Where is Callisto I Energy Center?

In Harris County, Texas (TX). 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 Callisto I Energy Center?

223 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.

Who owns Callisto I Energy Center?

EIA-860M names Callisto I Energy Center 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 Callisto I Energy Center LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Callisto I Energy Center 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 "Callisto I Energy Center LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Callisto I Energy Center still running?

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

Callisto I Energy Center

Callisto I Energy Center is a 223 MW battery storage project in Harris County, Texas, operated by Callisto I Energy Center. EIA-860M lists 1 generating unit here, inside ERCOT. Its unit entered service in 2024.

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: 223.4 MW; 200 MW net summer
Generating units: 1
In service: 2024
EIA plant ID: 66338

Where it is

Loading map…

County: Harris County, Texas
Coordinates: 29.6468, -95.4505
Balancing authority: ERCO
Sector: IPP Non-CHP

Units, technology and status

Operator of record: Callisto I Energy Center
Primary energy source: Battery
Technologies: Batteries
Status: Operating

Every plant Callisto I Energy Center reports to EIA →

Callisto I Energy Center: FAQ

Where is Callisto I Energy Center?: In Harris County, Texas (TX). 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 Callisto I Energy Center?: 223 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
Who owns Callisto I Energy Center?: EIA-860M names Callisto I Energy Center 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 Callisto I Energy Center LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Callisto I Energy Center 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 "Callisto I Energy Center LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Callisto I Energy Center still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.