South Texas Project
South Texas Project is a 3 GW nuclear power plant in Matagorda County, Texas, operated by STP Nuclear Operating Co. EIA-860M lists 2 generating units here, inside ERCOT. Its units entered service between 1988 and 1989.
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
- 2,708.6 MW
- 2,580 MW net summer
- Generating units
- 2
- In service
- 1988–1989
- EIA plant ID
- 6251
Where it is
Loading map…
- County
- Matagorda County, Texas
- Coordinates
- 28.795, -96.0481
- Balancing authority
- ERCO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- STP Nuclear Operating Co
- Primary energy source
- Nuclear
- Technologies
- Nuclear
- Status
- Operating
South Texas Project: FAQ
- Where is South Texas Project?
- In Matagorda 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 South Texas Project?
- 3 GW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
- Who owns South Texas Project?
- EIA-860M names STP Nuclear Operating Co 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 South Texas Project LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — STP Nuclear Operating Co 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 "South Texas Project LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is South Texas Project still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.