit amendment and project renaming","date":"2021-03-29","detail":"Stanislaus County approved an amendment to Use Permit No. 2010-03 for the Fink Road Solar Farm, identified in the CEQA record as the Proxima Solar Energy Center."} — Staff Approval Permit Application No. PLN2020-0061 - Proxima Solar Energy Center · confidence: high
- Timeline.4: {"event":"NextEra lease-option exercise","date":"2022-01","detail":"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."} — Source · confidence: high
- Timeline.6: {"event":"Solar-and-storage project under construction","date":"2023-05","detail":"The Proxima Solar Farm was reported under construction, with NextEra Energy Resources building the project and CEI serving as general or prime contractor for the solar, substation, SCADA, and battery scope."} — Stanislaus solar project provides backdrop for Newsom | Modesto Bee · confidence: medium
- Timeline.8: {"event":"Portfolio in-service designation","date":"2024","detail":"NextEra's generation portfolio lists Proxima Solar and Proxima Energy Storage as 2024 in-service assets."} — FLORIDA POWER & LIGHT COMPANY GENERATION PORTFOLIO · confidence: high
- Quality notes.0: Capacity figures use different reporting bases: the operational plant record lists 352 MW, NextEra's 2025 portfolio separates the asset into 190 MW of PV solar and 162 MW of storage, while CEI's construction page describes a 252 MW DC solar scope and a 148 MW BESS. These figures should not be added together or treated as interchangeable. — Proxima Solar | Cupertino Electric · confidence: medium

## Timeline

- 2009-12-08 — Original Fink Road Solar Farm development
  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.
  Source: Source (https://www.stancounty.com/planning/agenda/2012/03-01-12/fink%20rd%20sr.pdf)
- 2017-09 — Lease/project-rights assignment to Proxima
  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.
  Source: Source (https://www.stancounty.com/bos/agenda/2022/20220830/B07.pdf)
- 2021-03-29 — Permit amendment and project renaming
  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.
  Source: Staff Approval Permit Application No. PLN2020-0061 - Proxima Solar Energy Center (https://ceqanet.lci.ca.gov/2021060330)
- 2022-01 — NextEra lease-option exercise
  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.
  Source: Source (https://www.stancounty.com/bos/agenda/2022/20220830/B07.pdf)
- 2022-03-16 — Interconnection construction notice
  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.
  Source: Pacific Gas & Electric Company ELC (Corp ID 39) Status of Advice Letter 6529E Disposition: Accepted Effective Date: 04-14-2022 (https://www.pge.com/tariffs/assets/pdf/adviceletter/ELEC_6529-E.pdf)

## Sources

- [Appendix C Physical, Environmental, Resilience Conditions](https://www.stancounty.com/ceo/econ-dev/pdf/edac/2025/DRAFT.Appendix-C-Physical-Conditions.pdf) — stancounty.com · tier other
- [NextEra Energy Resources](https://www.nexteraenergyresources.com/) — nexteraenergyresources.com · tier other
- [MBR | Index](https://mbrweb.ferc.gov/SearchlkpEIA/Index?page=756) — mbrweb.ferc.gov · tier regulatory
- [Public Queue Report](https://www.caiso.com/documents/publicqueuereport.xlsx) — caiso.com · tier other
- [Notice of Determination](https://www.stancounty.com/clerkrecorder/pdf/ceqa/20210401_nod.pdf) — stancounty.com · tier other
- [Pacific Gas & Electric Company ELC (Corp ID 39) Status of Advice Letter 6529E Disposition: Accepted Effective Date: 04-14-2022](https://www.pge.com/tariffs/assets/pdf/adviceletter/ELEC_6529-E.pdf) — pge.com · tier other
- [Proxima Solar | Cupertino Electric](https://www.cei.com/our-work/proxima-solar) — cei.com · tier other
- [Staff Approval Permit Application No. PLN2020-0061 - Proxima Solar Energy Center](https://ceqanet.lci.ca.gov/2021060330) — ceqanet.lci.ca.gov · tier regulatory
- [FLORIDA POWER & LIGHT COMPANY GENERATION PORTFOLIO](https://www.investor.nexteraenergy.com/~/media/Files/N/NEE-IR/investor-materials/supplemental-resources/generation-portfolios/2025/Copy%20of%20FPL_NextEra%20Energy%20Resources%20Generation%20Portfolios_6302025%20vf%202.pdf) — investor.nexteraenergy.com · tier other
- [Source](https://www.stancounty.com/bos/agenda/2022/20220830/B07.pdf) — stancounty.com · tier other
- [NextEra Energy Resources | Proxima Solar](https://www.nexteraenergyresources.com/proxima-solar.html) — nexteraenergyresources.com · tier other
- [FPL](https://www.investor.nexteraenergy.com/~/media/Files/N/NEE-IR/investor-materials/supplemental-resources/generation-portfolios/2024/Q3/Copy%20of%20FPL_NextEra%20Energy%20Resources%20Generation%20Portfolios_9302024.xlsx) — investor.nexteraenergy.com · tier other
- [Stanislaus solar project provides backdrop for Newsom | Modesto Bee](https://www.modbee.com/news/local/article275608151.html) — modbee.com · tier other
- [Source](https://www.stancounty.com/planning/agenda/2012/03-01-12/fink%20rd%20sr.pdf) — stancounty.com · tier other
- [FPL_NextEra Energy Resources Generation Portfolios_9.30.2025.xlsx](https://www.investor.nexteraenergy.com/~/media/Files/N/NEE-IR/investor-materials/supplemental-resources/generation-portfolios/2025/Copy%20of%20FPL_NextEra%20Energy%20Resources%20Generation%20Portfolios_9302025.pdf) — investor.nexteraenergy.com · tier other
- [Federal Register :: Proxima Solar, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization](https://www.federalregister.gov/documents/2023/10/16/2023-22767/proxima-solar-llc-supplemental-notice-that-initial-market-based-rate-filing-includes-request-for) — federalregister.gov · tier regulatory
- [Proxima Solar PV Park](https://www.globaldata.com/store/report/proxima-solar-pv-park-profile-snapshot/) — globaldata.com · tier other
- [Source](https://www.caiso.com/documents/metering-exemption-listing-report-2026.pdf) — caiso.com · tier other

## Data quality

- Capacity figures use different reporting bases: the operational plant record lists 352 MW, NextEra's 2025 portfolio separates the asset into 190 MW of PV solar and 162 MW of storage, while CEI's construction page describes a 252 MW DC solar scope and a 148 MW BESS. These figures should not be added together or treated as interchangeable. No separate project acquisition or sale transaction, seller, buyer, or transaction month/year was identified.

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Canonical page: https://askthegrid.com/assets/facilities/proxima

Source: Ask the Grid — https://askthegrid.com/