Where is Mark One Power Station?

In Brazoria 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 Mark One Power Station?

484 MW of nameplate capacity across 8 units, as of the EIA-860M release for 2026-07.

Who owns Mark One Power Station?

EIA-860M names City of San Antonio - (TX) 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 Mark One Power Station LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — City of San Antonio - (TX) 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 "Mark One Power Station LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Mark One Power Station still running?

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

Mark One Power Station

Mark One Power Station is a 484 MW natural gas power plant in Brazoria County, Texas, operated by City of San Antonio - (TX). EIA-860M lists 8 generating units here, inside ERCOT. Its units entered service between 2022 and 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: 484 MW; 356.8 MW net summer
Generating units: 8
In service: 2022–2024
EIA plant ID: 65372

Where it is

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County: Brazoria County, Texas
Coordinates: 29.2271, -95.4308
Balancing authority: ERCO
Sector: Electric Utility

Units, technology and status

Operator of record: City of San Antonio - (TX)
Primary energy source: Natural gas
Technologies: Natural Gas Fired Combustion Turbine
Status: Operating

Every plant City of San Antonio - (TX) reports to EIA →

Mark One Power Station: FAQ

Where is Mark One Power Station?: In Brazoria 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 Mark One Power Station?: 484 MW of nameplate capacity across 8 units, as of the EIA-860M release for 2026-07.
Who owns Mark One Power Station?: EIA-860M names City of San Antonio - (TX) 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 Mark One Power Station LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — City of San Antonio - (TX) 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 "Mark One Power Station LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Mark One Power Station still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.