223.4 MW BESS operating in Harris, TX — Electric Reliability Council of Texas, Inc.
223.4 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Coordinates
29.6468, -95.4505
County
Harris, TX
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Callisto I Energy Center | — | — |
| Owner(s) | Callisto I Energy Center | — | — |
| Status | Operating | — | — |
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
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
−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.
No financial data available for this plant.
Market Position
ISO/RTO Market
ERCOT
LMP Node
—
Pricing Hub
HB_HOUSTON
Node Source
Shared substation inference
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.
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.
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 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.
Last updated 2026-03-26
View all 6 articles