United States › Power plants › Battery storage › Texas
BATTERY STORAGECallisto II Energy Center
Callisto II Energy Center is a 400 MW under construction battery storage site in Harris County, Texas, operated by Callisto II Energy Center LLC.
Plant statusUnder construction
- Planning (completed)
- Consented (completed)
- Construction (current stage)
- OperatingTarget Nov 2026 (not yet reached)
- Closed (not yet reached)
Planned start of operation reported to EIA: Nov 2026.
Generators
Each generating unit EIA lists at this plant.
| Unit | Technology | Capacity | Status |
|---|---|---|---|
| CALII | Batteries | 400 MW | Under construction (over 50%) |
Plant details
- Operator
- Callisto II Energy Center LLC
- Location
- Harris County, Texas
- Balancing authority
- ERCO
- Sector
- IPP Non-CHP
- Capacity
- Under construction: 400 MW
- EIA plant ID
- 68422
Location
29.6453, -95.4503
Nearby power plants
- Pamela Heights I Energy CenterBattery storage · 100 MW · 0.0 mi
- HO Clarke GeneratingGas power plants · 484 MW · 0.1 mi
- Callisto I Energy CenterBattery storage · 223 MW · 0.1 mi
- Friendswood EnergyGas power plants · 265 MW · 0.2 mi
- OTHERTraditionBuffaloGas power plants · 1.2 MW · 3.0 mi
- Telview ESSBattery storage · 10.0 MW · 5.1 mi
- TECO CHP-1Gas power plants · 98.0 MW · 5.1 mi
- WAL3584Gas power plants · 1.2 MW · 5.5 mi
- SouthwickOil-fired power plants · 9.0 MW · 6.1 mi
- Rice UniversityGas power plants · 6.9 MW · 6.2 mi
Source: U.S. Energy Information Administration, Form EIA-860M, September 2026. Planned dates are targets reported by the developer and often change. Report a problem