Gregory Power Plant
Natural gas power plant in San Patricio County, Texas. 469.8 MW of nameplate capacity across 3 generators, operated by Gregory Power Partners LLC.
Also known as Gregory Cogeneration Plant · EIA plant 55086
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Key facts
- Capacity
- 469.8 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- July 2000First generator online
- Operator
- Gregory Power Partners LLCEIA operator ID 7667
- Grid
- ERCOTBalancing authority ERCO
- Price nodes
- None linkedNo verified ISO node
- Location
- San Patricio County, TX27.8893, −97.2584
- EIA plant ID
- 55086EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Gregory produces
Free · EIA-923Net generation, 2025
640 GWh
639,865 MWh, final
Capacity factor, 2025
15.5%
2024: Not reported
January to July 2026
241 GWh
Provisional
Range, 2015 to 2025
−0.0–2.7
TWh a year. Low 2018, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 1,525,315 | Not reported | 12 of 12 |
| 2001 | 3,171,824 | Not reported | 12 of 12 |
| 2002 | 2,891,620 | Not reported | 12 of 12 |
| 2003 | 2,739,340 | Not reported | 12 of 12 |
| 2004 | 2,793,070 | Not reported | 12 of 12 |
| 2005 | 2,671,097 | Not reported | 12 of 12 |
| 2006 | 2,706,019 | Not reported | 12 of 12 |
| 2007 | 2,815,988 | Not reported | 12 of 12 |
| 2008 | 2,914,287 | Not reported | 12 of 12 |
| 2009 | 2,743,297 | Not reported | 12 of 12 |
| 2010 | 2,729,696 | 72.1% | 12 of 12 |
| 2011 | 2,671,581 | 70.6% | 12 of 12 |
| 2012 | 2,748,262 | 72.4% | 12 of 12 |
| 2013 | 2,664,620 | Not reported | 12 of 12 |
| 2014 | 2,415,807 | 63.8% | 12 of 12 |
| 2015 | 2,663,022 | 70.4% | 12 of 12 |
| 2016 | 2,105,743 | 55.5% | 12 of 12 |
| 2017 | −5,627 | -0.1% | 12 of 12 |
| 2018 | −6,353 | -0.2% | 12 of 12 |
| 2019 | 367,253 | 9.7% | 12 of 12 |
| 2020 | 517,659 | 13.6% | 12 of 12 |
| 2021 | 725,762 | 19.2% | 12 of 12 |
| 2022 | 699,287 | 18.5% | 12 of 12 |
| 2023 | 480,584 | 12.7% | 12 of 12 |
| 2024 | 841,063 | Not reported | 12 of 12 |
| 2025 | 639,865 | 15.5% | 12 of 12 |
| 2026 (provisional, partial year) | 240,943 | 10.1% | 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 accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
328,484
US short tons. 2024: 449,177
SO₂, 2025
2
US short tons
NOx, 2025
91
US short tons
CO₂ per MWh, calculated
0.51 t
About 1,027 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (101, 102), matched to EIA plant 55086 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, USGSWithdrawal, 2024
272
million gallons
Consumption, 2024
162
million gallons
Source
San Patricio Municipality
Surface, Fresh. Induced-draft tower
Watershed stress
Low · 0.210
USGS SUI, HUC12 Kinney Bayou-Frontal Corpus Christi Bay
12 of 12 cooling months report withdrawal. SUI of the HUC12 containing the plant. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GT1A | Natural Gas Fired Combined Cycle | 184.9 | July 2000 |
| GT1B | Natural Gas Fired Combined Cycle | 184.9 | July 2000 |
| STG | Natural Gas Fired Combined Cycle | 100.0 | July 2000 |
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 Gregory Power Partners LLC 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 Gregory
Questions about Gregory
How much power does Gregory Power Plant produce?
Gregory Power Plant reported 639,865 MWh (640 GWh) of net generation in 2025, a 15.5% capacity factor on 469.8 MW of nameplate capacity. From January to July 2026 it reported 241 GWh, which is provisional.
Where is Gregory Power Plant?
Gregory Power Plant is in San Patricio County, Texas, at 27.8893, −97.2584. It is in the Electric Reliability Council of Texas, Inc. balancing area (ERCO).
Who operates Gregory Power Plant?
EIA-860M for August 2026 lists Gregory Power Partners LLC as the operator (EIA operator ID 7667). The operator is not always the owner.
When did Gregory Power Plant start operating?
Its first generator began operating in July 2000, according to EIA-860M.
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
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page