Big River BESS
BetaActiveBatteryERCOTLBNL + Live
51.26 MW storage in Zapata, TX · In queue since May 2021 · Proposed COD December 2028
51.26 MW
Capacity
1
Components
Battery
4y 10m
In Queue
Facility Study
IA Status
COD target: 2028
Interconnection Timeline
Total Duration
7y 7m
Facilities Study50%
Queue EntryMay 4, 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: 2028-12-31
Project Details
State
TX
County
Zapata
Region
ERCOT
Developer
Rio Grande River Solar LLC
Utility
—
Entity
ERCOT
Point of Interconnection
tap 138kV 8299 Zapata - 8957 Lopeno4A
Data Source
LBNL + Live