Stonewall BESS
135 MW hybrid in Stonewall, TX · In queue since February 2025 · Proposed COD December 2028
135 MW
Capacity
0
Components
1y 3m
In Queue
—
IA Status
COD target: 2028
Total Duration
3y 10m
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: 2028-12-29
The Stonewall BESS project is a proposed 135 MW hybrid battery energy storage system located in Stonewall County, Texas. Developed by Stonewall ESS, LLC, the project is interconnected within the ERCOT region under queue ID ERCOT-28INR0253. It entered the interconnection queue on February 25, 2025, with a proposed commercial operation date of December 29, 2028.
The proposed project is linked to the existing Stonewall BESS operating plant (EIA ID 68666).
Generated from interconnection queue and public data sources
State
TX
County
Stonewall
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Stonewall ESS, LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
tap 138kV 6150 SPUR4A - 6158 ASPM4A
Data Source
Live · ERCOT
- ISO / RTO
- ERCOT
- Trading Hub
- HB_WEST
- Hub Confidence
- LOW
- POI Substation
- Peacock 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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