Sigma Storage
408.4 MW storage in Harris, TX · In queue since May 2021 · Proposed COD October 2029
408.4 MW
Capacity
1
Components
Battery
5 years
In Queue
Facility Study
IA Status
COD target: 2029
Total Duration
8y 5m
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: 2029-10-01
The Sigma Storage project is a proposed 408.4 MW battery storage project located in Harris County, Texas. Developed by AES Distributed Energy, Inc., the project is currently active in the ERCOT interconnection queue as entry ERCOT-23INR0126, with a queue entry date of May 11, 2021. The proposed commercial operation date is October 1, 2029, and the project's interconnection agreement status is currently in the Facility Study phase.
The Sigma Storage project consists entirely of battery storage with a total capacity of 408.4 MW. The point of interconnection is the 40460 Deepwater 138kV. The project has been mentioned in recent news coverage, with three articles categorized as deals and industry news.
Generated from interconnection queue and public data sources
State
TX
County
Harris
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
AES Distributed Energy, Inc
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
40460 Deepwater 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.
