H Wilson Sundt Generating Station
Natural gas power plant in Pima County, Arizona. 528.9 MW of nameplate capacity across 14 generators, operated by Tucson Electric Power Co.
Also known as EIA plant 126
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Key facts
- Capacity
- 528.9 MWNameplate
- Generators
- 14 operatingEIA-860M, August 2026
- Operating since
- June 1962First generator online
- Operator
- Tucson Electric Power CoEIA operator ID 24211
- Grid
- TEPCBalancing authority TEPC
- Price nodes
- None linkedNo verified ISO node
- Location
- Pima County, AZ32.1600, −110.9047
- EIA plant ID
- 126EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power H Wilson Sundt produces
Free · EIA-923Net generation, 2025
1.64 TWh
1,637,535 MWh, final. 10 of 12 months reported
Capacity factor, 2025
42.4%
2024: 38.9%
January to July 2026
761 GWh
Provisional. 6 of 7 months reported
Range, 2015 to 2024
0.8–1.8
TWh a year. Low 2017, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 1,639,965 | Not reported | 12 of 12 |
| 2001 | 1,645,666 | Not reported | 12 of 12 |
| 2002 | 1,403,955 | Not reported | 12 of 12 |
| 2003 | 768,581 | Not reported | 9 of 12 |
| 2004 | 1,150,577 | Not reported | 12 of 12 |
| 2005 | 1,152,849 | Not reported | 12 of 12 |
| 2006 | 942,775 | Not reported | 12 of 12 |
| 2007 | 1,038,986 | Not reported | 12 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | 240,320 | Not reported | 4 of 12 |
| 2010 | 856,436 | 17.5% | 12 of 12 |
| 2011 | 841,768 | 18.8% | 11 of 12 |
| 2012 | 803,246 | 16.4% | 12 of 12 |
| 2013 | 428,279 | 15.1% | 7 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | 771,756 | Not reported | 12 of 12 |
| 2016 | 777,277 | Not reported | 12 of 12 |
| 2017 | 752,410 | 15.4% | 12 of 12 |
| 2018 | 1,412,423 | 28.9% | 12 of 12 |
| 2019 | 232,905 | Not reported | 2 of 12 |
| 2020 | 1,089,504 | Not reported | 9 of 12 |
| 2021 | 818,629 | 19.3% | 11 of 12 |
| 2022 | 937,837 | 20.2% | 12 of 12 |
| 2023 | 707,608 | 30.8% | 6 of 12 |
| 2024 | 1,805,541 | 38.9% | 12 of 12 |
| 2025 | 1,637,535 | 42.4% | 10 of 12 |
| 2026 (provisional, partial year) | 760,771 | 33.1% | 6 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
814,835
US short tons. 2024: 663,191
SO₂, 2025
24
US short tons
NOx, 2025
1,238
US short tons
2 of 2 EPA units reported CO₂ in 2025 (1, 2, 3, 4), matched to EIA plant 126 through the EPA–EIA crosswalk.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
691
million gallons
Consumption, 2024
592
million gallons
Source
Wells
Ground, Fresh. Induced-draft tower
Watershed stress
High · 0.712
USGS SUI, HUC12 Julian Wash
12 of 12 cooling months report withdrawal. Groundwater user; SUI describes surface water and is context only. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 4 | Natural Gas Steam Turbine | 173.3 | July 1967 |
| GT1 | Natural Gas Fired Combustion Turbine | 27.0 | December 1972 |
| GT2 | Natural Gas Fired Combustion Turbine | 27.0 | December 1972 |
| RIC1 | Natural Gas Internal Combustion Engine | 18.8 | March 2020 |
| RIC2 | Natural Gas Internal Combustion Engine | 18.8 | March 2020 |
| RIC3 | Natural Gas Internal Combustion Engine | 18.8 | March 2020 |
| RIC4 | Natural Gas Internal Combustion Engine | 18.8 | March 2020 |
| RIC5 | Natural Gas Internal Combustion Engine | 18.8 | March 2020 |
| RIC6 | Natural Gas Internal Combustion Engine | 18.8 | December 2019 |
| RIC7 | Natural Gas Internal Combustion Engine | 18.8 | December 2019 |
| RIC8 | Natural Gas Internal Combustion Engine | 18.8 | December 2019 |
| RIC9 | Natural Gas Internal Combustion Engine | 18.8 | December 2019 |
| RIC10 | Natural Gas Internal Combustion Engine | 18.8 | December 2019 |
| ST3 | Natural Gas Steam Turbine | 113.6 | June 1962 |
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 Tucson Electric Power Co 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 H Wilson Sundt
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Questions about H Wilson Sundt
How much power does H Wilson Sundt Generating Station produce?
H Wilson Sundt Generating Station reported 1,637,535 MWh (1.64 TWh) of net generation in 2025, a 42.4% capacity factor on 528.9 MW of nameplate capacity. From January to July 2026 it reported 761 GWh, which is provisional. 10 of 12 months were reported for 2025.
Where is H Wilson Sundt Generating Station?
H Wilson Sundt Generating Station is in Pima County, Arizona, at 32.1600, −110.9047. It is in the Tucson Electric Power Company balancing area (TEPC).
Who operates H Wilson Sundt Generating Station?
EIA-860M for August 2026 lists Tucson Electric Power Co as the operator (EIA operator ID 24211). The operator is not always the owner.
When did H Wilson Sundt Generating Station start operating?
Its first generator began operating in June 1962, 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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page