Data centers and new power in Middlesex County, MA
1.2 GW of new power is waiting to connect to the grid in Middlesex County, MA — 4 active requests. Typical wait: 4.8 years. 8 projects are built, 47 withdrawn. Data as of 14 October 2026.
Is one near your house?
We have not mapped a large AI data center inside Middlesex County itself — but we track the biggest ones nationally, and requests to connect new power here are on the public record.
What is happening with electricity in Middlesex County
Every new power plant, battery or big customer has to join a waiting list before it can plug into the grid. This is what that list looks like in Middlesex County right now.
Where every request ever filed here ended up
Most requests in the US are withdrawn — a developer tests a site and moves on. That is normal, not a warning sign for Middlesex County.
What kind of power is asking to connect
By capacity requested. Data as of 14 October 2026.
All the numbers
59 requests ever filed
Source: interconnection queues published by ISONE. Parsed and normalised by Watt Street. Data as of 14 October 2026. A queued project is a request, not a commitment.
Outcome of every request filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 8 | 404 MW | 13.6% |
| Still waiting | 4 | 1.2 GW | 6.8% |
| Withdrawn | 47 | 11.2 GW | 79.7% |
| Paused | 0 | — | 0.0% |
Waiting to connect, by type of power
| Type | Projects | Capacity requested |
|---|---|---|
| Batteries | 3 | 1.2 GW |
| Nuclear | 1 | 12 MW |
Key dates for projects here
1 dated · next closes 2026-11-19 (ISONE)
| Queue | What closes | Closes | Standing |
|---|---|---|---|
| ISONE | ISO-NE cluster request window Cluster study under OATT Schedules 22, 23 and 25. | 2026-11-19 | disputed source |
| FERC | FERC large-load show cause — stakeholder comments on RTO responses Comments on the six RTO/ISO responses to the FPA section 206 show-cause orders of 18 June 2026 (PJM EL26-67, SPP EL26-68, NYISO EL26-69, MISO EL26-70… | No date published yet | unconfirmed source |
| FERC | FERC RM26-4 — generic large-load rulemaking Still at ANOPR stage. | No date published yet | confirmed source |
| FERC | Georgia PSC - Georgia Power must file large-load contracts 30 days before execution A standing obligation rather than a dated one: large-load contracts must be filed with the commission at least 30 days before they are executed. | No date published yet | confirmed source |
A date marked confirmed was checked by a person against the authority's own tariff, order or form page. Anything else is listed so you know it exists, with a link so you can check it yourself. Full calendar.
The biggest projects on file
top 15 by size
| Project | Type | Capacity | Status | Filed | Queue |
|---|---|---|---|---|---|
| CNR Increase | Natural 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 | Batteries | 508 MW | active | 2021-06 | ISONE |
| Battery Storage | Batteries | 500 MW | active | 2024-06 | ISONE |
| Battery Storage | Batteries | 500 MW | withdrawn | 2020-08 | ISONE |
| Billerica Power | Wind | 311 MW | withdrawn | 2006-06 | ISONE |
| Kendall Revised Reconfiguration Project | Natural gas | 250 MW | completed | 2015-10 | ISONE |
| Gas Turbine | Natural gas | 208 MW | withdrawn | 2013-02 | ISONE |
| Battery Storage | Batteries | 204 MW | withdrawn | 2020-10 | ISONE |
| Norman Street Battery Storage | Batteries | 204 MW | active | 2021-03 | ISONE |
How Middlesex County compares
#311 in the US · #2 in MA
Middlesex County ranks #311 of 1,607 US counties by power waiting to connect, and #2 of 12 in Massachusetts.
| County | Waiting | 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 |
Common questions about power in Middlesex County
How long does it take to get power for a data center in Middlesex County, MA?
The median wait for a project still in the interconnection queue in Middlesex County is 4.8 years. Across the US, most large loads are quoted three to seven years depending on the market and whether network upgrades are needed. 8 projects in Middlesex County have reached energization and 47 were withdrawn, so the withdrawal rate here is a better guide to risk than any single quoted timeline.
How much capacity is available in Middlesex County, MA?
1.2 GW is currently requested across 4 active interconnection requests, and 404 MW has actually been built. A queued megawatt is a request, not deliverable capacity — most queued projects are never built. For deliverable offtake capacity at a specific substation you need a utility study, not a queue.
Is Middlesex County, MA a good site for a data center?
This page gives you the power half of that answer: what is queued, what has been energized, how long the wait runs, and which large load interconnection requests are already recorded nearby. The other half — the state policy position, moratoriums and large load tariffs — is on our Massachusetts policy page.
Where does the data on this page come from?
The interconnection queue published by the transmission providers serving Middlesex County — ISONE — parsed and normalised by Watt Street. Every figure carries the date it was true. Data as of 14 October 2026.
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