Overnight SolarUnder construction
San Bernardino County, California · EIA plant ID 68932 · Operator: Overnight Solar LLC
300 MW under construction (Batteries, Solar Photovoltaic), first expected Jan 2027 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 300 MW building
Net generation—GWh12 mo
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online—
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
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 |
|---|---|---|---|---|---|---|---|---|
| OSBA | Batteries | BA | 150 | 150 | planned Jan 2027 | Under construction | — | coming soon |
| OSPV | Solar Photovoltaic | PV | 150 | 150 | planned Jan 2027 | Under construction | — | coming soon |
Owner / operator
Operator: Overnight Solar LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Nearby plants
Within 80 km.
| SEGS VIII | 169 MW | 1.6 km |
| Mojave Solar Project | 280 MW | 1.6 km |
| Lockhart ESS, LLC | 45 MW | 1.8 km |
| Lockhart Solar PV IV, LLC | 80 MW | 2.5 km |
| SEGS IX | retired | 2.5 km |
| Desert Breeze Solar, LLC | 125 MW | 2.6 km |