Mercer County, PA interconnection queue
4 interconnection applications are pending in Mercer County, PA, requesting 110 MW of new generating capacity, as of 15 August 2026. 0 projects have been built here and 52 have been withdrawn since 2015.
Source: interconnection queues published by PJM. 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 Mercer County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Solar | 4 | 110 MW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 0 | 0 MW | 0.0% |
| Still pending | 4 | 110 MW | 7.1% |
| Withdrawn | 52 | 1.9 GW | 92.9% |
| 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 |
|---|---|---|---|---|---|
| Shenango-McDowell 138 kV | Solar | 125 MW | withdrawn | 2020-09 | PJM |
| Shenango-McDowell 138kV | Solar | 120 MW | withdrawn | 2018-03 | PJM |
| Shenango 138 kV | Solar | 120 MW | withdrawn | 2019-03 | PJM |
| Maysville/Masury 138 kV | Solar | 100 MW | withdrawn | 2019-07 | PJM |
| Maysville 138 kV V | Solar | 100 MW | withdrawn | 2020-03 | PJM |
| McDowell 138 kV | Battery | 100 MW | withdrawn | 2022-03 | PJM |
| Maysville 138 kV IV | Solar | 80 MW | withdrawn | 2020-03 | PJM |
| Maysville 69 kV III | Battery | 70 MW | withdrawn | 2020-07 | PJM |
| Maysville 69 kV II | Solar | 68 MW | withdrawn | 2019-09 | PJM |
| Masury-Maysville 138 kV | Solar | 60 MW | withdrawn | 2020-03 | PJM |
| Maysville 138 kV III | Solar | 60 MW | withdrawn | 2020-03 | PJM |
| McDowell 138 kV | Solar | 55 MW | withdrawn | 2018-09 | PJM |
| Maysville 69 kV | Solar | 50 MW | active | 2019-03 | PJM |
| Maysville 69 kV IV | Battery | 50 MW | withdrawn | 2020-09 | PJM |
| Maysville 69 kV V | Battery | 50 MW | withdrawn | 2021-03 | PJM |
How this county ranks
Mercer County ranks #1075 of 1,607 US counties by capacity currently queued, and #17 of 62 in Pennsylvania.
Other Pennsylvania counties in the queue
| County | Pending | Capacity queued |
|---|---|---|
| York County | 6 | 2.9 GW |
| Clearfield County | 11 | 1.5 GW |
| Indiana County | 3 | 1.2 GW |
| Dauphin County | 3 | 896 MW |
| McKean County | 4 | 870 MW |
| Centre County | 5 | 591 MW |
| Fayette County | 4 | 310 MW |
| Crawford County | 6 | 248 MW |
Go deeper on Mercer 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 Mercer County on the map County reports All of Pennsylvania