Callisto 1C Energy Center
103.8 MW storage in Harris, TX · In queue since September 2024 · Proposed COD July 2026
103.8 MW
Capacity
1
Components
Battery
1y 8m
In Queue
Facility Study
IA Status
COD target: 2026
Total Duration
1y 10m
Interconnection request submitted to ISO/RTO
ERCOT uses a serial "connect and manage" approach — fastest among major ISOs.
Typical: 18–30 months (fastest major ISO)
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2026-07-20
The Callisto 1C Energy Center is a proposed 103.8 MW battery storage project located in Harris County, Texas. Developed by Tempus Power Management LLC, the project is interconnected within the Electric Reliability Council of Texas (ERCOT) region. It entered the ERCOT interconnection queue as project number ERCOT-28INR0154 on September 10, 2024, with a proposed commercial operation date of July 20, 2026. The project's interconnection status is currently in the Facility Study phase.
The proposed project consists of 103.8 MW of battery storage capacity. Recent news coverage has discussed the development.
Generated from interconnection queue and public data sources
State
TX
County
Harris
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Tempus Power management LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
#47150 HOC 138kV
Data Source
LBNL + Live
- ISO / RTO
- ERCOT
- Trading Hub
- HB_NORTH
- Hub Confidence
- LOW
This project's market context is estimated from its Point of Interconnection. Hub and node assignments are approximate and based on geographic inference from the POI substation name.
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