Foothills Solar Plant Hybrid
Yuma County, Arizona · EIA plant ID 57997 · Operator: Arizona Public Service Co
Nameplate73MWSummer 73 MW
Generators3in service
Net generation80GWh12 mo to Dec 2025
Capacity factor26%solar units, summer MW
Heat rate—thermal plants only
First online2013
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) |
|---|---|---|---|
| 2013 | 61.1 | 44.2% | — |
| 2014 | 80.7 | 26.3% | — |
| 2015 | 110.8 | 36.1% | — |
| 2016 | 96.9 | 31.5% | — |
| 2017 | 95.6 | 31.2% | — |
| 2018 | 93 | 30.3% | — |
| 2019 | 95.5 | 31.1% | — |
| 2020 | 97.8 | 31.8% | — |
| 2021 | 104.3 | 34.0% | — |
| 2022 | 96.9 | 31.6% | — |
| 2023 | 101.5 | 33.1% | — |
| 2024 | 97.8 | 31.1% | — |
| 2025 | 80.2 | 25.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| FH38M | Batteries | BA | 35 | 35 | Apr 2023 | Operating | — | coming soon |
| PV1 | Solar Photovoltaic | PV | 18 | 18 | Mar 2013 | Operating | — | coming soon |
| PV2 | Solar Photovoltaic | PV | 20 | 20 | Dec 2013 | Operating | — | coming soon |
Owner / operator
Operator: Arizona Public Service Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Arizona Public Service Co | 100.0% | 73 MW |
Nearby plants
Within 80 km.
| Yuma Solar + Storage | 140 MW | 0.7 km |
| Arizona Western College PV | 5 MW | 7.7 km |
| ORCHARD Solar Generation and BESS | — | 19.3 km |
| Yuma Cogeneration Associates | 63 MW | 22.9 km |
| Siphon Drop Power Plant | 4 MW | 24.1 km |
| Yucca | 422 MW | 27.6 km |