McFarland B Solar and Storage is a hybrid solar and battery storage facility with 450 MW of EIA-reported operating capacity in Yuma County, Arizona, registered as EIA Plant ID 66637. AES Clean Energy owns and operates the plant. An EIA-based plant record ranks McFarland B Solar and Storage as the #52 power plant in the United States and #4 in Arizona by capacity, at 450 MW.
EIA-reported operating capacity; nameplate, seasonal, AC/DC, and unit ratings may differ.
Primary generation technology.
AES Clean Energy · Yuma County · CAISO
McFarland B Solar and Storage is operating.
500 kV · Arizona Public Service Company (APS), with the Hoodoo Wash switchyard co-owned by APS, San Diego Gas & Electric (SDG&E), and Imperial Irrigation District (IID)
Batteries, Solar Photovoltaic
McFarland B Solar and Storage is operating.
500 kV · Arizona Public Service Company (APS), with the Hoodoo Wash switchyard co-owned by APS, San Diego Gas & Electric (SDG&E), and Imperial Irrigation District (IID)
CAISO
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| BESS | 150 MW 150 MW summer | Batteries Electricity used for energy storage · BA | Dec 2024 | Operating |
| MCFRB | 300 MW 300 MW summer | Solar Photovoltaic Solar · PV | Dec 2024 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Sustainable Power Group, doing business as McFarland Solar LLC, submitted the McFarland B Solar Project application for a proposed facility of up to 85 MW in Yuma County; the application estimated construction in 2017–2018.
CAISO · Yuma County
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Rexford Solar Farm | 540 MW | CA | |
| McFarland B Solar and StorageCurrent | 450 MW | AZ | |
| McFarland A Solar and Storage | 300 MW | AZ | |
| Morris Solar | 250 MW | MO | |
| Chevelon Butte Wind Farm | 238.2 MW | AZ | |
| Baldy Mesa Solar & Storage | 225 MW | CA | |
| Chevelon Butte Phase 2 | 216 MW | AZ | |
| Raceway Solar & Storage | 205 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioThe CAISO tariff record adopting the non-conforming Large Generator Interconnection Agreement for McFarland Solar A and B became effective, covering the CAISO, APS, SDG&E, IID, and the project companies.
WW Clyde reported completion of site-preparation work for AES's 300 MW solar and BESS Phase B facility, including earthwork, access roads, and inverter/BESS foundations.
EIA-860 lists generator BESS, generator MCFRB with this operating date.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
McFarland B Solar and Storage has a reported capacity of 450 MW. Source: EIA Form 860.
McFarland B Solar and Storage is a Batteries, Solar Photovoltaic facility in Yuma County, AZ, participating in the CAISO market.
McFarland B Solar and Storage is in Yuma County, AZ, inside the CAISO balancing area.
McFarland B Solar and Storage is operated by AES Clean Energy according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
McFarland B Solar and Storage reported 774.5 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
McFarland B Solar and Storage interconnects at Hoodoo Wash 500 kV Switchyard, on the Arizona Public Service Company (APS), with the Hoodoo Wash switchyard co-owned by APS, San Diego Gas & Electric (SDG&E), and Imperial Irrigation District (IID) system.
By capacity, McFarland B Solar and Storage ranks #38 of 7,234 operating plants of the same technology nationally. It ranks #3 of 118 in AZ.
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.
