Marshall Spring Storage
150 MW generation in Gillespie, TX · In queue since February 2023 · Proposed COD July 2026
150 MW
Capacity
1
Components
Battery
3y 5m
In Queue
Facility Study
IA Phase
Signed Dec 2025
Queue → IA
2y 10m
IA → COD
7 months
Total Duration
2y 10m
Schedule
0 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: 18–30 months
Proposed COD: 2026-07-01
Gillespie County commissioners passed resolution opposing BESS projects including Peregrine's facility
sourceGillespie County filed petition to intervene in lawsuit over safety and water concerns
sourceLBNL reports IA date of 2025-12-26 with Facility Study status
sourceMarshall 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
Realization risk before commercial operation — cluster-study clearance, IA timing, counterparty mix, and withdrawal probability vs cohort. The diligence view that determines whether this project is worth pursuing. Powered by InfraSure's development-stage modeling stack.
See the full development-risk decomposition for this project.
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
Composite operating-phase risk view — what this asset's risk profile would look like once it reaches commercial operation. Climate hazards across its operating life, expected generation variability, and offtake counterparty exposure, decomposed into a single decision-grade score. Powered by InfraRisk.
See the full risk decomposition + scenarios for this project.
Forward generation outlook — what this project would produce assuming it reaches commercial operation. Probabilistic ranges (P10/P50/P90) across weather, demand, and policy scenarios, conditioned on the proposed COD. Powered by InfraSure's generation modeling stack.
See the full forecast + scenario decomposition for this project.
Forward revenue, DSCR projection, and financing-close risk — conditioned on commercial operation. The bankability view that determines whether the deal clears its covenants once online. Powered by InfraSure's asset cashflow stack.
See the full revenue + DSCR projection for this project.
- 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.
Last updated 2026-04-09
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