Harlingen III BESS
110 MW storage in Cameron, TX · In queue since June 2023 · Proposed COD July 2027
110 MW
Capacity
1
Components
Battery
2y 11m
In Queue
Facility Study
IA Status
COD target: 2027
Total Duration
4y 1m
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: 2027-07-01
The Harlingen III BESS project is a proposed 110 MW battery storage project located in Cameron County, Texas. Developed by SMT Harlingen III LLC, the project entered the ERCOT interconnection queue as queue ID ERCOT-24INR0572 on June 28, 2023. The proposed commercial operation date is July 1, 2027, and its interconnection status is currently in the Facility Study phase.
The Harlingen III BESS project has been the subject of recent news coverage, with seven articles related to the project appearing in the news. These articles cover topics such as deals, grid infrastructure, and regulatory matters.
Generated from interconnection queue and public data sources
State
TX
County
Cameron
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
SMT Harlingen III LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
8320 WEST HARLINGEN 69kV
Data Source
LBNL + Live
- ISO / RTO
- ERCOT
- Trading Hub
- HB_SOUTH
- Hub Confidence
- MEDIUM
- Nearest Node (Estimated)
- W_HRL_ESR_RN
- POI Substation
- West Harlingen 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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