Demoss Petrie — Plant Summary
- EIA Plant ID
- 124
- Capacity
- 85 MW
- Primary Fuel
- Natural Gas
- Technology
- Natural Gas Fired Combustion Turbine
- Status
- Operating
- Location
- Pima, AZ
- Operating Since
- 2001
- Generators
- 1
- Operator
- Tucson Electric Power Co
- Parent Company
- Fortis
- Annual Generation
- 2,469 MWh
- Capacity Factor
- 0.3%
- Balancing Authority
- Tucson Electric Power Company
- ISO/RTO
- —
- NERC Region
- WECC
Demoss Petrie
OperatingNatural Gas
Ranked #28 of 33 Natural Gas plants in AZ#994 of 2009 nationally
85 MW Natural Gas operating in Pima, AZ — Tucson Electric Power Company
EIAWD
85 MW
Nameplate Capacity
1
Generators
unit
Natural Gas Fired Combustion Turbine
Technology
2001
Operating Since
Location
Coordinates
32.2522, -110.9921
County
Pima, AZ
Nearby Plants
- Pima Energy Storage SystemBESS10 MW · 0.1 km
- Amphitheater High School SolarSolar1 MW · 2.6 km
- Cogeneration 2Natural Gas5.5 MW · 4.3 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Tucson Electric Power Co | Tucson Electric Power | — |
| Owner(s) | Tucson Electric Power Co | Fortis | — |
| Status | Operating | — | — |
Ownership Chain
About
Demoss Petrie is an 85 MW natural gas-fired power plant located in Pima County, Arizona. The plant began operating in 2001 and has one generator utilizing natural gas-fired combustion turbine technology. It is owned by Fortis, a Canadian company, and operated by Tucson Electric Power Co. The plant's balancing authority is Tucson Electric Power Company, and it falls within the WECC NERC region. Demoss Petrie ranks as the 27th largest power plant out of 31 in Arizona, and 987th out of 1963 nationally.
In the latest year with available data, Demoss Petrie generated 2,469 MWh of electricity, resulting in a capacity factor of 0.3%. Financial data indicates an installed cost of $398.97 per kW, according to FERC filings.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Tucson Electric Power Company
Grid Voltage
138 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Generation
208 MWh
Latest Month
2.5K MWh
Annual Generation
0.3%
Capacity Factor
Jan 2022 – Dec 2024
Financial DataBeta
Source: FERC Form 1HIGH
$416/kW
Installed Cost
$104.7/MWh
Operating Cost
Tucson Electric Power Company
Reporting Utility
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
Regulatory·state puc
Controversial transmission line in Tucson gets green light from regulators
The Arizona Corporation Commission allowed Tucson Electric Power to build a new overhead transmission line and substation near downtown.
Arizona Corporation Commission (regulator)Tucson Electric Power (other)
azcentral.com and The Arizona Republic·1 years ago
General
Tucson Electric Power to build another big battery system to meet peak power demand
Tucson Electric Power plans to build a second, large battery system in southeast Tucson to store solar and other energy until later in the day to meet peak...
Arizona Daily Star·1 years ago
Industry·corporate
Collection: Read more on Tucson Electric Power's proposed power line
Local residents can hear an update and comment on a high-voltage power line Tucson Electric Power proposes to build through much of central Tucson,...
Tucson Electric Power (other)
Arizona Daily Star·2 years ago
Industry·corporate
Tucson Electric overhead power line plan runs afoul of neighbors, city
Historic Tucson neighborhoods opposed to overhead lines and the city want the Kino-DeMoss Petrie line put underground, but TEP says it's too...
Tucson Electric Power (other)
Arizona Daily Star·4 years ago
Last updated 2026-03-26
View all 10 articles