Callisto I Energy Center — Plant Summary
- EIA Plant ID
- 66338
- Capacity
- 223.4 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Operating
- Location
- Harris, TX
- Operating Since
- 2024
- Generators
- 1
- Operator
- Callisto I Energy Center
- Parent Company
- —
- Annual Generation
- -23,521 MWh
- Capacity Factor
- -1.2%
- Balancing Authority
- Electric Reliability Council of Texas, Inc.
- ISO/RTO
- ERCOT
- NERC Region
- TRE
Callisto I Energy Center
OperatingBESS
Ranked #45 of 256 BESS plants in TX#131 of 837 nationally
223.4 MW BESS operating in Harris, TX — Electric Reliability Council of Texas, Inc.
EIA
223.4 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Location
Coordinates
29.6468, -95.4505
County
Harris, TX
Nearby Plants
- Friendswood EnergyNatural Gas121.5 MW · 0.1 km
- Callisto II Energy CenterBESS400 MW · 0.2 km
- HO Clarke GeneratingNatural Gas484 MW · 0.2 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Callisto I Energy Center | — | — |
| Owner(s) | Callisto I Energy Center | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
Callisto I Energy Center is a 223.4 MW battery energy storage system (BESS) located in Harris County, Texas. The facility, owned and operated by Callisto I Energy Center, went online in 2024. The plant utilizes lithium-ion (LIB) battery chemistry and has a total storage capacity of 200 MWh, providing approximately 0.9 hours of duration at full output. The primary fuel type is electricity (MWH) used to charge the batteries.
The Callisto I Energy Center operates within the Electric Reliability Council of Texas (ERCOT) balancing authority and the TRE NERC region. It is ranked as the 84th largest power plant in Texas out of 224 facilities, and nationally it holds the 242nd position out of 514 plants. The facility consists of a single generator.
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
Generation
−1.5K MWh
Net Charging
-23.5K MWh
Annual Net Energy
-1.2%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
Financial Data
No financial data available for this plant.
Pricing & Market Data
MEDIUM confidenceMarket Position
ISO/RTO Market
ERCOT
LMP Node
—
Pricing Hub
HB_HOUSTON
Node Source
Shared substation inference
HOCPRO01Nearby ISO Node
H.O. Clarke SubstationSubstation
News & Articles (6)Beta
Industry·technology
Why the Greater Houston Region is a Prime Location for Battery Energy Storage Projects
While BESS can provide the Houston region benefits, the Houston region also offers a lot to this growing energy solution.
Houston (other)
Greater Houston Partnership·1 years ago
Grid·capacity addition
Texas continues to break battery energy storage records
ERCOT approved six new batteries for commercial operations in September alone and Texas now has nearly 11 GWh of energy storage capacity.
ERCOT (regulator)
Power Engineering·1 years ago
Grid·capacity addition
Jupiter Power puts Houston’s first large-scale BESS into action in Texas’ ERCOT market
Jupiter Power has begun operating a BESS project in Houston which CEO Andy Bowman claimed is “the first of its scale” in the Texas city.
Jupiter Power (operator)Andy Bowman (executive)
Energy-Storage.News·1 years ago
Grid·capacity addition
Jupiter Power launches 400MWh battery storage in Houston, Texas
Jupiter Power has announced the commencement of commercial operations for its 400MWh dispatchable power facility in Houston, Texas.
Jupiter Power (operator)
Power Technology·1 years ago
Last updated 2026-03-26
View all 6 articles