Sierra Estrella Energy Storage
Battery storage power plant · Maricopa County, Arizona
Nameplate capacity
250 MW
Rank in Arizona
#47
of 200 plants
In service since
2024
May 2024
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Sierra Estrella Energy Storage, LLC
- County
- Maricopa County
- Generating units
- 1
- Share of state capacity
- 0.58%
- Rank among battery storage plants in Arizona
- #8 of 35
- EIA plant code
- 66334
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| BESS3 | Batteries | 250 MW | 250 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 Arizona
| Beehive Energy Storage | Battery storage | 250 MW |
| Pediment BESS I | Battery storage | 250 MW |
| Chevelon Butte Wind Farm | Wind | 238 MW |
| Chevelon Butte Phase 2 | Wind | 216 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 250 MW solar plant and a 250 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 Arizona power plants · What Arizona actually generates