Great Rock BESS
300.9 MW storage in Leon, TX · In queue since November 2022 · Proposed COD December 2027
300.9 MW
Capacity
1
Components
Battery
3y 6m
In Queue
IA Executed
IA Status
Signed Aug 2024
Queue → IA
1y 9m
IA → COD
3y 4m
Total Duration
1y 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 executed — binding commitment to build
Typical: 30–60 days (negotiation)
Project under construction
Typical: 6–18 months
Proposed COD: 2027-12-20
The Great Rock BESS project is a proposed 300.9 MW battery storage project located in Leon County, Texas. The developer is Black Mountain Energy Storage II. It is currently active in the ERCOT interconnection queue as entry ERCOT-25INR0230, with a queue entry date of November 7, 2022, and a proposed commercial operation date of December 20, 2027.
The project's interconnection agreement was executed on August 23, 2024. The point of interconnection is Tap 345kV 46020 Limestone - 967 Gibbon Creek Ckt 18.
Generated from interconnection queue and public data sources
State
TX
County
Leon
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Black Mountain Energy Storage II
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
Tap 345kV 46020 Limestone - 967 Gibbon Creek Ckt 18
Data Source
LBNL + Live
- ISO / RTO
- ERCOT
- Trading Hub
- HB_SOUTH
- Hub Confidence
- MEDIUM
- Nearest Node (Estimated)
- LEG_LEG_G1
- POI Substation
- Limestone Station
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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