How big is Atlas VII?

Atlas VII has a reported capacity of 300 MW. Source: EIA Form 860.

What kind of plant is Atlas VII?

Atlas VII is a batteries facility in La Paz County, AZ, participating in the CAISO market.

Where is Atlas VII located?

Atlas VII is in La Paz County, AZ, inside the CAISO balancing area.

Who operates Atlas VII?

Atlas VII is operated by Atlas VII LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Atlas VII generate?

Atlas VII reported 141.2 GWh over the twelve months to 2026-06. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.

Where does Atlas VII connect to the grid?

Atlas VII interconnects at Cielo Azul, on the California Independent System Operator (CAISO) system.

How does Atlas VII compare to other plants?

By capacity, Atlas VII ranks #11 of 962 operating plants of the same technology nationally. It ranks #1 of 47 in AZ.

Atlas VII — 300 MW battery storage, La Paz County, AZ

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Atlas VII — 300 MW battery storage, La Paz County, AZ · Ask the Grid

Overview

Power / energy: 300 MW / 1,200 MWh
Reported plant capacity and configuration.
Technology: Batteries
Primary generation technology.
Registry anchor: Plant 68322
Atlas VII LLC · La Paz County · CAISO
Storage duration: 4 hours
Battery subsystem rating.
Operating status: Operating
Atlas VII is operating.
Grid connection: Cielo Azul
California Independent System Operator (CAISO)
Equipment: 2 battery units
Installed equipment documented in public project records.

Profile

Grid role: Standalone battery storage providing capacity and energy under 15-year Southern California Edison resource-adequacy contracts to support CAISO-grid stability, reliability, and resilience.
Grid connection: Cielo Azul · California Independent System Operator (CAISO).
Physical build: Operational standalone BESS in La Paz County, Arizona, rated at 300 MW / 1,200 MWh. The plant has two battery-generating units: ALT7A at 180 MW and ALT7B at 120 MW. Qcells served as EPC contractor.

Structured profile

Reported capacity: 300 MW
Batteries
Energy: 1,200 MWh
4-hour storage duration
Operating status: operating
Atlas VII is operating.
Interconnection: Cielo Azul
California Independent System Operator (CAISO)
Location: La Paz County
CAISO

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Units and generators

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

Generator	Capacity	Technology	Operation	Status
ALT7A	180 MW 180 MW summer	Batteries Electricity used for energy storage · BA	Oct 2025	Operating
ALT7B	120 MW 120 MW summer	Batteries Electricity used for energy storage · BA	Oct 2025	Operating

Performance

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

Peer context

Technology capacity: 300 MW; Batteries
National rank: #11; of 962 operating peers
AZ rank: #1; of 47 operating peers

Monthly generation

Download CSV

Latest 12 months

141.2 GWh

Reported gross generation

Latest report

Jun 2026

EIA-923 monthly filing

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

UNKNOWN306568

NOT AVAILABLE · 115 kV

5.8 km

UNKNOWN305616

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

Offtake Contract Approval

Mar 21, 2024

CPUC Resolution E-5309 (March 21, 2024) approved Southern California Edison's Mid-Term Reliability contract with TransGrid Atlas VII, LLC, covering 300 MW nameplate capacity and 225 MW incremental September NQC. Deliveries scheduled June 1, 2025 through May 31, 2040. This is an RA-only offtake agreement, not an energy PPA.

300 MW contracted15 yearsSouthern California Edison Company · TransGrid Atlas VII, LLC

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

Drag organizations to explore the network. Select a node to pin its details and available page link.

AssetOwner / operatorContractorOfftaker

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Mar 21, 2024
Mar 21, 2024
SCE resource-adequacy contract recordedSource
A CPUC draft resolution identified TransGrid Atlas VII as a 300 MW project with 225 MW of incremental September net qualifying capacity, a 15-year term, and a scheduled initial delivery date of June 1, 2025.
Dec 2024
Dec 2024
Project Financing Closed

Atlas VII