Diamante BESS
513.68 MW storage in Grimes, TX · In queue since February 2024 · Proposed COD November 2028
513.68 MW
Capacity
1
Components
Battery
2y 3m
In Queue
Facility Study
IA Status
COD target: 2028
Total Duration
4y 9m
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: 2028-11-01
The Diamante BESS project is a proposed 513.68 MW battery storage project located in Grimes County, Texas. Developed by Flexen USA LLC, the project is currently active in the ERCOT interconnection queue as entry ERCOT-27INR0115, with a queue entry date of February 27, 2024. The proposed commercial operation date is November 1, 2028, and the project's interconnection agreement status is currently in the Facility Study phase.
The Diamante BESS project consists entirely of battery storage, with a total capacity of 513.68 MW. The point of interconnection is the 40600 ROANS__POI_5 345kV location. The project has appeared in recent news coverage regarding energy storage developments in Texas.
Generated from interconnection queue and public data sources
State
TX
County
Grimes
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Flexen USA LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
40600 ROANS__POI_5 345kV
Data Source
LBNL
- 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.
