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Solar Photovoltaic, BatteriesCAISO · San Bernardino County

Baldy Mesa Solar & Storage

AES Clean Energy · San Bernardino County · CAISO

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.

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Overview

Key fields

Generation / storage: 225 MW total / 300 MWh storage
Reported plant capacity and configuration.
Technology: Solar + battery storage
Primary generation technology.
Registry anchor: Plant 66598
AES Clean Energy · San Bernardino County · CAISO
Storage duration: 4 hours

Asset analyst

plant:plant-66598

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Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Land and environmental record

Environmental-Compliance Milestone

Oct 24, 2024

Minor Amendment No. 2 to ITP No. 2081-2020-037-06

CDFW approved minor amendment on October 24, 2024, allowing permittee additional six months to complete compensatory mitigation. Amendment did not increase project impacts or mitigation requirements.

Baldy Mesa Solar Project (California Endangered Species Act Incidental Take Permit No. 2081-2020- 037-06 Minor Amendment No. 2 (ITP))

Historical Construction Dust Permit

Jul 26, 2023

MDAQMD Dust Control Plan DCP000088 (inactive)

Inactive construction/demolition dust-control plan covered 900-acre solar photovoltaic construction disturbance at APN 0485-113-03, expected August 2022 through August 2023. MDAQMD inspected October 5, 2022.

Mojave Desert Air Quality Management District Permit Search Site

Local Land-Use And CEQA Approval

Dec 11, 2024

Conditional Use Permit CUP 19-09 and CEQA Mitigated Negative Declaration SCH 2020090176; updated December 11, 2024

Adelanto City Council adopted MND and approved CUP 19-09 for construction and operation (November 2020). December 11, 2024 CEQA notice addressed minor CUPs to delineate existing 75 MW BESS and proposed 50 MW BESS for total BESS scope of 125 MW.

Baldy Mesa Solar

Parcel Identifier (Main Solar Facility)

Aug 7, 2025

APN 0485-113-03

MDAQMD Dust Control Plan DCP000133 identifies APN 0485-113-03 for the 1,100-acre solar photovoltaic facility project (issued August 7, 2025; expires August 31, 2026).

Source

Parcel Identifier (Substation)

Nov 7, 2023

APN 0459-371-45

MDAQMD Dust Control Plan DCP000091 identifies APN 0459-371-45 for the approximately 13-acre substation solar project (inactive plan).

Mojave Desert Air Quality Management District Permit Search Site

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Nov 2020
Nov 2020
Project Permitting ApprovalSource
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.
2022
2022
Construction StartSource
The Adelanto project fact sheet scheduled construction to start in the third quarter of 2022.
Apr 7, 2022
Apr 7, 2022
SCE interconnection easement approvalSource
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.
Mar 21, 2023
Mar 21, 2023
FERC Market-Based-Rate FilingFederal Reg...
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.
May 21, 2024
May 21, 2024
Grid Connection ReportedBaldy Mesa ...
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.

Sources

PublisherReferenceType

files.ceqanet.lci.ca.govDraft Initial Study/Mitigated Negative Declarationregulatory

aes.comAES | Accelerating the Future of Global Energyother

info.fluenceenergy.comAccelerating the AI Economy with Battery Storageother

Common questions about Baldy Mesa Solar & Storage

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is Baldy Mesa Solar & Storage?

Baldy Mesa Solar & Storage has a reported capacity of 225 MW and an energy capacity of 300 MWh. Source: EIA Form 860.

What kind of plant is Baldy Mesa Solar & Storage?

Baldy Mesa Solar & Storage is a Solar Photovoltaic, Batteries facility in San Bernardino County, CA, participating in the CAISO market.

Where is Baldy Mesa Solar & Storage located?

Baldy Mesa Solar & Storage is in San Bernardino County, CA, inside the CAISO balancing area.

Who operates Baldy Mesa Solar & Storage?

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.

Where does Baldy Mesa Solar & Storage connect to the grid?

Baldy Mesa Solar & Storage interconnects at Roadway Substation, on the Southern California Edison (SCE) system.

Co-located assets

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.

Baldy Mesa 2_Silver Peak HybridBatteries, Solar PhotovoltaicBatteries, Solar Photovoltaic · same type75 MW55 m Industry Solar Power Generation StationSolar PhotovoltaicSolar Photovoltaic · same type2 MW6.2 km Coronus Adelanto West 1Solar PhotovoltaicSolar Photovoltaic · same type2 MW6.9 km Coronus Adelanto West 2Solar Photovoltaic

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Baldy Mesa Solar & Storage

Overview

Key fields

Ask about Baldy Mesa Solar & Storage

Baldy Mesa Solar & Storage

Overview

Key fields

Ask about Baldy Mesa Solar & Storage

Profile

Structured profile

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

Relationship graph

Parties and identifiers

Timeline and sources

Project timeline

Sources

Common questions about Baldy Mesa Solar & Storage

How big is Baldy Mesa Solar & Storage?

What kind of plant is Baldy Mesa Solar & Storage?

Where is Baldy Mesa Solar & Storage located?

Who operates Baldy Mesa Solar & Storage?

Where does Baldy Mesa Solar & Storage connect to the grid?

Co-located assets

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