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

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

Generation and physical site

EIA plant 68324 · Inventory for Sep 2026.

Reported operating nameplate by technology

Battery storage: 150 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (1)

EIA generator status and nameplate capacity for Atlas IX
Generator	Technology	Status	Power (MW)	Energy (MWh)
ALT9	Batteries	Operating	150	600

Physical map location · OpenStreetMap: 33.58061, -113.58370
Filed location · EIA: 33.58290, -113.57690

Registered plants sharing this mapped site

Shared physical site membership. Each plant keeps its own identity; this does not establish an electrical connection or settlement node.

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Sep 2026
EIA retrieved: Oct 24, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: Sep 18, 2026
Map prepared: Oct 24, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Generator	Capacity	Technology	Operation	Status
ALT9	150 MW 150 MW summer	Batteries BA	Oct 2025	Operating

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
ConstructionSource
TransGrid announced that Atlas VII and Atlas IX were under construction by Qcells and intended to reach commercial operation later in 2025.
Oct 2025
Oct 2025
Generator enters operationEIA-860
EIA-860 lists generator ALT9 with this operating date.

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

docs.cpuc.ca.gov527800877regulatory

Common questions about Atlas IX

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

How big is Atlas IX?

Atlas IX reports 150 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.

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 86 GWh over the twelve months to 2026-07. 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 #102 of 1,061 operating plants of the same technology nationally. It ranks #21 of 55 in AZ.

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.

Atlas VIIBatteriesBatteries · same type300 MW680 m ATLAS Solar V, LLCSolar PhotovoltaicSolar Photovoltaic200 MW1 km Centennial FlatsBatteries, Solar PhotovoltaicBatteries, Solar Photovoltaic511 MW5.2 km

Overview

Overview

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Profile

Structured profile

Generation and physical site

Reported operating nameplate by technology

Registered plants sharing this mapped site

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