Sonoran Solar Energy
Maricopa County, Arizona · EIA plant ID 66627 · Operator: Sonoran Solar Energy, LLC
Nameplate750MWSummer 520 MW
Generators2in service
Net generation984GWh12 mo to Aug 2026
Capacity factor49%solar units, summer MW
Heat rate—thermal plants only
First online2023
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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) |
|---|---|---|---|
| 2023 | 90.9 | 56.9% | — |
| 2024 | 1,094 | 49.8% | — |
| 2025 | 1,077.1 | 49.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| SON12 | Solar Photovoltaic | PV | 490 | 260 | Dec 2023 | Operating | — | coming soon |
| SON13 | Batteries | BA | 260 | 260 | Jul 2023 | Operating | — | coming soon |
Owner / operator
Operator: Sonoran Solar Energy, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Sonoran Solar Energy, LLC | 100.0% | 750 MW |
Nearby plants
Within 80 km.
| Desert Star Hybrid | 20 MW | 15.9 km |
| Justice Energy Storage | 150 MW | 18.2 km |
| Buckeye Union HS District 201 | 3 MW | 19.2 km |
| Macys Goodyear | 3 MW | 21.4 km |
| Pluto Energy Storage | 75 MW | 21.6 km |
| Sun Streams 4 | 600 MW | 25.4 km |