HOLBROOK
SubstationMassachusetts · TOWN OF MIDDLEBOROUGH - (MA)
HOLBROOK is an electric transmission substation in Massachusetts, operated by TOWN OF MIDDLEBOROUGH - (MA). It is classified as high-voltage (345 kv) and connects 11 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 & operation
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #4500 | 345 kV | — | IN SERVICE | 5.7 mi |
| #47574 | 345 kV | TOWN OF MIDDLEBOROUGH - (MA) | IN SERVICE | 7.4 mi |
| #7244 | 115 kV | — | IN SERVICE | 5.0 mi |
| #19295 | 115 kV | — | IN SERVICE | 2.4 mi |
| #2088 | 115 kV | — | IN SERVICE | 1.8 mi |
| #31297 | 115 kV | — | IN SERVICE | 2.4 mi |
| #31353 | 115 kV | TOWN OF MIDDLEBOROUGH - (MA) | IN SERVICE | 7.4 mi |
| #35089 | 115 kV | — | IN SERVICE | 1.3 mi |
| #36319 | 115 kV | — | IN SERVICE | 5.0 mi |
| #28942 | 115 kV | — | IN SERVICE | 1.2 mi |
| #2937 | 115 kV | — | IN SERVICE | 5.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of HOLBROOK, 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 |
|---|---|---|---|---|---|---|---|
| ANP BELLINGHAM ENERGY PROJECT | Substation-Adjacent | MA | Norfolk County | 345 kV | 600 MW | 3.5 yrs | 72.9 |
| KINGSTON STREET | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 3.5 yrs | 72.2 |
| K STREET | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 3.5 yrs | 71.1 |
| WALTHAM | Substation-Adjacent | MA | Middlesex County | 230 kV | 300 MW | 3.5 yrs | 70.9 |
| NORTH CAMBRIDGE | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 3.5 yrs | 70.6 |
| GOLDEN HILLS | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 3.5 yrs | 70.4 |
| MYSTIC | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 3.5 yrs | 70.1 |
| WAKEFIELD JUNCTION | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 3.5 yrs | 69.5 |
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
This page shows a public slice of the GridCensus dataset for HOLBROOK substation, Massachusetts. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.