TSS 971 Prairie 345 kV
200 MW storage in McHenry, IL · In queue since April 2026 · Proposed COD December 2031
200 MW
Capacity
0
Components
6 months
In Queue
—
IA Status
COD target: 2031
One connected view of the asset's ownership, operating or development evidence, grid context, commercial relationships, history, and forward outlook.
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Total Duration
5y 8m
Study Phase
C01
Interconnection request submitted to ISO/RTO
PJM processes interconnection requests through multi-phase System Impact Studies (SIS).
Typical: ~48 months (historically longest)
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2031-12-31
TSS 971 Prairie 345 kV is a proposed 200 MW battery energy storage development project located in McHenry County, Illinois. The project is being developed by Pleasant Grove BESS, LLC and would connect to the transmission system of ComEd, the local utility. Its proposed point of interconnection is the TSS 971 Prairie 345 kV substation, from which the project takes its name.
The project is listed in the PJM Interconnection queue under queue ID PJM-C01-1857 and holds an active status. It entered the queue on April 24, 2026, as a generation interconnection request, and is currently in the C01 study phase of PJM's interconnection process. The developer has proposed a commercial operation date of December 31, 2031.
Generated from interconnection queue and public data sources
Realization risk before commercial operation — cluster-study clearance, IA timing, counterparty mix, and withdrawal probability vs cohort. The diligence view that determines whether this project is worth pursuing. Powered by InfraSure's development-stage modeling stack.
See the full development-risk decomposition for this project.
State
IL
County
McHenry
Grid Region
PJM Interconnection
Market
ISO/RTO Member
Developer
Pleasant Grove BESS, LLC
Utility
ComEd
Entity
PJM
Service Type
Generation Interconnection
Point of Interconnection
TSS 971 Prairie 345 kV
Data Source
live-pjm_cycle
Composite operating-phase risk view — what this asset's risk profile would look like once it reaches commercial operation. 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 — what this project would produce assuming it reaches commercial operation. Probabilistic ranges (P10/P50/P90) across weather, demand, and policy scenarios, conditioned on the proposed COD. 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. The bankability view that determines whether the deal clears its covenants once online. Powered by InfraSure's asset cashflow stack.
See the full revenue + DSCR projection for this project.
- ISO / RTO
- PJM
- Trading Hub
- N ILLINOIS HUB
- Hub Confidence
- MEDIUM
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 TSS 971 Prairie 345 kVForward forecasts, scenario decomposition, and risk-decision tooling for this queue project.
