Where is Sun Streams 4?

In Maricopa County, Arizona (AZ). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

How big is Sun Streams 4?

600 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.

Who owns Sun Streams 4?

EIA-860M names Sun Streams Expansion, LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.

Is this the same as Sun Streams 4 LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Sun Streams Expansion, LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Sun Streams 4 LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Sun Streams 4 still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Sun Streams 4

Sun Streams 4 is a 600 MW battery storage project in Maricopa County, Arizona, operated by Sun Streams Expansion, LLC. EIA-860M lists 2 generating units here. Its units entered service in 2025.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Nameplate capacity: 600 MW; 600 MW net summer
Generating units: 2
In service: 2025
EIA plant ID: 67291

Where it is

Loading map…

County: Maricopa County, Arizona
Coordinates: 33.3613, -112.7801
Balancing authority: AZPS
Sector: IPP Non-CHP

Units, technology and status

Operator of record: Sun Streams Expansion, LLC
Primary energy source: Battery
Technologies: Batteries, Solar Photovoltaic
Status: Operating

This site runs on more than one energy source. EIA-860M capacity splits: Battery 300 MW, Solar 300 MW. It is filed here under Battery, the source with the most capacity.

Every plant Sun Streams Expansion, LLC reports to EIA →

Sun Streams 4: FAQ

Where is Sun Streams 4?: In Maricopa County, Arizona (AZ). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
How big is Sun Streams 4?: 600 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
Who owns Sun Streams 4?: EIA-860M names Sun Streams Expansion, LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
Is this the same as Sun Streams 4 LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Sun Streams Expansion, LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Sun Streams 4 LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Sun Streams 4 still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.