St. Clair County, IL interconnection queue
3 interconnection applications are pending in St. Clair County, IL, requesting 495 MW of new generating capacity, as of 15 August 2026. 1 projects have been built here and 7 have been withdrawn since 2019.
Source: interconnection queues published by MISO. Parsed and normalised by Watt Street. Data as of 15 August 2026. A queued project is a request, not a commitment.
What is waiting in St. Clair County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Solar | 2 | 350 MW |
| Hybrid | 1 | 145 MW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 1 | 150 MW | 9.1% |
| Still pending | 3 | 495 MW | 27.3% |
| Withdrawn | 7 | 1.5 GW | 63.6% |
| Suspended | 0 | — | 0.0% |
Withdrawal is the ordinary outcome of an interconnection application nationally, not a sign of a problem in this county. Most withdrawals are a developer testing a site and moving on.
The largest projects on file
| Project | Fuel | Capacity | Status | Filed | Queue |
|---|---|---|---|---|---|
| 7ASTER - 7CMDR 345.0kV | Hybrid | 500 MW | withdrawn | 2022-09 | MISO |
| Turkey Hill 345kV | Solar | 250 MW | withdrawn | 2022-09 | MISO |
| Fayetteville Bee Hollow Road 138kV Substation | Solar | 200 MW | active | 2022-09 | MISO |
| DUPO FERRY | Solar | 200 MW | withdrawn | 2021-10 | MISO |
| 4PREST - 4BALDWIN 138.0kV | Solar | 199 MW | withdrawn | 2022-09 | MISO |
| Herzog | Solar | 150 MW | withdrawn | 2024-04 | MISO |
| Fayetteville Bee Hollow Road 138 kV Substation | Solar | 150 MW | completed | 2019-04 | MISO |
| Fayetteville Bee Hollow Road | Solar | 150 MW | active | 2025-01 | MISO |
| Turkey Hill 138 kV | Hybrid | 145 MW | active | 2022-09 | MISO |
| Prairie State Plant Switchyard 345 kV | Solar | 100 MW | withdrawn | 2022-09 | MISO |
| Tap on line Fayetteville 138kV (endpoint A) to HERZOG 138kV (endpoint B) | Solar | 70 MW | withdrawn | 2022-09 | MISO |
How this county ranks
St. Clair County ranks #627 of 1,607 US counties by capacity currently queued, and #45 of 64 in Illinois.
Other Illinois counties in the queue
| County | Pending | Capacity queued |
|---|---|---|
| Lee County | 12 | 6.4 GW |
| Will County | 5 | 4.3 GW |
| McLean County | 11 | 2.9 GW |
| Ogle County | 5 | 2.9 GW |
| LaSalle County | 7 | 2.8 GW |
| Christian County | 8 | 2.3 GW |
| Peoria County | 7 | 2.1 GW |
| Tazewell County | 10 | 1.9 GW |
Go deeper on St. Clair County
The interactive map plots every one of these applications, and a generated county report puts them in a sourced PDF with the date each figure was true on every page.
Open St. Clair County on the map County reports All of Illinois