Mark One Power Station
Natural gas power plant in Brazoria County, Texas. 484 MW of nameplate capacity across 8 generators, operated by City of San Antonio - (TX).
Also known as ProEnergy Mark One Power Plant · EIA plant 65372
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Key facts
- Capacity
- 484 MWNameplate
- Generators
- 8 operatingEIA-860M, August 2026
- Operating since
- November 2022First generator online
- Operator
- City of San Antonio - (TX)EIA operator ID 16604
- Grid
- ERCOTBalancing authority ERCO
- Price nodes
- 1 ERCOT nodeResource nodes with prices
- Location
- Brazoria County, TX29.2271, −95.4308
- EIA plant ID
- 65372EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Mark One produces
Free · EIA-923Net generation, 2025
353 GWh
352,736 MWh, final
Capacity factor, 2025
8.3%
2024: Not reported
January to July 2026
221 GWh
Provisional
Range, 2023 to 2025
115.1–352.7
GWh a year. Low 2023, high 2025
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | Not reported | Not reported | 0 of 12 |
| 2021 | Not reported | Not reported | 0 of 12 |
| 2022 | 34,277 | Not reported | 4 of 12 |
| 2023 | 115,108 | 3.6% | 12 of 12 |
| 2024 | 329,288 | Not reported | 12 of 12 |
| 2025 | 352,736 | 8.3% | 12 of 12 |
| 2026 (provisional, partial year) | 220,805 | 9.0% | 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 CAMPDCO₂, 2025
220,781
US short tons. 2024: 203,492
SO₂, 2025
1
US short tons
NOx, 2025
20
US short tons
CO₂ per MWh, calculated
0.63 t
About 1,252 lb per MWh
8 of 8 EPA units reported CO₂ in 2025 (CT-1, CT-2, CT-3, CT-4, CT-5, CT-6, CT-7, CT-8), matched to EIA plant 65372 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CTG-1 | Natural Gas Fired Combustion Turbine | 60.5 | November 2022 |
| CTG-2 | Natural Gas Fired Combustion Turbine | 60.5 | November 2022 |
| CTG-3 | Natural Gas Fired Combustion Turbine | 60.5 | November 2022 |
| CTG-4 | Natural Gas Fired Combustion Turbine | 60.5 | November 2022 |
| CTG-5 | Natural Gas Fired Combustion Turbine | 60.5 | November 2022 |
| CTG-6 | Natural Gas Fired Combustion Turbine | 60.5 | November 2022 |
| CTG-7 | Natural Gas Fired Combustion Turbine | 60.5 | October 2024 |
| CTG-8 | Natural Gas Fired Combustion Turbine | 60.5 | October 2024 |
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 City of San Antonio - (TX) 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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Power plants near Mark One
More plants operated by City of San Antonio - (TX)
Questions about Mark One
How much power does Mark One Power Station produce?
Mark One Power Station reported 352,736 MWh (353 GWh) of net generation in 2025, a 8.3% capacity factor on 484 MW of nameplate capacity. From January to July 2026 it reported 221 GWh, which is provisional.
Where is Mark One Power Station?
Mark One Power Station is in Brazoria County, Texas, at 29.2271, −95.4308. It is in the Electric Reliability Council of Texas, Inc. balancing area (ERCO).
Who operates Mark One Power Station?
EIA-860M for August 2026 lists City of San Antonio - (TX) as the operator (EIA operator ID 16604). The operator is not always the owner.
When did Mark One Power Station start operating?
Its first generator began operating in November 2022, according to EIA-860M.
Does InfraMap have power prices for Mark One Power Station?
Yes. InfraMap has ERCOT day-ahead and real-time prices at 1 price node linked to Mark One Power Station, 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)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- ERCOT day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page