Prairie Fire
Pima County, Arizona · EIA plant ID 58171 · Operator: Tucson Electric Power Co
Nameplate5MWSummer 5 MW
Generators1in service
Net generation8GWh12 mo to Dec 2025
Capacity factor20%solar units, summer MW
Heat rate—thermal plants only
First online2012
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), solar 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2012 | 0 | 1.3% | — |
| 2013 | 8.4 | 19.3% | — |
| 2014 | 9.1 | 23.0% | — |
| 2015 | 8.6 | 21.9% | — |
| 2016 | 8.9 | 22.5% | — |
| 2017 | 9 | 22.8% | — |
| 2018 | 8.2 | 20.9% | — |
| 2019 | 7.1 | 17.9% | — |
| 2020 | 9 | 22.9% | — |
| 2021 | 8.8 | 22.2% | — |
| 2022 | 8.3 | 20.9% | — |
| 2023 | 7.5 | 19.1% | — |
| 2024 | 7.8 | 19.8% | — |
| 2025 | 7.7 | 19.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Solar Photovoltaic | PV | 4.5 | 4.5 | Dec 2012 | Operating | — | 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% | 5 MW |
Nearby plants
Within 80 km.
| FRB Solar Farm | 2 MW | 1 km |
| Gato Montes Solar, LLC | 5 MW | 1.5 km |
| Cogenra - TEP | 1 MW | 1.7 km |
| Iron Horse Battery Storage Hybrid | 12 MW | 2 km |
| Tech Park Solar | 5 MW | 2.1 km |
| Amazon TUS2 | 3 MW | 2.3 km |