South Texas Project
Nuclear power plant in Matagorda County, Texas. 2,708.6 MW of nameplate capacity across 2 generators, operated by STP Nuclear Operating Co.
Also known as South Texas Project Electric Generating Station · EIA plant 6251
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 2,708.6 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- August 1988First generator online
- Operator
- STP Nuclear Operating CoEIA operator ID 21535
- Grid
- ERCOTBalancing authority ERCO
- Price nodes
- 2 ERCOT nodesResource nodes with prices
- Location
- Matagorda County, TX28.7950, −96.0481
- EIA plant ID
- 6251EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power South Texas Project produces
Free · EIA-923Net generation, 2025
21.8 TWh
21,782,126 MWh, final
Capacity factor, 2025
91.8%
2024: 79.5%
January to July 2026
11.9 TWh
Provisional
Range, 2015 to 2025
18.9–22.0
TWh a year. Low 2024, high 2019
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 19,098,939 | Not reported | 12 of 12 |
| 2001 | 19,840,598 | Not reported | 12 of 12 |
| 2002 | 19,049,602 | Not reported | 12 of 12 |
| 2003 | 15,688,541 | Not reported | 12 of 12 |
| 2004 | 21,371,967 | Not reported | 12 of 12 |
| 2005 | 19,789,293 | Not reported | 12 of 12 |
| 2006 | 21,368,269 | Not reported | 12 of 12 |
| 2007 | 22,109,283 | Not reported | 12 of 12 |
| 2008 | 21,492,749 | Not reported | 12 of 12 |
| 2009 | 21,356,148 | Not reported | 12 of 12 |
| 2010 | 21,126,781 | 89.0% | 12 of 12 |
| 2011 | 20,365,896 | 85.8% | 12 of 12 |
| 2012 | 18,544,093 | 77.9% | 12 of 12 |
| 2013 | 17,827,856 | 75.1% | 12 of 12 |
| 2014 | 20,651,667 | 87.0% | 12 of 12 |
| 2015 | 19,400,553 | 81.8% | 12 of 12 |
| 2016 | 21,694,303 | 91.2% | 12 of 12 |
| 2017 | 21,581,476 | 91.0% | 12 of 12 |
| 2018 | 20,687,632 | 87.2% | 12 of 12 |
| 2019 | 21,993,297 | 92.7% | 12 of 12 |
| 2020 | 21,958,757 | Not reported | 12 of 12 |
| 2021 | 20,855,004 | 87.9% | 12 of 12 |
| 2022 | 21,919,885 | 92.4% | 12 of 12 |
| 2023 | 21,787,144 | 91.8% | 12 of 12 |
| 2024 | 18,926,463 | 79.5% | 12 of 12 |
| 2025 | 21,782,126 | 91.8% | 12 of 12 |
| 2026 (provisional, partial year) | 11,850,385 | 86.0% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · ERCOTEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
739,867
million gallons
Consumption, 2024
19,522
million gallons
Source
Colorado River
Surface, Fresh. Recirculating with cooling pond
Watershed stress
Moderate · 0.472
USGS SUI, HUC12 Mad Island Slough-Frontal Matagorda Bay
12 of 12 cooling months report withdrawal. SUI of the source river HUC12 within 3 km. Cooling-pond plants report water circulated through the pond as withdrawal, so withdrawal is far above consumption. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Nuclear | 1,354.3 | August 1988 |
| 2 | Nuclear | 1,354.3 | June 1989 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists STP Nuclear Operating Co as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about South Texas Project
How much power does South Texas Project produce?
South Texas Project reported 21,782,126 MWh (21.8 TWh) of net generation in 2025, a 91.8% capacity factor on 2,708.6 MW of nameplate capacity. From January to July 2026 it reported 11.9 TWh, which is provisional.
Where is South Texas Project?
South Texas Project is in Matagorda County, Texas, at 28.7950, −96.0481. It is in the Electric Reliability Council of Texas, Inc. balancing area (ERCO).
Who operates South Texas Project?
EIA-860M for August 2026 lists STP Nuclear Operating Co as the operator (EIA operator ID 21535). The operator is not always the owner.
When did South Texas Project start operating?
Its first generator began operating in August 1988, according to EIA-860M.
Does InfraMap have power prices for South Texas Project?
Yes. InfraMap has ERCOT day-ahead and real-time prices at 2 price nodes linked to South Texas Project, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- ERCOT day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page