Mercedes II BESS
227.87 MW storage in Hidalgo, TX · In queue since May 2023 · Proposed COD October 2025
227.87 MW
Capacity
1
Components
Battery
3 years
In Queue
Facility Study
IA Status
COD target: 2025
Total Duration
2y 5m
Schedule
7 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 not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2025-10-09
The Mercedes II BESS project is a proposed 227.87 MW battery storage project located in Hidalgo County, Texas. The developer is SMT Mercedes II, LLC. The project is interconnected within the ERCOT region and entered the ERCOT interconnection queue as queue ID ERCOT-24INR0550 on May 15, 2023. The proposed commercial operation date is October 9, 2025, and the project's interconnection agreement status is currently in the Facility Study phase.
The point of interconnection for the Mercedes II BESS project is at the TAP NORTH MERCEDES (BUS #8358) and NORTH WESLACO (BUS# 8357) substations. The project has appeared in 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 Mercedes II, LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
TAP NORTH MERCEDES (BUS #8358) and NORTH WESLACO (BUS# 8357)
Data Source
LBNL
- ISO / RTO
- ERCOT
- Trading Hub
- HB_NORTH
- Hub Confidence
- LOW
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.
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