Atlas IX has a reported capacity of 150 MW and an energy capacity of 600 MWh. Source: EIA Form 860.

What kind of plant is Atlas IX?

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

Where is Atlas IX located?

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

Who operates Atlas IX?

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

How much electricity does Atlas IX generate?

Atlas IX reported 70.9 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.

How does Atlas IX compare to other plants?

By capacity, Atlas IX ranks #85 of 962 operating plants of the same technology nationally. It ranks #16 of 47 in AZ.

Atlas IX — 150 MW battery storage, La Paz County, AZ

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Atlas IX — 150 MW battery storage, La Paz County, AZ · Ask the Grid

Overview

Power / energy: 150 MW / 600 MWh
Reported plant capacity and configuration.
Technology: Batteries
Primary generation technology.
Registry anchor: Plant 68324
Atlas IX LLC · La Paz County · CAISO
Storage duration: 4 hours
Battery subsystem rating.
Operating status: Operating
Atlas IX is operating.
Equipment: 1 battery units
Installed equipment documented in public project records.

Profile

Grid role: Standalone battery storage providing capacity and energy for California grid resilience, reliability, and stability under a 15-year Southern California Edison Resource Adequacy contract in the CAISO market.
Physical build: 150 MW / 600 MWh standalone BESS in La Paz County, Arizona, in operation; Qcells was the EPC contractor for construction. EIA records identify one operational battery generating unit, ALT9, rated at 150 MW.

Structured profile

Reported capacity: 150 MW
Batteries
Energy: 600 MWh
4-hour storage duration
Operating status: operating
Atlas IX is operating.
Location: La Paz County
CAISO
Operator: Atlas IX LLC

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Units and generators

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

Generator	Capacity	Technology	Operation	Status
ALT9	150 MW 150 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: 150 MW; Batteries
National rank: #85; of 962 operating peers
AZ rank: #16; of 47 operating peers

Monthly generation

Download CSV

Latest 12 months

70.9 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.

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 / operatorProject companyContractor

Parties and identifiers

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Dec 2024
Dec 2024
Portfolio Financing CloseSource
TransGrid completed more than $1.4 billion of financing for the combined Atlas VII and Atlas IX portfolio, including $705 million of debt, $270 million of tax equity, and up to $490 million of transferable investment tax credits.
Jan 30, 2025
Jan 30, 2025

Atlas IX