Duffy BESS
235.9 MW storage in Matagorda, TX · In queue since August 2023 · Proposed COD December 2026
235.9 MW
Capacity
1
Components
Battery
2y 9m
In Queue
Facility Study
IA Status
COD target: 2026
Total Duration
3y 4m
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: 2026-12-31
The Duffy BESS project is a proposed 235.9 MW battery storage project located in Matagorda County, Texas. Developed by Duffy Energy Storage LLC, the project consists entirely of battery storage. It is currently active in the ERCOT interconnection queue as entry ERCOT-26INR0250, with a queue entry date of August 21, 2023. The proposed commercial operation date is December 31, 2026, and the project's interconnection agreement status is currently in the Facility Study phase.
The Duffy BESS project has been the subject of recent news coverage, with 29 articles related to the project appearing in the news, primarily focusing on deals and development.
Generated from interconnection queue and public data sources
State
TX
County
Matagorda
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Duffy Energy Storage LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
Tap 345kV WAP to STP CKT39 (PTI# 5915-44000 CKT 39)
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.
Last updated 2026-04-09
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