Baldy Mesa Solar & Storage
AES Clean EnergySan Bernardino County
Baldy Mesa Solar & Storage is a hybrid solar and battery storage facility with 225 MW of EIA-reported total operating capacity and 300 MWh of reported storage energy capacity in San Bernardino County, California, registered as EIA Plant ID 66598. AES Clean Energy owns and operates the plant. Contemporary project coverage identified Baldy Mesa as California’s largest DC-coupled solar-plus-storage plant at the time of its October 2024 inauguration.
Mapped infrastructure geometry associated with this asset.
Solar Photovoltaic, Batteries
4-hour storage duration
Baldy Mesa Solar & Storage is operating.
115 kV · Southern California Edison (SCE)
EIA plant 66598 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| BDMSS | Batteries | Operating | 75 | 300 |
| BLDMS | Solar Photovoltaic | Operating | 150 | Unknown |
Similar plants ranked by technology, capacity, and distance.
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| BDMSS | 75 MW 75 MW summer | Batteries BA | May 2024 | Operating |
| BLDMS | 150 MW 150 MW summer | Solar Photovoltaic PV | May 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.
The City of Adelanto adopted a Mitigated Negative Declaration and granted a Conditional Use Permit for the Baldy Mesa project. Contemporary reporting identified sPower as the project builder, operator, and owner during development.
CAISO
CAISO · San Bernardino 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 Storage | 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 & StorageCurrent | 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 Adelanto project fact sheet scheduled construction to start in the third quarter of 2022.
The California Public Utilities Commission approved SCE’s request to grant Baldy Mesa Solar, LLC an overhead easement supporting the project’s interconnection. The easement’s appraised value was $500, which was a property transaction rather than project financing or sale consideration.
FERC published a supplemental notice for Baldy Mesa Solar, LLC’s application for market-based-rate authority and related blanket Section 204 authorization request under Docket ER23-1319-000.
EIA-860 lists generator BDMSS, generator BLDMS with this operating date.
The project was reported connected to the grid as a 150 MW solar and 75 MW storage facility enabled by Amazon, with AES as developer and owner.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Baldy Mesa Solar & Storage reports 75 MW battery storage + 150 MW solar of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
Baldy Mesa Solar & Storage is a Solar Photovoltaic, Batteries facility in San Bernardino County, CA, participating in the CAISO market.
Baldy Mesa Solar & Storage is in San Bernardino County, CA, inside the CAISO balancing area.
Baldy Mesa Solar & Storage is operated by AES Clean Energy according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Baldy Mesa Solar & Storage reported 298.8 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.
Baldy Mesa Solar & Storage interconnects at Roadway Substation, on the Southern California Edison (SCE) system.
By capacity, Baldy Mesa Solar & Storage ranks #284 of 7,597 operating plants of the same technology nationally. It ranks #49 of 972 in CA.
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.