Sienna 2 Solar and Storage ProjectPlanned
San Bernardino County, California · EIA plant ID 68486 · Operator: 44ST 8ME LLC
110 MW planned (Batteries, Solar Photovoltaic), first expected Mar 2029 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service
Net generation—GWh12 mo
Capacity factor—no 923 generation in the last 12 months
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 |
|---|---|---|---|---|---|---|---|---|
| 44STA | Solar Photovoltaic | PV | 55 | 55 | planned Mar 2029 | Planned | — | coming soon |
| 44STB | Batteries | BA | 55 | 55 | planned Mar 2029 | Planned | — | coming soon |
Owner / operator
Operator: 44ST 8ME 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.
| Sienna Solar Farm | — | 2.7 km |
| Lone Valley Solar Park II LLC | 20 MW | 11.2 km |
| Lone Valley Solar Park I LLC | 10 MW | 12.3 km |
| Longboat Solar, LLC | 20 MW | 16.1 km |
| Powhatan Solar Power Generation Station 1 LLC | 2 MW | 23.4 km |
| Foundation Cemex BMQ | 3 MW | 24.1 km |