Marshall Spring Storage
150 MW storage in Gillespie, TX · In queue since February 2023 · Proposed COD July 2026
150 MW
Capacity
1
Components
Battery
3y 3m
In Queue
Facility Study
IA Status
COD target: 2026
Total Duration
3y 5m
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: 2026-07-01
Marshall Spring Storage is a proposed 150 MW battery storage project located in Gillespie County, Texas. Developed by Marshall Springs Storage, LLC, the project consists entirely of battery storage. It is currently in the ERCOT interconnection queue as entry ERCOT-25INR0354, with a queue entry date of February 20, 2023. The proposed commercial operation date is July 1, 2026, and the project's interconnection agreement status is currently in the Facility Study phase.
The point of interconnection (POI) is planned at a new station between the 7132 L_GILLES8_1Y - 7126 L_FERGUS8_1Y 138kV line and the 7132 L_GILLES8_1Y - 7128 L_HORSBA8_1Y 138kV line, looping both lines into the new POI station. The development project has been mentioned in recent news coverage.
Generated from interconnection queue and public data sources
State
TX
County
Gillespie
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Marshall Springs Storage, LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
New POI station between 7132 L_GILLES8_1Y - 7126 L_FERGUS8_1Y 138kV line and 7132 L_GILLES8_1Y - 7128 L_HORSBA8_1Y 138kV line, then loop in both lines into the new POI station.
Data Source
LBNL + Live
- 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.
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