TAP135409
SubstationMassachusetts · NSTAR ELECTRIC COMPANY
At a glance
TAP135409 is an electric transmission substation in Massachusetts, on NSTAR ELECTRIC COMPANY's transmission network. It is classified as sub-transmission (115 kv) and connects 3 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Ownership
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #135505 | 115 kV | NSTAR ELECTRIC COMPANY | IN SERVICE | 0.2 mi |
| #139518 | 115 kV | NSTAR ELECTRIC COMPANY | IN SERVICE | 4.2 mi |
| #165784 | 115 kV | NSTAR ELECTRIC COMPANY | IN SERVICE | 0.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP135409, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| AUBURN STREET | Substation-Adjacent | MA | Norfolk County | 345 kV | 600 MW | 4.3 yrs | 66.5 |
| BRIDGEWATER | Substation-Adjacent | MA | Plymouth County | 345 kV | 600 MW | 4.3 yrs | 65.6 |
| CARVER | Substation-Adjacent | MA | Plymouth County | 345 kV | 600 MW | 4.3 yrs | 63.8 |
| FALL RIVER | Substation-Adjacent | MA | Bristol County | 345 kV | 600 MW | 4.3 yrs | 63.7 |
| UNKNOWN133428 | Substation-Adjacent | MA | Plymouth County | 345 kV | 600 MW | 4.3 yrs | 63.6 |
| UNKNOWN133429 | Substation-Adjacent | MA | Plymouth County | 345 kV | 600 MW | 4.3 yrs | 63.6 |
| UNKNOWN133427 | Substation-Adjacent | MA | Plymouth County | 345 kV | 600 MW | 4.3 yrs | 63.4 |
| CANAL | Substation-Adjacent | MA | Barnstable County | 345 kV | 600 MW | 4.3 yrs | 63.1 |
Who owns the transmission lines at TAP135409?
The 3 connected lines listed above are owned by NSTAR ELECTRIC COMPANY. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 4.5 miles.
How do candidate sites near TAP135409 score?
The 8 highest-scoring candidate sites within about 25 miles range from 63 to 67 on the 0–100 DC Readiness scale. They fall in Norfolk County, Plymouth County, Bristol County, Barnstable County. The Massachusetts average across 1,861 scored sites is 54.2. 305 of those Massachusetts sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is TAP135409 substation?
TAP135409 has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so TAP135409 is at the national midpoint.
How many transmission lines connect to TAP135409 substation?
3 transmission lines terminate at or pass through TAP135409 in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 4.5 miles.
Who owns TAP135409 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP135409 belong to NSTAR ELECTRIC COMPANY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP135409 substation located?
TAP135409 is in Massachusetts at 41.6938, -70.8819. The datacenter candidate sites closest to it are in Norfolk County, Plymouth County, Bristol County.
Are there datacenter candidate sites near TAP135409 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP135409. The highest-scoring is AUBURN STREET at 67/100. Across Massachusetts, the average DC Readiness score is 54.2.
More in Massachusetts
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “TAP135409 substation, Massachusetts”, https://gridcensus.com/substations/massachusetts/tap135409-d946f371 (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
Go deeper than the public screen
Every site and score for TAP135409 substation, Massachusetts is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.