South Texas Project
Nuclear power plant · Matagorda County, Texas
Nameplate capacity
2,709 MW
Rank in Texas
#2
of 1,071 plants
In service since
1988
August 1988
Details
- Primary fuel
- Nuclear
- Technology
- Nuclear
- Operator
- STP Nuclear Operating Co
- County
- Matagorda County
- Generating units
- 2
- Share of state capacity
- 1.35%
- Rank among nuclear plants in Texas
- #1 of 2
- EIA plant code
- 6251
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Nuclear | 1,354 MW | 1,300 MW | 1988 | Operating |
| 2 | Nuclear | 1,354 MW | 1,280 MW | 1989 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Texas
| W A Parish | Coal | 4,008 MW |
| Comanche Peak | Nuclear | 2,430 MW |
| Martin Lake | Coal | 2,380 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 2,709 MW solar plant and a 2,709 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Texas power plants · What Texas actually generates