Callisto II Energy Center
203.2 MW storage in Harris, TX · In queue since October 2021 · Proposed COD July 2026
203.2 MW
Capacity
1
Components
Battery
4y 9m
In Queue
IA Executed
IA Phase
Signed Dec 2023
Queue → IA
2y 2m
IA → COD
2y 7m
Total Duration
2y 2m
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 executed — binding commitment to build
Typical: 30–60 days (negotiation)
Project under construction
Typical: 6–18 months
Proposed COD: 2026-07-20
The Callisto II Energy Center is a proposed 406.06 MW battery storage project located in Harris County, Texas. The project, developed by Callisto II Energy Center LLC, is interconnected within the ERCOT region under queue ID ERCOT-22INR0558. It entered the queue on October 7, 2021, with a proposed commercial operation date of July 20, 2026. The project's interconnection agreement was executed on December 11, 2023.
The proposed project is linked to the existing Callisto II Energy Center operating plant (EIA ID 68422). Recent news coverage indicates the project has been discussed in the context of grid development.
Generated from interconnection queue and public data sources
Realization risk from now to commercial operation — financing close, EPC and tax-equity counterparty mix, and COD probability vs the proposed date. The diligence view that determines whether the deal actually closes. Powered by InfraSure's development-stage modeling stack.
See the full development-risk decomposition for this project.
State
TX
County
Harris
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Callisto II Energy Center LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
47150 HO Clarke 138kV
Data Source
LBNL + Live
Composite operating-phase risk view — what this asset's risk profile will look like once it commissions. Climate hazards across its operating life, expected generation variability, and offtake counterparty exposure, decomposed into a single decision-grade score. Powered by InfraRisk.
See the full risk decomposition + scenarios for this project.
Forward generation outlook — first-year production estimate and 10-year P50 trajectory, with probabilistic ranges (P10/P50/P90) across weather, demand, and policy scenarios. Powered by InfraSure's generation modeling stack.
See the full forecast + scenario decomposition for this project.
Forward revenue, DSCR projection, and financing-close risk — conditioned on commercial operation. First-year DSCR, 10-year cashflow, and counterparty exposure across price and policy scenarios. Powered by InfraSure's asset cashflow stack.
See the full revenue + DSCR projection for this project.
- ISO / RTO
- ERCOT
- Trading Hub
- HB_HOUSTON
- Hub Confidence
- HIGH
- Nearest Node (Estimated)
- PRO_RN
- POI Substation
- H.O. Clarke Substation
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.
Forward forecasts, scenario decomposition, and risk-decision tooling for this queue project.
