Pluto Energy Storage
Battery storage power plant · Maricopa County, Arizona
Nameplate capacity
75 MW
Rank in Arizona
#100
of 205 plants
In service since
2025
July 2025
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Pluto Energy Storage, LLC
- County
- Maricopa County
- Generating units
- 1
- Share of state capacity
- 0.17%
- Rank among battery storage plants in Arizona
- #20 of 26
- EIA plant code
- 67328
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| PLUTO | Batteries | 75 MW | 75 MW | 2025 | 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
| Red Rock | Solar | 85 MW |
| Red Horse 2 | Solar | 81 MW |
| Foothills Solar Plant Hybrid | Solar | 73 MW |
| Gila Bend Hybrid | Solar | 68 MW |
About this data
From EIA’s inventory of operable generators, August 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 75 MW solar plant and a 75 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