South Texas Project
South Texas Project is a nuclear plant in Matagorda County, Texas, operated by STP Nuclear Operating Co. By nameplate capacity it is the 19th-largest power plant in the United States and the second-largest in Texas. Among the 56 nuclear plants in the country it is the sixth-largest. Its biggest unit, rated at 1,354 MW, is the largest single generator in Texas.
Nameplate capacity, 2025
2,709 MW
2,580 MW net summer capacity
2 operable units
- Nuclear2,709 MW100%
Unit by unit, 1988 to 2025
operating in 2025bar height follows unit size
Unit 1 Nuclear, 1,354 MW, 1988
Unit 2 Nuclear, 1,354 MW, 1989
Among Texas’s plants
Largest plants in the state by nameplate capacity, with the plants ranked next to this one.
- 1W A Parish4,008 MW
- 2South Texas Projectthis plant
- 3Comanche Peak2,430 MW
- 4Martin Lake2,380 MW
Other rankings
- Nuclear plants in Texas
- 1st of 2
- Plants in the ERCOT (Texas) balancing area
- 2nd of 935
Operable 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 |
Who owns it
Shares are weighted by the nameplate capacity of each unit an owner holds.
| Owner | Share of capacity |
|---|---|
| Constellation Nuclear | 44.0% |
| City of San Antonio (TX) | 40.0% |
| Austin Energy | 16.0% |
Grid and site
- Balancing area
- ERCOT (Texas)
- Reliability region
- Texas Reliability Entity
- Highest grid connection voltage
- 256 kV
- Water source
- Colorado River
- Nearest town on record
- Wadsworth
- Operator type
- Independent producer
- Coordinates
- 28.795°N, 96.048°W
Closest plants
| Plant | Runs on | Capacity | Distance |
|---|---|---|---|
| Regis Palacios | Battery storage | 9.9 MW | 10.3 mi west |
| Peyton Creek Wind Farm LLC | Wind | 151 MW | 11.7 mi east |
| Peyton Creek Wind Farm II | Wind | 243 MW | 13.1 mi northeast |
| HEB00292 | Natural gas | 1.2 MW | 14.0 mi northeast |
| SMT Bay City LLC | Battery storage | 10 MW | 14.1 mi north |
| Pavlov | Battery storage | 9.9 MW | 14.5 mi north |
| Prairie Switch Wind LLC | Wind | 163 MW | 20.7 mi north |
| Red Tailed Hawk Solar LLC | Solar | 360 MW | 25.8 mi north |