Separator (Etiwanda) BESS
Battery storage power plant · San Bernardino County, California
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Southern California Edison Co
- County
- San Bernardino County
- Generating units
- 1
- Share of state capacity
- 0.10%
- Rank among battery storage plants in California
- #28 of 142
- EIA plant code
- 65456
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| SEPAR | Batteries | 113 MW | 113 MW | 2024 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in California
| Daggett 1 | Battery storage | 114 MW |
| Marathon Bay Area Cogen | Natural gas | 114 MW |
| Valentine Solar, LLC | Solar | 111 MW |
| Big Creek 2A | Hydro | 110 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 113 MW solar plant and a 113 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All California power plants · What California actually generates