SOUTH TEXAS PROJECT
OperatingNuclear power plant
- Capacity
- 2,709 MW
- Primary fuel
- Nuclear
- County
- Matagorda County
- Operator
- STP NUCLEAR OPERATING CO
- Status
- Operating
- Commissioned
- 1988
- EIA plant ID
- 6251
- Generators
- 2
- Technology
- Nuclear
- Net generation (2024)
- 18,926 GWh
- Capacity factor (2024, EIA nameplate)
- 80%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 28.7950, -96.0481
SOUTH TEXAS PROJECT, a 2,709 MW Nuclear power plant in Matagorda County, Texas. Operated by STP NUCLEAR OPERATING CO, commissioned 1988.
How SOUTH TEXAS PROJECT compares
With 2,709 MW of capacity, SOUTH TEXAS PROJECT ranks 2nd among the 307 operating power plants Bywatts maps in Texas and is the largest of the 2 operating Nuclear plants in the state. It accounts for about 53% of Texas's operating Nuclear capacity and 2.6% of all operating capacity in the state. Nationally it is the 3rd-largest of the 55 operating Nuclear plants in the database. Commissioned in 1988, it is older than 66% of the 303 operating Texas plants with a recorded commissioning year.
EIA-860 lists 2 generators at the site with 2,709 MW of nameplate capacity, all nuclear technology. Net generation was 18,926 GWh in 2024 (an 80% capacity factor), down 14% from 2022. Its generators came online between 1988 and 1989.
Grid neighborhood
The closest transmission line found within 10 miles is a 345 kV line owned by AEP TEXAS CENTRAL COMPANY, under 0.1 miles away.
Computed by Bywatts from HIFLD power plant and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
SOUTH TEXAS PROJECT is a 2,709 MW nuclear power plant in Matagorda County, TX, operated by STP NUCLEAR OPERATING CO, commissioned in 1988. Matagorda County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.4 of 5 at the 85th national percentile. Hurricane is the leading peril, rated Relatively High by FEMA at the 98th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a nuclear plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Matagorda County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Hurricane | Relatively High | 98th | 4.9 of 5 | 0.19 |
| Wildfire | Relatively Low | 72nd | 3.9 of 5 | <0.01 |
| Coastal flooding | Relatively Moderate | 58th | 3.3 of 5 | 3.7 |
| Riverine flooding | Relatively Low | 55th | 3.2 of 5 | 1.0 |
| Heat wave | Relatively Low | 51st | 3.1 of 5 | 14.7 |
| Hail | Relatively Low | 33rd | 2.3 of 5 | 1.1 |
| Lightning | Relatively Moderate | 33rd | 2.3 of 5 | 64.0 |
| Tornado | Relatively Low | 28th | 2.1 of 5 | 0.73 |
| Strong wind | Relatively Low | 16th | 1.6 of 5 | 0.72 |
| Winter weather | Very Low | 11th | 1.4 of 5 | 0.91 |
| Ice storm | Relatively Low | 11th | 1.4 of 5 | 0.56 |
| Earthquake | Very Low | 10th | 1.4 of 5 | <0.01 |
Model hail, wind and flood exposure for Matagorda County in the weather risk calculator
Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.
Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.