Gregory Power Facility
San Patricio County, Texas · EIA plant ID 55086 · Operator: Gregory Power Partners LP
Nameplate470MWSummer 366 MW
Generators3in service
Net generation604GWh12 mo to Aug 2026
Capacity factor19%gas/coal/oil units, summer MW
Heat rate8,856Btu/kWhfossil units, electric fuel, HHV
First online2000Runs as intermediate
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 3,171.8 | — | — |
| 2002 | 2,891.6 | — | — |
| 2003 | 2,739.3 | 75.9% | 4,249 |
| 2004 | 2,793.1 | 77.2% | 4,340 |
| 2005 | 2,671.1 | 74.0% | 4,340 |
| 2006 | 2,706 | 75.0% | 4,340 |
| 2007 | 2,816 | 87.8% | 4,340 |
| 2008 | 2,914.3 | 90.6% | 4,220 |
| 2009 | 2,743.3 | 85.6% | 4,228 |
| 2010 | 2,729.7 | 85.1% | 4,210 |
| 2011 | 2,671.6 | 83.3% | 4,211 |
| 2012 | 2,748.3 | 85.5% | 4,211 |
| 2013 | 2,664.6 | 83.1% | 4,249 |
| 2014 | 2,415.8 | 75.3% | 4,388 |
| 2015 | 2,663 | 83.1% | 4,365 |
| 2016 | 2,105.7 | 65.5% | 4,835 |
| 2017 | -5.6 | -0.2% | — |
| 2018 | -6.4 | -0.2% | — |
| 2019 | 367.3 | 11.5% | 9,550 |
| 2020 | 517.7 | 16.1% | 8,662 |
| 2021 | 725.8 | 22.6% | 9,077 |
| 2022 | 699.3 | 21.8% | 9,093 |
| 2023 | 480.6 | 15.0% | 9,626 |
| 2024 | 841.1 | 26.2% | 8,972 |
| 2025 | 639.9 | 20.0% | 8,661 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GT1A | Natural Gas Fired Combined Cycle | CT | 184.9 | 141 | Jul 2000 | Operating | — | coming soon |
| GT1B | Natural Gas Fired Combined Cycle | CT | 184.9 | 140 | Jul 2000 | Operating | — | coming soon |
| STG | Natural Gas Fired Combined Cycle | CA | 100 | 85 | Jul 2000 | Operating | — | coming soon |
Owner / operator
Operator: Gregory Power Partners LP. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Gregory Power Holdings, LLC | 100.0% | 470 MW |
Nearby plants
Within 80 km.
| Ingleside Cogeneration | 517 MW | 1.7 km |
| Regis Gregory | 10 MW | 6.2 km |
| Midway Wind, LLC | 163 MW | 8.4 km |
| EC&R Papalote Creek II LLC | 200 MW | 12.4 km |
| Nueces Bay | 730 MW | 17.6 km |
| Peacock Energy Project | 150 MW | 17.7 km |