South Texas Project

OperatingNuclear

Ranked #1 of 2 Nuclear plants in TX#6 of 57 nationally

2708.6 MW Nuclear operating in Matagorda, TX — Electric Reliability Council of Texas, Inc.

EIAGEMWD

2,708.6 MW

Nameplate Capacity

Generators

units

Nuclear

Technology

1988

Operating Since

Location

Coordinates

28.7950, -96.0481

County

Matagorda, TX

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Peyton Creek Wind Farm LLC
Wind151.2 MW · 16.0 km

Ownership & Operator

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	—

Ownership Chain

About

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 Wikipedia

The 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

Wikipedia EIA Plant Profile Wikidata Global Energy Monitor

Engineering & Generators

Grid Context

NERC Region

TRE

Balancing Authority

Electric Reliability Council of Texas, Inc.

Grid Voltage

256 kV

Regulatory Status

Entity Type

Municipal

Sector

IPP Non-CHP

Generation

2.0M MWh

Latest Month

21.8M MWh

Annual Generation

91.9%

Capacity Factor

Jan 2023 – Dec 2025

Financial Data

No financial data available for this plant.

Pricing & Market Data

HIGH confidence

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

Secondary Zone

LZ_SOUTH

Location Type

Resource Node

Node Source

Curated node match

News & Articles (10)Beta

Deals·m and a

Constellation to Sell 4.4 GW of PJM Gas Power Assets to LS Power for $5B in Regulatory Divestiture

Competitive generation giant Constellation Energy has agreed to sell approximately 4.4 GW of natural gas–fired generation capacity in PJM Interconnection to LS Power Equity Advisors for $5 billion, marking the largest single tranche of divestitures required to resolve antitrust and market-power c...

Constellation Energy (seller)LS Power (buyer)

POWER Magazine·1 weeks ago

Deals·m and a

Constellation to sell 4.4GW of PJM assets to LS Power for $5B as part of Calpine acquisition

Constellation Energy Corporation will sell a portfolio of generation assets in PJM to LS Power for $5 billion, fulfilling DOJ requirements from its Calpine acquisition.

Constellation Energy Corporation (seller)LS Power (buyer)

Power Engineering·1 weeks ago