Callisto II Energy Center — Plant Summary
- EIA Plant ID
- 68422
- Capacity
- 400 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Planned
- Location
- Harris, TX
- Operating Since
- —
- Generators
- 1
- Operator
- Callisto II Energy Center LLC
- Parent Company
- —
- Balancing Authority
- Electric Reliability Council of Texas, Inc.
- ISO/RTO
- ERCOT
- NERC Region
- TRE
Callisto II Energy Center
PlannedBESS
Ranked #16 of 256 BESS plants in TX#66 of 837 nationally
400 MW BESS planned in Harris, TX — Electric Reliability Council of Texas, Inc.
EIA
400 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
Planned: —
Planned Operation
Location
Coordinates
29.6453, -95.4502
County
Harris, TX
Nearby Plants
- HO Clarke GeneratingNatural Gas484 MW · 0.2 km
- Callisto I Energy CenterBESS223.4 MW · 0.2 km
- Friendswood EnergyNatural Gas121.5 MW · 0.3 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Callisto II Energy Center LLC | — | — |
| Owner(s) | Callisto II Energy Center LLC | — | — |
| Status | Planned | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
Callisto II Energy Center, located in Harris County, Texas, has a total capacity of 400 MW. The facility is owned and operated by Callisto II Energy Center LLC. The plant utilizes batteries as its primary technology and MWH as its fuel source. It has one generator.
The plant operates within the Electric Reliability Council of Texas, Inc. (ERCOT) balancing authority and the TRE NERC region. Callisto II Energy Center ranks as the 26th largest plant in Texas out of 224, and 90th nationally out of 514.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
TRE
Balancing Authority
Electric Reliability Council of Texas, Inc.
Grid Voltage
138 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Interconnection Queue1 projectBeta
Callisto II Energy Center
OperationalBattery406.06 MWERCOT
Generation
No generation data available for this plant.
Financial Data
No financial data available for this plant.
Pricing & Market Data
HIGH confidencePoint of Interconnection
Nearest Substation
H.O. Clarke Substation · 138 kV
Substation Distance
0.136 km
Operator
CenterPoint Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ERCOT
LMP Node
PRO_RN
Pricing Hub
HB_HOUSTON
Secondary Zone
LZ_HOUSTON
Location Type
Resource Node
Node Source
Curated node match
News & Articles (1)Beta
Grid·capacity addition
ERCOT clears 480MW of BESS for operations in August, including Tesla-owned unit at factory
The Electric Reliability Council of Texas (ERCOT) has cleared a further 480MW of battery storage capacity for commercial operations during the month of August.
ERCOT (regulator)Tesla (operator)
Energy-Storage.News·1 years ago
Last updated 2026-03-14
View all articles