Flagtail BESS
BetaActiveBatteryERCOTLBNL
203.8 MW storage in Grimes, TX · In queue since April 2021 · Proposed COD July 2026
203.8 MW
Capacity
1
Components
Battery
4y 11m
In Queue
Facility Study
IA Status
COD target: 2026
Interconnection Timeline
Total Duration
5y 3m
Facilities Study50%
Queue EntryApr 5, 2021
Interconnection request submitted to ISO/RTO
Interconnection StudyCurrent
ERCOT uses a serial "connect and manage" approach — fastest among major ISOs.
Typical: 18–30 months (fastest major ISO)
Interconnection Agreement
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Commercial Operation
Proposed COD: 2026-07-01
Project Details
State
TX
County
Grimes
Region
ERCOT
Developer
Flagtail LLC
Utility
—
Entity
ERCOT
Point of Interconnection
Tap 138kV 5 Sandy Switch - 7 Sandy
Data Source
LBNL
No news available for this project.