Hays Energy Project
Natural gas power plant in Hays County, Texas. 989 MW of nameplate capacity across 4 generators, operated by Hays Energy, LLC.
Also known as EIA plant 55144
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Key facts
- Capacity
- 989 MWNameplate
- Generators
- 4 operatingEIA-860M, August 2026
- Operating since
- April 2002First generator online
- Operator
- Hays Energy, LLCEIA operator ID 1074
- Grid
- ERCOTBalancing authority ERCO
- Price nodes
- 2 ERCOT nodesResource nodes with prices
- Location
- Hays County, TX29.7806, −97.9894
- EIA plant ID
- 55144EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Hays Energy Project produces
Free · EIA-923Net generation, 2025
5.34 TWh
5,338,430 MWh, final
Capacity factor, 2025
61.6%
2024: 62.4%
January to July 2026
3.08 TWh
Provisional
Range, 2015 to 2025
2.4–5.4
TWh a year. Low 2020, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 522,570 | Not reported | 7 of 12 |
| 2002 | 1,931,583 | Not reported | 12 of 12 |
| 2003 | 2,566,255 | Not reported | 12 of 12 |
| 2004 | 2,111 | Not reported | 12 of 12 |
| 2005 | 3,515,113 | Not reported | 12 of 12 |
| 2006 | 4,300,004 | Not reported | 12 of 12 |
| 2007 | 3,693,857 | Not reported | 12 of 12 |
| 2008 | 5,206,701 | Not reported | 12 of 12 |
| 2009 | 3,845,913 | Not reported | 12 of 12 |
| 2010 | 2,930,341 | 33.8% | 12 of 12 |
| 2011 | 3,067,675 | 35.4% | 12 of 12 |
| 2012 | 1,887,038 | 21.7% | 12 of 12 |
| 2013 | 2,633,954 | 30.4% | 12 of 12 |
| 2014 | 2,399,094 | 27.7% | 12 of 12 |
| 2015 | 4,543,717 | 52.4% | 12 of 12 |
| 2016 | 3,964,130 | 45.6% | 12 of 12 |
| 2017 | 2,715,175 | 31.3% | 12 of 12 |
| 2018 | 3,060,201 | Not reported | 12 of 12 |
| 2019 | 3,119,338 | 36.0% | 12 of 12 |
| 2020 | 2,389,854 | 27.5% | 12 of 12 |
| 2021 | 2,777,158 | Not reported | 12 of 12 |
| 2022 | 3,478,985 | Not reported | 12 of 12 |
| 2023 | 4,691,736 | Not reported | 12 of 12 |
| 2024 | 5,417,165 | 62.4% | 12 of 12 |
| 2025 | 5,338,430 | 61.6% | 12 of 12 |
| 2026 (provisional, partial year) | 3,082,216 | 61.3% | 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
2.44M
US short tons. 2024: 2.44M
SO₂, 2025
12
US short tons
NOx, 2025
314
US short tons
CO₂ per MWh, calculated
0.46 t
About 915 lb per MWh
4 of 4 EPA units reported CO₂ in 2025 (STK1, STK2, STK3, STK4), matched to EIA plant 55144 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
722
million gallons
Consumption, 2024
722
million gallons
Source
GBRA/CITY OF SAN MARCOS; GBRA/City of San Marcos
Surface, Brackish. Induced-draft tower
Watershed stress
Low · 0.318
USGS SUI, HUC12 Upper York Creek
24 of 48 cooling months report withdrawal. Saline, brackish or ocean intake; not tested. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| U1 | Natural Gas Fired Combined Cycle | 241.7 | May 2002 |
| U2 | Natural Gas Fired Combined Cycle | 241.7 | April 2002 |
| U3 | Natural Gas Fired Combined Cycle | 252.8 | August 2002 |
| U4 | Natural Gas Fired Combined Cycle | 252.8 | August 2002 |
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 Hays Energy, 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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Questions about Hays Energy Project
How much power does Hays Energy Project produce?
Hays Energy Project reported 5,338,430 MWh (5.34 TWh) of net generation in 2025, a 61.6% capacity factor on 989 MW of nameplate capacity. From January to July 2026 it reported 3.08 TWh, which is provisional.
Where is Hays Energy Project?
Hays Energy Project is in Hays County, Texas, at 29.7806, −97.9894. It is in the Electric Reliability Council of Texas, Inc. balancing area (ERCO).
Who operates Hays Energy Project?
EIA-860M for August 2026 lists Hays Energy, LLC as the operator (EIA operator ID 1074). The operator is not always the owner.
When did Hays Energy Project start operating?
Its first generator began operating in April 2002, according to EIA-860M.
Does InfraMap have power prices for Hays Energy Project?
Yes. InfraMap has ERCOT day-ahead and real-time prices at 2 price nodes linked to Hays Energy Project, 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
- 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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page