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191.1 MW Natural Gas operating in Galveston, TX — Electric Reliability Council of Texas, Inc.
191.1 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combined Cycle
Technology
1986
Operating Since
Coordinates
33.1562, -115.6423
County
Galveston, TX
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | South Houston Green Power LLC | Marathon Petroleum | — |
| Owner(s) | Marathon Petroleum Company LP | Marathon Petroleum | — |
| Status | Operating | — | — |
Power Station 4 is a 191.1 MW natural gas-fired combined cycle power plant located in Galveston County, Texas. The plant began operating in 1986 and consists of 3 generators. It is owned by Marathon Petroleum and operated by South Houston Green Power LLC. The plant operates within the Electric Reliability Council of Texas, Inc. (ERCOT) balancing authority and the TRE NERC region.
In the most recent year of data, Power Station 4 generated 401,440 MWh of electricity, achieving a capacity factor of 23.8%. The plant is ranked 122 out of 144 power plants in Texas and 760 out of 945 plants nationally. Recent news coverage of the plant includes 7 articles related to industry topics, 1 regarding hazards, 1 on deals, and 1 concerning the electric grid.
Generated from EIA, GEM, and public data sources
ISO/RTO
ERCOT
Market
ISO/RTO Member
NERC Region
TRE — Texas Reliability Entity
Balancing Authority
Electric Reliability Council of Texas, Inc. (ERCO)
Grid Voltage
138.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Industrial
Sector
Industrial CHP
15.9K MWh
Latest Month
401.4K MWh
Annual Generation
23.8%
Capacity Factor
CO₂ Intensity
670 lb/MWh
NOx
2 lb/MWh
SO₂
0.006 lb/MWh
CH₄
0.013 lb/MWh
N₂O
0.001 lb/MWh
Capacity Factor
37.6%
Annual Net Gen
629 GWh
CO₂eq
671 lb/MWh
Subregion
ERCOT All
2013
$965/kW
Est. Construction Cost
Total estimated cost: $184.4M
Point of Interconnection
Nearest Substation
Tejas Substation · 138 kV
Substation Distance
< 10 km
Operator
Texas-New Mexico Power
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ERCOT
LMP Node
AMOCOOIL
Pricing Hub
HB_HOUSTON
Node Source
EIA-860 direct report
Last updated 2026-03-26
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