Mason County, IL interconnection queue
5 interconnection applications are pending in Mason County, IL, requesting 1.0 GW of new generating capacity, as of 15 August 2026. 3 projects have been built here and 10 have been withdrawn since 2010.
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 Mason County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Wind | 2 | 400 MW |
| Hybrid | 2 | 322 MW |
| Solar | 1 | 320 MW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 3 | 391 MW | 16.7% |
| Still pending | 5 | 1.0 GW | 27.8% |
| Withdrawn | 10 | 1.3 GW | 55.6% |
| 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 |
|---|---|---|---|---|---|
| 4PURO - 4HAVANA3 138.0kV | Solar | 320 MW | active | 2022-09 | MISO |
| Powerton 345kV | Wind | 208 MW | withdrawn | 2010-08 | PJM |
| Indian Creek | Solar | 200 MW | withdrawn | 2024-04 | MISO |
| Puro | Wind | 200 MW | active | 2022-09 | MISO |
| Mason 138kV | Solar | 200 MW | withdrawn | 2022-09 | MISO |
| Winnebago | Wind | 200 MW | withdrawn | 2024-04 | MISO |
| Quiver | Wind | 200 MW | active | 2024-04 | MISO |
| Havana - Shockey 138 kV Line Tap | Wind | 188 MW | completed | 2019-04 | MISO |
| 4HAVANA2 - 4CINCINATTI 138.0kV | Hybrid | 180 MW | active | 2022-09 | MISO |
| Havana-Shockey (138kV) | Hybrid | 150 MW | withdrawn | 2022-09 | MISO |
| Mason Substation 138 kV Bus | Wind | 144 MW | completed | 2018-03 | MISO |
| Cane | Hybrid | 142 MW | active | 2022-09 | MISO |
| Quiver | Solar | 136 MW | withdrawn | 2025-05 | MISO |
| Mason 138 kV Substation | Wind | 58 MW | completed | 2019-04 | MISO |
| Cane 138 kV | Solar | 52 MW | withdrawn | 2022-09 | MISO |
How this county ranks
Mason County ranks #361 of 1,607 US counties by capacity currently queued, and #18 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 Mason 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.