Demoss Petrie
Pima County, Arizona · EIA plant ID 124 · Operator: Tucson Electric Power Co
Nameplate85MWSummer 75 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor0%gas/coal/oil units, summer MW
Heat rate13,820Btu/kWhfossil units, electric fuel, HHV
First online2001Runs as rarely runs
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2002 | 53.3 | — | — |
| 2003 | 35.2 | 5.6% | 14,990 |
| 2004 | 23.1 | 3.6% | 16,310 |
| 2005 | 18.8 | 3.0% | 17,359 |
| 2006 | 16.6 | 2.6% | 14,567 |
| 2007 | 17.9 | 2.8% | 14,496 |
| 2008 | 10.1 | 1.6% | 13,814 |
| 2009 | 4.1 | 0.6% | 15,087 |
| 2010 | 6.6 | 1.0% | 14,557 |
| 2011 | 3.1 | 0.5% | 17,739 |
| 2012 | 5.5 | 0.9% | 16,390 |
| 2013 | 7 | 1.1% | 14,232 |
| 2014 | 5.6 | 0.9% | 15,338 |
| 2015 | 4.6 | 0.7% | 14,913 |
| 2016 | 5.3 | 0.8% | — |
| 2017 | 9.4 | 1.4% | — |
| 2018 | 5.2 | 0.8% | 16,564 |
| 2019 | 16.3 | 2.5% | 14,134 |
| 2020 | 1.3 | 0.2% | 17,355 |
| 2021 | 0.7 | 0.1% | 21,580 |
| 2022 | 0.8 | 0.1% | 16,023 |
| 2023 | 1.3 | 0.2% | 14,125 |
| 2024 | 2.5 | 0.4% | 13,763 |
| 2025 | 2.1 | 0.3% | 13,820 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GT2 | Natural Gas Fired Combustion Turbine | GT | 85 | 75 | Jun 2001 | Operating | — | coming soon |
| BA1 | Batteries | BA | 10 | 10 | planned Jan 2017 | not_current | — | coming soon |
Owner / operator
Operator: Tucson Electric Power Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Tucson Electric Power Co | 100.0% | 85 MW |
Nearby plants
Within 80 km.
| Pima Energy Storage System | 10 MW | 0.1 km |
| Amphitheater High School Solar | 1 MW | 2.5 km |
| Cogeneration 2 | 6 MW | 4.3 km |
| Cogeneration 1 | 9 MW | 4.5 km |
| Roger Road WWTP | 1 MW | 5.6 km |
| Pima Community College NW | 1 MW | 10.7 km |