Bottom Grass BESS II
150.6 MW storage in Colorado, TX · In queue since November 2022 · Proposed COD December 2026
150.6 MW
Capacity
1
Components
Battery
3y 6m
In Queue
Facility Study
IA Status
COD target: 2026
Total Duration
4y 1m
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: 2026-12-01
The Bottom Grass BESS II project is a proposed 150.6 MW battery storage project located in Colorado County, Texas. The developer is Flint Rock Solar Project, LLC. It is currently active in the ERCOT interconnection queue as entry ERCOT-25INR0153, with a queue entry date of November 7, 2022, and a proposed commercial operation date of December 1, 2026.
The project's interconnection status is currently in the Facility Study phase. The point of interconnection is Tap 345kV 9073 Holman - 44200 Hillje. The project has appeared in recent news.
Generated from interconnection queue and public data sources
State
TX
County
Colorado
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Flint Rock Solar Project, LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
Tap 345kV 9073 Holman - 44200 Hillje
Data Source
LBNL
- ISO / RTO
- ERCOT
- Trading Hub
- HB_SOUTH
- Hub Confidence
- MEDIUM
- POI Substation
- Holman 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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