ROCKY HILL
SubstationMassachusetts · FITCHBURG GAS AND ELECTRIC LIGHT COMPANY
At a glance
ROCKY HILL is an electric transmission substation in Massachusetts, operated by FITCHBURG GAS AND ELECTRIC LIGHT COMPANY. It is classified as sub-transmission (115 kv) and connects 2 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #125954 | 115 kV | FITCHBURG GAS AND ELECTRIC LIGHT COMPANY | IN SERVICE | 0.1 mi |
| #143872 | 115 kV | FITCHBURG GAS AND ELECTRIC LIGHT COMPANY | IN SERVICE | 0.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of ROCKY HILL, 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 |
|---|---|---|---|---|---|---|---|
| NORTH CAMBRIDGE | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 4.3 yrs | 68.1 |
| WEST FARNUM | Substation-Adjacent | RI | Providence County | 345 kV | 600 MW | 4.3 yrs | 67.2 |
| LEXINGTON | Substation-Adjacent | MA | Middlesex County | 345 kV | 600 MW | 4.3 yrs | 67.0 |
| WOBURN | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 4.3 yrs | 66.9 |
| HYDE PARK | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 4.3 yrs | 66.9 |
| WALTHAM | Substation-Adjacent | MA | Middlesex County | 230 kV | 300 MW | 4.3 yrs | 66.3 |
| STOUGHTON | Substation-Adjacent | MA | Norfolk County | 345 kV | 600 MW | 4.3 yrs | 66.2 |
| WEST WALPOLE | Substation-Adjacent | MA | Norfolk County | 345 kV | 600 MW | 4.3 yrs | 66.1 |
How does ROCKY HILL compare with other substations in Massachusetts?
Massachusetts has 612 substation records in HIFLD, of which 229 carry a station name; the rest are unnamed tap points, risers and line ends. 144 named substations in the state are in ROCKY HILL's 115–229 kV band (63% of named stations). 39 sit in a higher band. 31 named substations in Massachusetts operate at 345 kV or above. The highest voltage recorded in the state is 345 kV, and the state median is 115 kV.
Who owns the transmission lines at ROCKY HILL?
The 2 connected lines listed above are owned by FITCHBURG GAS AND ELECTRIC LIGHT COMPANY. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 0.1 miles.
How do candidate sites near ROCKY HILL score?
The 8 highest-scoring candidate sites within about 25 miles range from 66 to 68 on the 0–100 DC Readiness scale. They fall in Suffolk County, Providence County, Middlesex County, Norfolk 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 ROCKY HILL substation?
ROCKY HILL 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 ROCKY HILL is at the national midpoint.
How many transmission lines connect to ROCKY HILL substation?
2 transmission lines terminate at or pass through ROCKY HILL in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 0.1 miles.
Who owns ROCKY HILL substation?
HIFLD lists FITCHBURG GAS AND ELECTRIC LIGHT COMPANY as the operator of ROCKY HILL.
Where is ROCKY HILL substation located?
ROCKY HILL is in Massachusetts at 42.1575, -71.4884. The datacenter candidate sites closest to it are in Suffolk County, Providence County, Middlesex County.
Are there datacenter candidate sites near ROCKY HILL substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of ROCKY HILL. The highest-scoring is NORTH CAMBRIDGE at 68/100. Across Massachusetts, the average DC Readiness score is 54.2.
Other 115 kV substations in Massachusetts
- MILLBURY NO.2· 13 lines
- SOMERSET· 10 lines
- DOREEN· 8 lines
- BAKER STREET· 7 lines
- BRIGHTON· 7 lines
- FITCHBURG· 7 lines
- AYER· 6 lines
- BLACKSTONE JUNCTION· 6 lines
- All named substations in Massachusetts· 229 stations
- Datacenter candidate sites in Massachusetts· 1,861 sites
- Brownfield and retired plant sites in Massachusetts
- Substations by state
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, “ROCKY HILL substation, Massachusetts”, https://gridcensus.com/substations/massachusetts/rocky-hill-8c455386 (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 ROCKY HILL 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.