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528.9 MW Natural Gas Fired Combustion Turbine (54 MW) + Natural Gas Internal Combustion Engine (188 MW) + Natural Gas Steam Turbine (287 MW) operating in Pima, AZ — Tucson Electric Power Company
528.9 MW
Nameplate Capacity
14
Generators
units
Hybrid (3)
Technology
Natural Gas Fired Combustion Turbine + Natural Gas Internal Combustion Engine + Natural Gas Steam Turbine
1962
Operating Since
Coordinates
32.1600, -110.9047
County
Pima, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Tucson Electric Power Co | Tucson Electric Power | — |
| Owner(s) | Tucson Electric Power Co | Fortis | — |
| Status | Operating | — | — |
The H Wilson Sundt Generating Station is a 528.9 MW natural gas-fired power plant located in Pima County, Arizona. Operated by Tucson Electric Power Co., a subsidiary of the Canadian company Fortis, the plant began operations in 1962 and consists of 14 generators utilizing a combination of natural gas-fired combustion turbine, internal combustion engine, and steam turbine technologies. It is considered a hybrid plant.
In the most recent year of data, the plant generated 1,833,089 MWh of electricity, achieving a capacity factor of 43.1%. The H Wilson Sundt Generating Station operates within the Tucson Electric Power Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. It is ranked as the 21st largest power plant in Arizona out of 26, and 468th nationally out of 945 plants.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Tucson Electric Power Company (TEPC)
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
195.6K MWh
Latest Month
1.8M MWh
Annual Generation
43.1%
Capacity Factor
CO₂ Intensity
760 lb/MWh
NOx
1 lb/MWh
SO₂
0.022 lb/MWh
CH₄
0.023 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
30.0%
Annual Net Gen
1391 GWh
CO₂eq
761 lb/MWh
Subregion
WECC Southwest
2013
$965/kW
Est. Construction Cost
Total estimated cost: $510.4M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-04-09
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