Serrano Storage
185.59 MW storage in Maverick, TX · In queue since September 2023 · Proposed COD December 2026
185.59 MW
Capacity
1
Components
Battery
2y 8m
In Queue
Facility Study
IA Status
COD target: 2026
Total Duration
3y 3m
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: 2026-12-01
Serrano Storage is a proposed 185.59 MW battery storage project located in Maverick County, Texas. The project, developed by Maverick ESS, LLC, is currently active in the ERCOT interconnection queue as entry ERCOT-24INR0617, with a queue entry date of September 23, 2023. The proposed commercial operation date is December 1, 2026, and the project's interconnection agreement status is currently in the Facility Study phase.
The Serrano Storage project has been the subject of recent news coverage, with three articles detailing development and deal activity. The point of interconnection is the 8267 GANSO Substation at 138kV.
Generated from interconnection queue and public data sources
State
TX
County
Maverick
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Maverick ESS, LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
8267 GANSO Substation 138kV
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.
Last updated 2026-03-26
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