UASTP I
Pima County, Arizona · EIA plant ID 57392 · Operator: Tucson Electric Power Co
Nameplate1MWSummer 2 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor16%solar units, summer MW
Heat rate—thermal plants only
First online2010
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) |
|---|---|---|---|
| 2010 | 0.1 | 5.8% | — |
| 2011 | 0.3 | 3.2% | — |
| 2012 | 3 | 28.8% | — |
| 2013 | 3.1 | 29.4% | — |
| 2014 | 2.8 | 26.5% | — |
| 2015 | 2.6 | 24.3% | — |
| 2016 | 1.4 | 13.3% | — |
| 2017 | 2.8 | 26.8% | — |
| 2018 | 3 | 28.5% | — |
| 2019 | 2.2 | 21.0% | — |
| 2020 | 2.6 | 24.5% | — |
| 2021 | 1.5 | 14.6% | — |
| 2022 | 0.3 | 2.4% | — |
| 2023 | 0.4 | 3.1% | — |
| 2024 | 1.6 | 12.1% | — |
| 2025 | 2.1 | 16.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| UATP1 | Solar Photovoltaic | PV | 1.2 | 1.5 | Dec 2010 | 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% | 1 MW |
Nearby plants
Within 80 km.
| Tech Park Solar | 5 MW | 0.5 km |
| Cogenra - TEP | 1 MW | 0.6 km |
| Iron Horse Battery Storage Hybrid | 12 MW | 0.8 km |
| Gato Montes Solar, LLC | 5 MW | 1.1 km |
| FRB Solar Farm | 2 MW | 1.8 km |
| Prairie Fire | 5 MW | 2.3 km |