Middlesex County, MA interconnection queue
5 interconnection applications are pending in Middlesex County, MA, requesting 1.3 GW of new generating capacity, as of 15 August 2026. 8 projects have been built here and 46 have been withdrawn since 1997.
Source: interconnection queues published by ISONE. 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 Middlesex County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Battery | 4 | 1.3 GW |
| Nuclear | 1 | 12 MW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 8 | 404 MW | 13.6% |
| Still pending | 5 | 1.3 GW | 8.5% |
| Withdrawn | 46 | 11.0 GW | 78.0% |
| 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 |
|---|---|---|---|---|---|
| CNR Increase | Gas | 1.6 GW | withdrawn | 2014-08 | ISONE |
| AC to HVDC Tie | Nuclear | 1.2 GW | withdrawn | 2015-02 | ISONE |
| 1200 MW HVDC Line (controllable) Into Mystic | Nuclear | 1.2 GW | withdrawn | 2019-04 | ISONE |
| 1200 MW controllable ETU - unidirectional | Nuclear | 1.2 GW | withdrawn | 2023-06 | ISONE |
| HVDC Line | Nuclear | 1.1 GW | withdrawn | 2015-02 | ISONE |
| HVDC from S. Maine to Mystic - bidirectional flow | Nuclear | 1.0 GW | withdrawn | 2015-02 | ISONE |
| HVDC Tie NB to Mystic | Nuclear | 900 MW | withdrawn | 2015-12 | ISONE |
| Battery Storage | Battery | 508 MW | active | 2021-06 | ISONE |
| Battery Storage | Battery | 500 MW | active | 2024-06 | ISONE |
| Battery Storage | Battery | 500 MW | withdrawn | 2020-08 | ISONE |
| Billerica Power | Wind | 311 MW | withdrawn | 2006-06 | ISONE |
| Kendall Revised Reconfiguration Project | Gas | 250 MW | completed | 2015-10 | ISONE |
| Gas Turbine | Gas | 208 MW | withdrawn | 2013-02 | ISONE |
| Battery Storage | Battery | 204 MW | withdrawn | 2020-10 | ISONE |
| Norman Street Battery Storage | Battery | 204 MW | active | 2021-03 | ISONE |
How this county ranks
Middlesex County ranks #286 of 1,607 US counties by capacity currently queued, and #2 of 12 in Massachusetts.
Other Massachusetts counties in the queue
| County | Pending | Capacity queued |
|---|---|---|
| Bristol County | 2 | 1.4 GW |
| Suffolk County | 2 | 550 MW |
| Barnstable County | 1 | 500 MW |
| Norfolk County | 2 | 470 MW |
| Berkshire County | 2 | 426 MW |
| Essex County | 2 | 425 MW |
| Worcester County | 2 | 384 MW |
| Hampden County | 2 | 295 MW |
Go deeper on Middlesex 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 Middlesex County on the map County reports All of Massachusetts