Midlothian Energy Facility
Natural gas power plant in Ellis County, Texas. 1,734 MW of nameplate capacity across 6 generators, operated by Midlothian Energy LLC.
Also known as EIA plant 55091
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 1,734 MWNameplate
- Generators
- 6 operatingEIA-860M, August 2026
- Operating since
- May 2000First generator online
- Operator
- Midlothian Energy LLCEIA operator ID 12501
- Grid
- ERCOTBalancing authority ERCO
- Price nodes
- 3 ERCOT nodesResource nodes with prices
- Location
- Ellis County, TX32.4302, −97.0537
- EIA plant ID
- 55091EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Midlothian Energy Facility produces
Free · EIA-923Net generation, 2025
6.95 TWh
6,947,910 MWh, final
Capacity factor, 2025
45.7%
2024: Not reported
January to July 2026
4.06 TWh
Provisional
Range, 2016 to 2025
3.2–6.9
TWh a year. Low 2017, high 2025
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 4,081,367 | Not reported | 12 of 12 |
| 2002 | 5,966,805 | Not reported | 12 of 12 |
| 2003 | 4,399,095 | Not reported | 12 of 12 |
| 2004 | 3,611,379 | Not reported | 12 of 12 |
| 2005 | 6,712,599 | Not reported | 12 of 12 |
| 2006 | 7,057,168 | Not reported | 12 of 12 |
| 2007 | 6,695,530 | Not reported | 12 of 12 |
| 2008 | 5,146,696 | Not reported | 12 of 12 |
| 2009 | 3,716,607 | Not reported | 12 of 12 |
| 2010 | 3,012,329 | 19.8% | 12 of 12 |
| 2011 | 4,118,326 | 27.1% | 12 of 12 |
| 2012 | 4,930,168 | 32.4% | 12 of 12 |
| 2013 | 5,467,485 | 36.0% | 12 of 12 |
| 2014 | 5,518,344 | 36.3% | 12 of 12 |
| 2015 | 5,673,797 | Not reported | 11 of 12 |
| 2016 | 5,875,636 | 38.6% | 12 of 12 |
| 2017 | 3,239,653 | 21.3% | 12 of 12 |
| 2018 | 5,539,329 | 36.5% | 12 of 12 |
| 2019 | 5,536,838 | 36.5% | 12 of 12 |
| 2020 | 3,904,672 | Not reported | 12 of 12 |
| 2021 | 4,070,826 | Not reported | 12 of 12 |
| 2022 | 4,884,707 | Not reported | 12 of 12 |
| 2023 | 5,230,004 | 34.4% | 12 of 12 |
| 2024 | 6,338,657 | Not reported | 12 of 12 |
| 2025 | 6,947,910 | 45.7% | 12 of 12 |
| 2026 (provisional, partial year) | 4,064,350 | 46.1% | 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 account · ERCOTEmissions
Free · EPA CAMPDCO₂, 2025
3.16M
US short tons. 2024: 2.88M
SO₂, 2025
16
US short tons
NOx, 2025
439
US short tons
CO₂ per MWh, calculated
0.46 t
About 910 lb per MWh
6 of 6 EPA units reported CO₂ in 2025 (STK1, STK2, STK3, STK4, STK5, STK6), matched to EIA plant 55091 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
Not reported
million gallons as reported; not used, see note
Consumption, 2024
Not reported
million gallons
Source
Not reported
Dry cooling
Watershed stress
Low · 0.297
USGS SUI, HUC12 Soap Creek
0 of 72 cooling months report withdrawal. Dry cooling with no reported withdrawal; not tested. Consumption is below 5% of a large reported withdrawal, so the withdrawal is not used. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| STK1 | Natural Gas Fired Combined Cycle | 289.0 | May 2000 |
| STK2 | Natural Gas Fired Combined Cycle | 289.0 | May 2000 |
| STK3 | Natural Gas Fired Combined Cycle | 289.0 | July 2000 |
| STK4 | Natural Gas Fired Combined Cycle | 289.0 | September 2000 |
| STK5 | Natural Gas Fired Combined Cycle | 289.0 | August 2001 |
| STK6 | Natural Gas Fired Combined Cycle | 289.0 | September 2001 |
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 Midlothian 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 Midlothian Energy Facility
How much power does Midlothian Energy Facility produce?
Midlothian Energy Facility reported 6,947,910 MWh (6.95 TWh) of net generation in 2025, a 45.7% capacity factor on 1,734 MW of nameplate capacity. From January to July 2026 it reported 4.06 TWh, which is provisional.
Where is Midlothian Energy Facility?
Midlothian Energy Facility is in Ellis County, Texas, at 32.4302, −97.0537. It is in the Electric Reliability Council of Texas, Inc. balancing area (ERCO).
Who operates Midlothian Energy Facility?
EIA-860M for August 2026 lists Midlothian Energy LLC as the operator (EIA operator ID 12501). The operator is not always the owner.
When did Midlothian Energy Facility start operating?
Its first generator began operating in May 2000, according to EIA-860M.
Does InfraMap have power prices for Midlothian Energy Facility?
Yes. InfraMap has ERCOT day-ahead and real-time prices at 3 price nodes linked to Midlothian Energy Facility, 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