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.

How much electricity does Baldy Mesa Solar & Storage generate?

Baldy Mesa Solar & Storage reported 307.9 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.

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.

How does Baldy Mesa Solar & Storage compare to other plants?

By capacity, Baldy Mesa Solar & Storage ranks #266 of 7,234 operating plants of the same technology nationally. It ranks #49 of 939 in CA.

Baldy Mesa Solar & Storage — 225 MW solar farm, CA

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Baldy Mesa Solar & Storage — 225 MW solar farm, CA · Ask the Grid

Overview

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
Battery subsystem rating.
Operating status: Operating
Baldy Mesa Solar & Storage is operating.
Grid connection: Roadway Substation
115 kV · Southern California Edison (SCE)

Profile

Grid role: Solar-plus-storage facility that stores daytime solar generation for nighttime or peak-demand use and supports grid reliability.
Grid connection: Roadway Substation · 115 kV · Southern California Edison (SCE).
Context: Contemporary project coverage identified Baldy Mesa as California’s largest DC-coupled solar-plus-storage plant at the time of its October 2024 inauguration.
Physical build: Operational 150 MW solar facility paired with 75 MW / 300 MWh battery storage in Adelanto, San Bernardino County, California. AES developed, owns, and operates the project; Fluence supplied the storage system and bidding software. Power is delivered through a five-mile transmission line to Southern California Edison’s Roadway Substation. The available sources refer to one battery unit but do not provide installed module, panel, inverter, or PCS counts.

Structured profile

Reported capacity: 225 MW
Solar Photovoltaic, Batteries
Energy: 300 MWh
4-hour storage duration
Operating status: operating
Baldy Mesa Solar & Storage is operating.
Interconnection: Roadway Substation
115 kV · Southern California Edison (SCE)
Location: San Bernardino County
CAISO

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Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
BDMSS	75 MW 75 MW summer	Batteries Electricity used for energy storage · BA	May 2024	Operating
BLDMS	150 MW 150 MW summer	Solar Photovoltaic Solar · PV	May 2024	Operating

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 150 MW; Solar Photovoltaic
National rank: #266; of 7,234 operating peers
CA rank: #49; of 939 operating peers

Monthly generation

Download CSV

Latest 12 months

307.9 GWh

Reported net generation

Latest report

Jun 2026

EIA-923 monthly filing

2025 capacity factor

15.1%

Using current reported nameplate capacity

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Nearby substations

HIFLD infrastructure inventory

ROADWAY

IN SERVICE · 115 kV

5.3 km

ADELANTO

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

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

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AssetOwner / operatorProject companyRelated asset

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

Reporting portfolio

EIA reporting entity

AES Clean Energy

Entity 64904

Operating portfolio

48 plants

15 states

Reported capacity

4,273.7 MW

Batteries · Onshore Wind Turbine · Solar Photovoltaic

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Rexford Solar Farm	540 MW	CA
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
Raceway Solar & Storage	205 MW	CA

Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.

View full reporting portfolio

Baldy Mesa Solar & Storage