How big is Blythe Mesa Solar II?

Blythe Mesa Solar II is a hybrid solar and battery storage facility with 335.6 MW of EIA-reported total operating capacity and 448 MWh of reported storage energy capacity in Riverside County, California, registered as EIA Plant ID 65053. Intersect Power, LLC is the current owner. The EIA-based plant record ranks Blythe Mesa Solar II #101 in the United States and #20 in California by capacity.

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Overview

Key fields

Generation / storage: 335.6 MW total / 448 MWh storage
Reported plant capacity and configuration.
Technology: Solar + battery storage
Primary generation technology.
Registry anchor: Plant 65053
Riverside County · CAISO
Storage duration: 4 hours
Battery subsystem rating.
Operating status: Operating
Blythe Mesa Solar II is operating.
Grid connection: Southern California Edison Colorado River Substation
230 kV · Southern California Edison

Profile

Grid role: Co-located solar generation with battery storage used for energy arbitrage and renewable firming.
Grid connection: Southern California Edison Colorado River Substation · 230 kV · Southern California Edison.
Context: The EIA-based plant record ranks Blythe Mesa Solar II #101 in the United States and #20 in California by capacity. Its 230-kV gen-tie connects the facility to Southern California Edison’s Colorado River Substation.
Physical build: Operational Blythe Mesa Solar II (also known as Athos III) includes a 224 MWac / 310 MWp solar PV facility, 448 MWh of co-located storage, and a 230-kV gen-tie to the Southern California Edison Colorado River Substation. Signal Energy's full design-build scope covered civil, structural, collection, grounding, communications, auxiliary power, cable and auxiliary-transformer/panel procurement, and complete civil, foundation, and electrical construction. The EIA-based plant record reports two generating units totaling 335.6 MW. Explicitly identified equipment families are Tesla Megapack 2.0, First Solar Series 6 PV modules, and Nextracker NX Horizon trackers with TrueCapture software; installed module, battery-unit, container, PCS, and inverter counts are not stated.

Structured profile

Reported capacity: 335.6 MW
Batteries, Solar Photovoltaic
Energy: 448 MWh
4-hour storage duration
Operating status: operating
Blythe Mesa Solar II is operating.
Interconnection: Southern California Edison Colorado River Substation
230 kV · Southern California Edison
Location

Units and generators

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

Generator	Capacity	Technology	Operation	Status
BMSES	112 MW 112 MW summer	Batteries Electricity used for energy storage · BA	Dec 2022	Operating
IPBMS	223.6 MW 223.6 MW summer	Solar Photovoltaic Solar · PV	Dec 2022	Operating

Performance

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

Peer context

Technology capacity: 223.6 MW
National rank: #127
CA rank: #24

Monthly generation

Download CSV

Latest 12 months

588.6 GWh

Reported net generation

Latest report

Apr 2026

EIA-923 monthly filing

2025 capacity factor

19.9%

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

BUCK

IN SERVICE · 230 kV

2.8 km

BLYTHE WALC

Commercial, land, and environmental record

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

Transactions and agreements

Acquisition

2020

Intersect Power took ownership of the exact Athos III asset, also known as Blythe Mesa Solar II, from RRG Renewables in 2020. No acquisition consideration was disclosed.

Intersect Power LLC · RRG Renewables

BLM announces Blythe Mesa Solar Project is fully operational | Bureau of Land Management

Land and environmental record

Environmental Permit

Sep 14, 2021

The project-specific dredge-and-fill permit is Colorado River Basin Regional Water Quality Control Board Order R7-2021-0047, with WDID 7B333031001, Regulatory Measure ID 442791, and Place ID 873330

The order applies to the Blythe Mesa Solar II Project and regulates dredged or fill discharges to waters of the state. The project receiving water is Pallowalla Wash.

Source

Facility And Transmission Land Components

May 3, 2021

The project includes a 1,731-acre solar-and-battery site and an approximately 5.5-mile, 80-acre gen-tie corridor in a 125-foot-wide right-of-way

The project-specific public notice identifies the solar facility and battery storage site as 1,731 acres. The 230 kV gen-tie is approximately 5.5 miles long, occupying 80 acres within a 125-foot-wide ROW on BLM-managed land.

Source

Regulatory Project Footprint

Sep 14, 2021

The Colorado River Basin Water Board defines the permitted Blythe Mesa Solar II Project footprint as 1,811 acres

This is the acreage stated in the project-specific Waste Discharge Requirements for construction, operation, maintenance, and decommissioning. Regulatory footprint includes facility and gen-tie but differs from BLM's roughly 3,600-acre private-land figure.

Source

Site Acreage

Jan 11, 2023

The operating project occupies roughly 3,600 acres of private land

BLM describes the fully operational 224 MW solar and 112 MW battery project as being on roughly 3,600 acres of private land. Its 230 kV gen-tie crosses BLM-managed public lands.

BLM announces Blythe Mesa Solar Project is fully operational | Bureau of Land Management

Site And Parcel-Location Record

May 3, 2021

The project is in the City of Blythe area of Riverside County at 33.627641, -114.683293; the cited legal sections are Sections 11 and 12 of T7S/R21E, Sections 5 and 6 of T7S/R22E, and Sections 28, 29, 31, 32, and 33 of T6S/R22E, San Bernardino Base Meridian

The exact-project public notice gives the coordinates, legal land description, and receiving water (Pallowalla Wash). The project is west of Neighbors Boulevard and Arrowhead Boulevard and near Blythe Airport.

Source

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 / operatorFinancier

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

2015
2015
BLM gen-tie and access-road approvalBLM announc...
The Bureau of Land Management approved the project’s 5.2-mile gen-tie transmission line and access road crossing BLM-managed public lands.
Dec 2022

Reporting portfolio

EIA reporting entity

Blythe Mesa Solar II, LLC

Entity 67582

Operating portfolio

6 plants

2 states

Reported capacity

2,378.8 MW

Batteries · Solar Photovoltaic

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Lumina Solar Project	486.6 MW	TX
Lumina II Solar Project	486.6 MW	TX
Oberon Solar Project	375 MW	CA
Oberon II Solar Project	375 MW	CA
Blythe Mesa Solar IICurrent	335.6 MW	CA
IP Radian, LLC	320 MW	TX

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

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Blythe Mesa Solar II

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Overview

Key fields

Profile

Structured profile

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Transactions and agreements

Land and environmental record

Related parties and identifiers

Relationship graph

Timeline and sources

Project timeline

Parties and identifiers

Reporting portfolio

Sources

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