McFarland B Solar and Storage
AES Clean EnergyYuma County
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.
Mapped infrastructure geometry associated with this asset.
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
EIA plant 66637 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| BESS | Batteries | Operating | 150 | 600 |
| MCFRB | Solar Photovoltaic | Operating | 300 | Unknown |
The Hoodoo Wash transmission connection involves APS, SDG&E, and IID. CAISO’s McFarland A/B filing identifies their jointly owned switchyard. That transmission relationship does not establish SDG&E ownership of McFarland B or a power purchase agreement. The phases retain separate capacity records.
Similar plants ranked by technology, capacity, and distance.
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| BESS | 150 MW 150 MW summer | Batteries BA | Dec 2024 | Operating |
| MCFRB | 300 MW 300 MW summer | Solar Photovoltaic 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.
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 | |
| West Camp Wind Farm | 500 MW | AZ | |
| 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 |
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.
The Hoodoo Wash transmission connection involves APS, SDG&E, and IID. CAISO’s McFarland A/B filing identifies their jointly owned switchyard. That transmission relationship does not establish SDG&E ownership of McFarland B or a power purchase agreement. The phases retain separate capacity records.
McFarland B Solar and Storage reports 150 MW battery storage + 300 MW solar of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
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 790.4 GWh over the twelve months to 2026-07. 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 #45 of 7,597 operating plants of the same technology nationally. It ranks #5 of 126 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.