# Rexford Solar Farm CAISO Solar Photovoltaic, Batteries · https://askthegrid.com/assets/facilities/rexford-solar-farm Rexford Solar Farm is a hybrid solar and battery storage facility with 540 MW of EIA-reported total operating capacity and 960 MWh of reported storage energy capacity in Tulare County, California, registered as EIA Plant ID 64633. AES Clean Energy is the registered plant entity or operator. Commercial operation began on January 31, 2025. ## Key facts - Technology: Solar Photovoltaic, Batteries - Power capacity: 540 MW - Energy capacity: 960 MWh - Operating status: operating ## Grid and market context - ISO/RTO: CAISO - Balancing authority: CISO (CAISO) - Substation: Vestal Substation - Point of interconnection: Vestal Substation - Transmission owner: Southern California Edison (SCE) - Interconnection voltage: 230 kV ## Source-backed facts - Owner logo domain: aes.com — Rexford Solar + Storage | AES · confidence: high - Identifiers: [{"value":"64633","system":"EIA plant ID"},{"value":"20SD 8me LLC","system":"FERC MBR utility/entity"},{"value":"20SD8","system":"EIA generator ID"},{"value":"1516","system":"CAISO queue number"},{"value":"43206","system":"CAISO queue record"},{"value":"REXFRD_2_RSFSX2","system":"CAISO solar resource ID"},{"value":"REXFRD_2_RSFBX2","system":"CAISO battery resource ID"}] — Public Queue Report · confidence: medium - Identifiers: [{"value":"64633","system":"EIA plant ID"},{"value":"20SD 8me LLC","system":"FERC MBR utility/entity"},{"value":"20SD8","system":"EIA generator ID"},{"value":"1516","system":"CAISO queue number"},{"value":"43206","system":"CAISO queue record"},{"value":"REXFRD_2_RSFSX2","system":"CAISO solar resource ID"},{"value":"REXFRD_2_RSFBX2","system":"CAISO battery resource ID"}] — Source · confidence: medium - Owner name: AES — Rexford Solar + Storage | AES · confidence: medium - Description: Rexford Solar Farm is an operating solar-plus-storage facility in Tulare County near Ducor, California. The EIA plant comprises two generating units totaling 540 MW: 300 MW of solar photovoltaic capacity and a 240 MW battery energy storage system. AES is the long-term owner and operator, and the facility has been operational since February 2025. Its output is delivered to Clean Power Alliance under a 15-year power purchase agreement. — Rexford Solar + Storage | AES · confidence: medium - Description: Rexford Solar Farm is an operating solar-plus-storage facility in Tulare County near Ducor, California. The EIA plant comprises two generating units totaling 540 MW: 300 MW of solar photovoltaic capacity and a 240 MW battery energy storage system. AES is the long-term owner and operator, and the facility has been operational since February 2025. Its output is delivered to Clean Power Alliance under a 15-year power purchase agreement. — Source · confidence: medium - Parties: [{"relationship":"Owner","name":"AES","official_url":"https://www.aes.com/"},{"relationship":"Operator","name":"AES Clean Energy","official_url":"https://www.aes.com/"},{"relationship":"Developer","name":"AES Clean Energy","official_url":"https://www.aes.com/"},{"relationship":"FERC-registered utility/entity","name":"20SD 8me LLC","official_url":null},{"relationship":"Power purchaser/offtaker","name":"Clean Power Alliance","official_url":"https://cleanpoweralliance.org/"}] — Rexford Solar + Storage | AES · confidence: medium - Parties: [{"relationship":"Owner","name":"AES","official_url":"https://www.aes.com/"},{"relationship":"Operator","name":"AES Clean Energy","official_url":"https://www.aes.com/"},{"relationship":"Developer","name":"AES Clean Energy","official_url":"https://www.aes.com/"},{"relationship":"FERC-registered utility/entity","name":"20SD 8me LLC","official_url":null},{"relationship":"Power purchaser/offtaker","name":"Clean Power Alliance","official_url":"https://cleanpoweralliance.org/"}] — Source · confidence: medium - Identifiers.3: {"value":"1516","system":"CAISO queue number"} — Public Queue Report · confidence: medium - Identifiers.4: {"value":"43206","system":"CAISO queue record"} — Public Queue Report · confidence: medium - Identifiers.5: {"value":"REXFRD_2_RSFSX2","system":"CAISO solar resource ID"} — Source · confidence: high - Identifiers.6: {"value":"REXFRD_2_RSFBX2","system":"CAISO battery resource ID"} — Source · confidence: medium - Parties.0: {"relationship":"Owner","name":"AES","official_url":"https://www.aes.com/"} — Rexford Solar + Storage | AES · confidence: high - Parties.4: {"relationship":"Power purchaser/offtaker","name":"Clean Power Alliance","official_url":"https://cleanpoweralliance.org/"} — Source · confidence: high - Site acres: 3800 — Source · confidence: medium - Commercial operation date: 2025-01-31 — Source · confidence: medium - Duration hours: 4 — AES' Clean Energy & Net Zero Future in California · confidence: high - Energy mwh: 960 — AES' Clean Energy & Net Zero Future in California · confidence: high - Construction scope: Operating Rexford Solar Farm comprises 300 MW of ground-mounted solar photovoltaic generation paired with a 240 MW battery-energy-storage installation in Tulare County. The facility occupies approximately 3,800 acres and includes the PV facility, energy-storage system, on-site substation, transmission and collector lines, access roads, fencing, and associated site works. Exact installed module, inverter, battery-unit, and container counts are not disclosed in the identified exact-asset sources. — Rexford Solar Farm · confidence: medium - Significance: Rexford is one of California’s largest solar-plus-storage complexes, combining 300 MW of solar generation with a 240 MW battery system and providing power for approximately 135,000 homes. — Source · confidence: medium - Description: Rexford Solar Farm is a 300 MW solar photovoltaic facility paired with a 240 MW battery energy storage system in Tulare County near Ducor, California. AES is the long-term owner and operator, and the facility occupies approximately 3,800 acres of privately owned land. Its output is delivered to Clean Power Alliance under a 15-year power purchase agreement and supports local and regional electricity demand and grid stability. AES entered an agreement dated October 2, 2023 to purchase the project company holding Rexford; the project was originally developed and announced by 8minute Solar Energy, now Avantus, and became operational in February 2025. — Rexford Solar + Storage | AES · confidence: medium - Description: Rexford Solar Farm is a 300 MW solar photovoltaic facility paired with a 240 MW battery energy storage system in Tulare County near Ducor, California. AES is the long-term owner and operator, and the facility occupies approximately 3,800 acres of privately owned land. Its output is delivered to Clean Power Alliance under a 15-year power purchase agreement and supports local and regional electricity demand and grid stability. AES entered an agreement dated October 2, 2023 to purchase the project company holding Rexford; the project was originally developed and announced by 8minute Solar Energy, now Avantus, and became operational in February 2025. — 8minute Solar Energy and Clean Power Alliance Announce Largest Solar-Plus-Storage Project Ever for a Community Choice Aggregator | Avantus · confidence: medium - Quality notes: ["The 2020 Rexford 1 announcement described an initial configuration of 300 MWac of solar and 180 MW/540 MWh of storage; the operating facility is documented as 300 MW of solar and 240 MW of battery capacity.","Rexford 2 is a separate planned project and is excluded from this record; its 2026 announcement describes 200 MW of solar and 200 MW/800 MWh of storage."] — Clean Power Alliance Approves 200 MW Solar and Battery... · confidence: medium - Financing summary: In the first quarter of 2025, AES Renewable Holdings sold a noncontrolling interest in the Rexford project company to a tax-equity investor, producing an $82 million increase in noncontrolling interests. This was a tax-equity financing or ownership-monetization transaction, not disclosed sale consideration for the project acquisition. The cited SEC acquisition note does not disclose the amount paid under AES’s October 2, 2023 agreement to purchase 100% of 20SD 8me LLC. — aes-20250331 · confidence: medium - Commercial parties: [{"relationship":"Long-term owner","name":"AES","detail":"AES is identified as the long-term owner of the Rexford facility.","official_url":"https://www.aes.com/"},{"relationship":"Operator and developer","name":"AES Clean Energy","detail":"AES Clean Energy operates the Rexford Solar Farm; AES is also identified as the project’s long-term owner and developer.","official_url":"https://www.aes.com/"},{"relationship":"Power purchaser/offtaker","name":"Clean Power Alliance","detail":"Clean Power Alliance receives the electricity under a 15-year power purchase agreement.","official_url":"https://cleanpoweralliance.org/"},{"relationship":"Predecessor developer; selling counterparty not separately named","name":"Avantus (formerly 8minute Solar Energy)","detail":"8minute announced and developed the Rexford 1 project and changed its name to Avantus in 2022. AES’s SEC acquisition note identifies the purchased target as 20SD 8me LLC but does not separately name the seller; Avantus/8minute is therefore the documented predecessor developer associated with the project rather than a conclusively named seller in that filing.","official_url":"https://avantus.com/"},{"relationship":"Acquired project company","name":"20SD 8me LLC","detail":"The Delaware project company whose 100% membership interests AES agreed to purchase on October 2, 2023; the SEC filing identifies it as holding the 300 MW solar and 240 MW battery project.","official_url":null}] — Rexford Solar + Storage | AES · confidence: medium - Commercial parties: [{"relationship":"Long-term owner","name":"AES","detail":"AES is identified as the long-term owner of the Rexford facility.","official_url":"https://www.aes.com/"},{"relationship":"Operator and developer","name":"AES Clean Energy","detail":"AES Clean Energy operates the Rexford Solar Farm; AES is also identified as the project’s long-term owner and developer.","official_url":"https://www.aes.com/"},{"relationship":"Power purchaser/offtaker","name":"Clean Power Alliance","detail":"Clean Power Alliance receives the electricity under a 15-year power purchase agreement.","official_url":"https://cleanpoweralliance.org/"},{"relationship":"Predecessor developer; selling counterparty not separately named","name":"Avantus (formerly 8minute Solar Energy)","detail":"8minute announced and developed the Rexford 1 project and changed its name to Avantus in 2022. AES’s SEC acquisition note identifies the purchased target as 20SD 8me LLC but does not separately name the seller; Avantus/8minute is therefore the documented predecessor developer associated with the project rather than a conclusively named seller in that filing.","official_url":"https://avantus.com/"},{"relationship":"Acquired project company","name":"20SD 8me LLC","detail":"The Delaware project company whose 100% membership interests AES agreed to purchase on October 2, 2023; the SEC filing identifies it as holding the 300 MW solar and 240 MW battery project.","official_url":null}] — Source · confidence: medium - Commercial parties: [{"relationship":"Long-term owner","name":"AES","detail":"AES is identified as the long-term owner of the Rexford facility.","official_url":"https://www.aes.com/"},{"relationship":"Operator and developer","name":"AES Clean Energy","detail":"AES Clean Energy operates the Rexford Solar Farm; AES is also identified as the project’s long-term owner and developer.","official_url":"https://www.aes.com/"},{"relationship":"Power purchaser/offtaker","name":"Clean Power Alliance","detail":"Clean Power Alliance receives the electricity under a 15-year power purchase agreement.","official_url":"https://cleanpoweralliance.org/"},{"relationship":"Predecessor developer; selling counterparty not separately named","name":"Avantus (formerly 8minute Solar Energy)","detail":"8minute announced and developed the Rexford 1 project and changed its name to Avantus in 2022. AES’s SEC acquisition note identifies the purchased target as 20SD 8me LLC but does not separately name the seller; Avantus/8minute is therefore the documented predecessor developer associated with the project rather than a conclusively named seller in that filing.","official_url":"https://avantus.com/"},{"relationship":"Acquired project company","name":"20SD 8me LLC","detail":"The Delaware project company whose 100% membership interests AES agreed to purchase on October 2, 2023; the SEC filing identifies it as holding the 300 MW solar and 240 MW battery project.","official_url":null}] — 8minute Solar Energy and Clean Power Alliance Announce Largest Solar-Plus-Storage Project Ever for a Community Choice Aggregator | Avantus · confidence: medium - Commercial parties.0: {"relationship":"Long-term owner","name":"AES","detail":"AES is identified as the long-term owner of the Rexford facility.","official_url":"https://www.aes.com/"} — Source · confidence: medium - Commercial parties.0: {"relationship":"Long-term owner","name":"AES","detail":"AES is identified as the long-term owner of the Rexford facility.","official_url":"https://www.aes.com/"} — Rexford Solar + Storage | AES · confidence: medium - Commercial parties.2: {"relationship":"Power purchaser/offtaker","name":"Clean Power Alliance","detail":"Clean Power Alliance receives the electricity under a 15-year power purchase agreement.","official_url":"https://cleanpoweralliance.org/"} — Source · confidence: high - Commercial parties.3: {"relationship":"Predecessor developer; selling counterparty not separately named","name":"Avantus (formerly 8minute Solar Energy)","detail":"8minute announced and developed the Rexford 1 project and changed its name to Avantus in 2022. AES’s SEC acquisition note identifies the purchased target as 20SD 8me LLC but does not separately name the seller; Avantus/8minute is therefore the documented predecessor developer associated with the project rather than a conclusively named seller in that filing.","official_url":"https://avantus.com/"} — 8minute Solar Energy and Clean Power Alliance Announce Largest Solar-Plus-Storage Project Ever for a Community Choice Aggregator | Avantus · confidence: medium - Quality notes.0: The 2020 Rexford 1 announcement described an initial configuration of 300 MWac of solar and 180 MW/540 MWh of storage; the operating facility is documented as 300 MW of solar and 240 MW of battery capacity. — 8minute Solar Energy and Clean Power Alliance Announce Largest Solar-Plus-Storage Project Ever for a Community Choice Aggregator | Avantus · confidence: medium - Quality notes.1: Rexford 2 is a separate planned project and is excluded from this record; its 2026 announcement describes 200 MW of solar and 200 MW/800 MWh of storage. — Clean Power Alliance Approves 200 MW Solar and Battery... · confidence: medium - Timeline.0: {"event":"Initial development and offtake agreement","date":"2020-09-10","detail":"8minute Solar Energy announced the Rexford 1 Solar & Storage Center and a 15-year power purchase agreement with Clean Power Alliance. The announced development comprised 300 MWac of solar and 180 MW/540 MWh of storage."} — 8minute Solar Energy and Clean Power Alliance Announce Largest Solar-Plus-Storage Project Ever for a Community Choice Aggregator | Avantus · confidence: medium - Timeline.1: {"event":"Planned construction start","date":"2022","detail":"The original developer announced that construction was expected to begin in early 2022; this is a planned milestone rather than a separately documented construction-start date."} — 8minute Solar Energy and Clean Power Alliance Announce Largest Solar-Plus-Storage Project Ever for a Community Choice Aggregator | Avantus · confidence: medium - Timeline.3: {"event":"Tax-equity financing","date":"2025-03","detail":"During the first quarter of 2025, AES Renewable Holdings sold a noncontrolling interest in the Rexford project company to a tax-equity investor, resulting in an $82 million increase in noncontrolling interests."} — aes-20250331 · confidence: high - Timeline.4: {"event":"Commercial operation","date":"2025-02","detail":"AES identifies the Rexford solar-plus-storage facility as operational since February 2025."} — Rexford Solar + Storage | AES · confidence: high - Seller: Avantus — Avantus Completes Sale of Nation’s Largest Permitted Solar and Integrated Storage Project to AES | Avantus · confidence: medium ## Timeline - 2022 — Planned construction start The original developer announced that construction was expected to begin in early 2022; this is a planned milestone rather than a separately documented construction-start date. Source: 8minute Solar Energy and Clean Power Alliance Announce Largest Solar-Plus-Storage Project Ever for a Community Choice Aggregator | Avantus (https://avantus.com/news/avantus-and-clean-power-alliance-announce-largest-solar-plus-storage-project-ever-for-a-community-choice-aggregator) - 2025-01-31 — Commercial operation Rexford Solar Farm entered commercial operation. Source: Source (https://aes.com/sustainability-impact/people-communities/projects/rexford-solar-storage) - 2025-02 — Commercial operation AES identifies the Rexford solar-plus-storage facility as operational since February 2025. Source: Rexford Solar + Storage | AES (https://www.aes.com/sustainability-impact/people-communities/projects/rexford-solar-storage) ## Sources - [Rexford Solar + Storage | AES](https://www.aes.com/sustainability-impact/people-communities/projects/rexford-solar-storage) — aes.com · tier other - [Public Queue Report](https://www.caiso.com/documents/publicqueuereport.xlsx) — caiso.com · tier other - [Meter Exemptions 2026](https://www.caiso.com/documents/metering-exemption-listing-report-2026.pdf) — caiso.com · tier other - [Source](https://files.cleanpoweralliance.org/uploads/2025/03/Clean-Power-Alliances-New-Solar-and-Battery-Storage-Projects-Boost-Socals-Energy-Resilience-Sustainability-Press-Release-3.17.2025.pdf) — files.cleanpoweralliance.org · tier other - [Rexford Solar Farm](https://ceqanet.lci.ca.gov/2020020326/4) — ceqanet.lci.ca.gov · tier regulatory - [Source](https://aes.com/sustainability-impact/people-communities/projects/rexford-solar-storage) — aes.com · tier other - [AES' Clean Energy & Net Zero Future in California](https://www.aes.com/sustainability-impact/people-communities/california) — aes.com · tier other - [8minute Solar Energy and Clean Power Alliance Announce Largest Solar-Plus-Storage Project Ever for a Community Choice Aggregator | Avantus](https://avantus.com/news/avantus-and-clean-power-alliance-announce-largest-solar-plus-storage-project-ever-for-a-community-choice-aggregator) — avantus.com · tier other - [Clean Power Alliance Approves 200 MW Solar and Battery ...](https://files.cleanpoweralliance.org/uploads/2026/07/Press-Release-Clean-Power-Alliance-Approves-200-MW-Solar-and-Battery-Storage-Agreement-7.13.2026.pdf) — files.cleanpoweralliance.org · tier other - [aes-20250331](https://www.sec.gov/Archives/edgar/data/874761/000087476125000035/aes-20250331.htm) — sec.gov · tier regulatory - [Avantus Completes Sale of Nation’s Largest Permitted Solar and Integrated Storage Project to AES | Avantus](https://avantus.com/news/avantus-completes-sale-of-nations-largest-permitted-solar-and-integrated-storage-project-to-aes) — avantus.com · tier other - [2025](https://www.aes.com/sites/vault/files/2026-03/AES-Corp-2025-Annual-Report-03-20-2026.pdf) — aes.com · tier other ## Data quality - The 2020 Rexford 1 announcement described an initial configuration of 300 MWac of solar and 180 MW/540 MWh of storage; the operating facility is documented as 300 MW of solar and 240 MW of battery capacity. Rexford 2 is a separate planned project and is excluded from this record; its 2026 announcement describes 200 MW of solar and 200 MW/800 MWh of storage. --- Canonical page: https://askthegrid.com/assets/facilities/rexford-solar-farm Source: Ask the Grid — https://askthegrid.com/