Big River BESS
51.26 MW storage in Zapata, TX · In queue since May 2021 · Proposed COD December 2028
51.26 MW
Capacity
1
Components
Battery
5 years
In Queue
Facility Study
IA Status
COD target: 2028
Total Duration
7y 7m
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: 2028-12-31
Big River BESS is a proposed 51.26 MW battery storage project in Zapata County, Texas. The project, being developed by Rio Grande River Solar LLC, is interconnected within the ERCOT region under queue ID ERCOT-23INR0237. It entered the interconnection queue on May 4, 2021, and has a proposed commercial operation date of December 31, 2028. The project's interconnection status is currently in the Facility Study phase.
The Big River BESS development has been the subject of recent news coverage.
Generated from interconnection queue and public data sources
State
TX
County
Zapata
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Rio Grande River Solar LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
tap 138kV 8299 Zapata - 8957 Lopeno4A
Data Source
LBNL + Live
- ISO / RTO
- ERCOT
- Trading Hub
- HB_SOUTH
- Hub Confidence
- MEDIUM
- Nearest Node (Estimated)
- BRP_ZPT1_RN
- POI Substation
- Zapata Substation
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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