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
Last updated 2026-03-26
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