Grandslam Solar
121.89 MW generation in Atascosa, TX · In queue since July 2019 · Proposed COD November 2026
121.89 MW
Capacity
1
Components
Solar
6y 10m
In Queue
IA Executed
IA Status
Signed Jan 2021
Queue → IA
1y 6m
IA → COD
5y 10m
Total Duration
1y 6m
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: 12–24 months
Proposed COD: 2026-11-28
Grandslam Solar is a proposed 121.89 MW solar generation project located in Atascosa County, Texas. The project, developed by Grandslam Solar, L.L.C., is interconnected within the ERCOT region. It entered the ERCOT interconnection queue as project ERCOT-21INR0391 on July 29, 2019, with a proposed commercial operation date of November 28, 2026.
The project's Interconnection Agreement (IA) was executed on January 29, 2021, and its current status is listed as active. The point of interconnection (POI) is the 5700 Miracle Lake 138kV substation. The project has appeared in recent news coverage.
Generated from interconnection queue and public data sources
State
TX
County
Atascosa
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Grandslam Solar, L.L.C.
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
5700 Miracle Lake 138kV
Data Source
LBNL + Live
- 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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