Callisto I Energy Center
Battery storage power plant · Harris County, Texas
Nameplate capacity
223 MW
Rank in Texas
#266
of 1,071 plants
In service since
2024
August 2024
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Callisto I Energy Center
- County
- Harris County
- Generating units
- 1
- Share of state capacity
- 0.11%
- Rank among battery storage plants in Texas
- #13 of 211
- EIA plant code
- 66338
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| CALL1 | Batteries | 223 MW | 200 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 Texas
| ENGIE Long Draw Solar LLC | Solar | 225 MW |
| Red Gate Power Plant | Natural gas | 224 MW |
| Ganado Solar | Solar | 221 MW |
| Cranell Wind Farm LLC | Wind | 220 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 223 MW solar plant and a 223 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 Texas power plants · What Texas actually generates