Carambola BESS
97.43 MW storage in Hidalgo, TX · In queue since October 2022 · Proposed COD April 2026
97.43 MW
Capacity
1
Components
Battery
3y 7m
In Queue
IA Executed
IA Status
Signed Jul 2023
Queue → IA
9 months
IA → COD
2y 9m
Total Duration
9 months
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: 6–18 months
Proposed COD: 2026-04-20
The Carambola BESS project is a proposed 97.43 MW battery storage project located in Hidalgo County, Texas. The developer is SMT McAllen II LLC. It is interconnected within the ERCOT region under queue ID ERCOT-24INR0436, with an interconnection queue entry date of October 18, 2022, and a proposed commercial operation date of April 20, 2026. The project's Interconnection Agreement (IA) was executed on July 31, 2023.
The point of interconnection (POI) is the North Mcallen 138 kV Substation. The Carambola BESS project has been the subject of recent news coverage.
Generated from interconnection queue and public data sources
State
TX
County
Hidalgo
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
SMT McAllen II LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
North Mcallen 138 kV Substation (N_MCALLN, Bus#8368)
Data Source
LBNL + Live
- ISO / RTO
- ERCOT
- Trading Hub
- HB_SOUTH
- Hub Confidence
- MEDIUM
- POI Substation
- North 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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