Search
Search plants, projects, owners, and states
Search plants, projects, owners, and states
2708.6 MW Nuclear operating in Matagorda, TX — Electric Reliability Council of Texas, Inc.
2,708.6 MW
Nameplate Capacity
2
Generators
units
Nuclear
Technology
1988
Operating Since
Coordinates
28.7950, -96.0481
County
Matagorda, TX
Nearby Plants
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | STP Nuclear Operating Co | STP Nuclear Operating | — |
| Owner(s) | Austin Energy, City of San Antonio - (TX), Constellation Nuclear | Constellation Energy | — |
| Status | Operating | operating | — |
The South Texas Project Electric Generating Station, is a nuclear power station southwest of Bay City, Texas, United States. STP occupies a 12,200-acre (4,900 ha) site west of the Colorado River about 90 miles (140 km) southwest of Houston. It consists of two Westinghouse Pressurized Water Reactors and is cooled by a 7,000-acre (2,800 ha) reservoir, which eliminates the need for cooling towers.
Read more on WikipediaThe South Texas Project is a nuclear power plant located in Matagorda County, Texas. It has a total capacity of 2708.6 MW across two nuclear reactors. The plant began operating in 1988 and is owned by Constellation Energy. The operator is STP Nuclear Operating Co. South Texas Project ranks as the largest nuclear plant in Texas (1 of 2) and the fifth-largest in the United States (5 of 55).
In the most recent year with available data, the plant generated 21,782,126 MWh of electricity, achieving a capacity factor of 91.9%. The South Texas Project operates within the Electric Reliability Council of Texas (ERCOT) balancing authority, and is within the Texas Reliability Entity (TRE) NERC region.
Generated from EIA, GEM, and public data sources
ISO/RTO
ERCOT
Market
ISO/RTO Member
NERC Region
TRE — Texas Reliability Entity
Balancing Authority
2.0M MWh
Latest Month
21.8M MWh
Annual Generation
91.9%
Capacity Factor
Point of Interconnection
Nearest Substation
South Texas Project Switchyard · 345 kV
Substation Distance
0.179 km
Operator
CenterPoint Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ERCOT
LMP Node
STP_STP_G1
Pricing Hub
HB_SOUTH
Alt. Hub / Zone
LZ_SOUTH
Location Type
Resource Node
Node Source
Curated node match
Last updated 2026-03-26
View all 10 articlesElectric Reliability Council of Texas, Inc. (ERCO)
Grid Voltage
256.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Municipal
Sector
IPP Non-CHP