Topaz Generating
Natural gas power plant in Galveston County, Texas. 605 MW of nameplate capacity across 10 generators, operated by City of San Antonio - (TX).
Also known as EIA plant 63688
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Key facts
- Capacity
- 605 MWNameplate
- Generators
- 10 operatingEIA-860M, August 2026
- Operating since
- July 2021First 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
- Galveston County, TX29.4264, −94.9767
- EIA plant ID
- 63688EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Topaz Generating produces
Free · EIA-923Net generation, 2025
599 GWh
598,589 MWh, final
Capacity factor, 2025
11.3%
2024: 13.0%
January to July 2026
234 GWh
Provisional
Range, 2022 to 2025
598.6–722.3
GWh a year. Low 2025, high 2023
| 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 | 168,638 | Not reported | 6 of 12 |
| 2022 | 663,891 | 12.5% | 12 of 12 |
| 2023 | 722,349 | 13.6% | 12 of 12 |
| 2024 | 688,707 | 13.0% | 12 of 12 |
| 2025 | 598,589 | 11.3% | 12 of 12 |
| 2026 (provisional, partial year) | 233,988 | 7.6% | 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
368,386
US short tons. 2024: 420,501
SO₂, 2025
2
US short tons
NOx, 2025
41
US short tons
CO₂ per MWh, calculated
0.62 t
About 1,231 lb per MWh
10 of 10 EPA units reported CO₂ in 2025 (CT-1, CT-10, CT-2, CT-3, CT-4, CT-5, CT-6, CT-7, and others), matched to EIA plant 63688 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 | July 2021 |
| CTG-2 | Natural Gas Fired Combustion Turbine | 60.5 | July 2021 |
| CTG-3 | Natural Gas Fired Combustion Turbine | 60.5 | July 2021 |
| CTG-4 | Natural Gas Fired Combustion Turbine | 60.5 | July 2021 |
| CTG-5 | Natural Gas Fired Combustion Turbine | 60.5 | July 2021 |
| CTG-6 | Natural Gas Fired Combustion Turbine | 60.5 | July 2021 |
| CTG-7 | Natural Gas Fired Combustion Turbine | 60.5 | July 2021 |
| CTG-8 | Natural Gas Fired Combustion Turbine | 60.5 | August 2021 |
| CTG-9 | Natural Gas Fired Combustion Turbine | 60.5 | October 2021 |
| CTG10 | Natural Gas Fired Combustion Turbine | 60.5 | August 2021 |
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 Topaz Generating
More plants operated by City of San Antonio - (TX)
Questions about Topaz Generating
How much power does Topaz Generating produce?
Topaz Generating reported 598,589 MWh (599 GWh) of net generation in 2025, a 11.3% capacity factor on 605 MW of nameplate capacity. From January to July 2026 it reported 234 GWh, which is provisional.
Where is Topaz Generating?
Topaz Generating is in Galveston County, Texas, at 29.4264, −94.9767. It is in the Electric Reliability Council of Texas, Inc. balancing area (ERCO).
Who operates Topaz Generating?
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 Topaz Generating start operating?
Its first generator began operating in July 2021, according to EIA-860M.
Does InfraMap have power prices for Topaz Generating?
Yes. InfraMap has ERCOT day-ahead and real-time prices at 1 price node linked to Topaz Generating, 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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page