Maricopa Solar
Maricopa County, Arizona · EIA plant ID 69684 · Operator: Maricopa Solar
550 MW under construction (Batteries), first expected Dec 2026 · EIA-860M
Nameplate550MWSummer 550 MW
Generators1in service · 550 MW building
Net generation93GWh12 mo to Aug 2026
Capacity factor11%solar units, summer MW
Heat rate—thermal plants only
First online2026
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.
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 |
|---|---|---|---|---|---|---|---|---|
| 70124 | Solar Photovoltaic | PV | 550 | 550 | Jul 2026 | Operating | — | coming soon |
| 70125 | Batteries | BA | 550 | 550 | planned Dec 2026 | Under construction | — | coming soon |
Owner / operator
Operator: Maricopa Solar. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Maricopa Solar | 100.0% | 550 MW |
Nearby plants
Within 80 km.
| Harquahala 2 | 600 MW | 0.3 km |
| Harquahala Generating Project | 1,277 MW | 1.5 km |
| Harquahala Sun Solar Project | 150 MW | 3.4 km |
| Desert Sand BESS | — | 6.6 km |
| Papago PV | 150 MW | 6.8 km |
| Papago Energy Storage | 300 MW | 7.1 km |