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
7 years
In Queue
IA Executed
IA Phase
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
Realization risk from now to commercial operation — financing close, EPC and tax-equity counterparty mix, and COD probability vs the proposed date. The diligence view that determines whether the deal actually closes. Powered by InfraSure's development-stage modeling stack.
See the full development-risk decomposition for this project.
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
Composite operating-phase risk view — what this asset's risk profile will look like once it commissions. Climate hazards across its operating life, expected generation variability, and offtake counterparty exposure, decomposed into a single decision-grade score. Powered by InfraRisk.
See the full risk decomposition + scenarios for this project.
Forward generation outlook — first-year production estimate and 10-year P50 trajectory, with probabilistic ranges (P10/P50/P90) across weather, demand, and policy scenarios. Powered by InfraSure's generation modeling stack.
See the full forecast + scenario decomposition for this project.
Forward revenue, DSCR projection, and financing-close risk — conditioned on commercial operation. First-year DSCR, 10-year cashflow, and counterparty exposure across price and policy scenarios. Powered by InfraSure's asset cashflow stack.
See the full revenue + DSCR projection for this project.
- 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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Ask about Grandslam SolarForward forecasts, scenario decomposition, and risk-decision tooling for this queue project.
