Arroyo Storage
183.76 MW storage in Cameron, TX · In queue since May 2022 · Proposed COD April 2026
183.76 MW
Capacity
1
Components
Battery
4 years
In Queue
IA Executed
IA Status
Signed Aug 2022
Queue → IA
3 months
IA → COD
3y 8m
Total Duration
3 months
Schedule
1 months past proposed COD
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: 2026-04-14
The Arroyo Storage project is a proposed 183.76 MW battery energy storage system in Cameron County, Texas. The project, developed by BT Cantwell Solar, LLC, is currently in the ERCOT interconnection queue as entry ERCOT-24INR0306, with a queue entry date of May 10, 2022. The proposed commercial operation date is April 14, 2026.
The project's Interconnection Agreement (IA) has been executed as of August 10, 2022. The point of interconnection is Tap 345kV 8318 Rio Hondo - 8317 La Palma at the New Gulch Substation. The Arroyo Storage project has been the subject of recent news coverage.
Generated from interconnection queue and public data sources
State
TX
County
Cameron
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
BT Cantwell Solar, LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
Tap 345kV 8318 Rio Hondo - 8317 La Palma (New Gulch Substation )
Data Source
LBNL + Live
- ISO / RTO
- ERCOT
- Trading Hub
- HB_WEST
- Hub Confidence
- MEDIUM
- POI Substation
- Rio Hondo 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.
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