Diamond Cowboy Storage
103.5 MW storage in San Patricio, TX · In queue since April 2024 · Proposed COD October 2028
103.5 MW
Capacity
1
Components
Battery
2y 1m
In Queue
Facility Study
IA Status
COD target: 2028
Total Duration
4y 6m
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: 2028-10-16
Diamond Cowboy Storage is a proposed 103.5 MW battery storage project in San Patricio County, Texas. Developed by Diamond B Storage, LLC, the project is located within the ERCOT region and entered the ERCOT interconnection queue as entry 26INR0428 on April 15, 2024. The current interconnection status is listed as Facility Study, with a proposed commercial operation date of October 16, 2028.
The proposed project consists entirely of battery storage, with a total capacity of 103.5 MW. The point of interconnection is the Tap 345kV 8249 Angstrom - 8624 Grissom. The project has appeared in recent news coverage.
Generated from interconnection queue and public data sources
State
TX
County
San Patricio
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Diamond B Storage, LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
Tap 345kV 8249 Angstrom - 8624 Grissom
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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