Walstrom BESS
205.31 MW storage in Austin, TX · In queue since July 2021 · Proposed COD June 2025
205.31 MW
Capacity
1
Components
Battery
4y 10m
In Queue
IA Executed
IA Status
Signed Jun 2023
Queue → IA
1y 11m
IA → COD
2 years
Total Duration
1y 11m
Schedule
11 months past proposed COD
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: 2025-06-19
The Walstrom BESS project is a proposed 205.31 MW battery storage project located in Austin County, Texas. Developed by Sealy Power LLC, the project consists entirely of battery storage. It is currently active in the ERCOT interconnection queue as entry ERCOT-22INR0540, with a queue entry date of July 8, 2021, and a proposed commercial operation date of June 19, 2025.
The project's Interconnection Agreement (IA) was executed on June 30, 2023. The point of interconnection (POI) is the 46220 Peters 138kV location. The Walstrom BESS project is linked to the existing Sealy BESS operating plant (EIA ID 69045). The project has also appeared in recent news coverage.
Generated from interconnection queue and public data sources
State
TX
County
Austin
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Sealy Power LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
46220 Peters 138kV
Data Source
LBNL
- ISO / RTO
- ERCOT
- Trading Hub
- HB_HOUSTON
- Hub Confidence
- HIGH
- Nearest Node (Estimated)
- WAL_RN
- POI Substation
- Peters 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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