Electric Substations in Connecticut
154 named substations in Connecticut, with the highest-voltage facilities listed first. Each substation profile shows voltage class, connected transmission lines, and the datacenter candidate sites closest to it.
At a glance
How is Connecticut's substation network split by voltage?
By maximum voltage, the named substations break down as 20 at 345–499 kV; 121 at 115–229 kV; 13 withvoltage not recorded. 13% of Connecticut's named substations operate at 345 kV or above, against 8% across all 16,654 named US substations. The state median of 115 kV is level with the national median of 115 kV.
How does Connecticut compare with other states?
Connecticut ranks 31st of 50 states and DC by number of named substations and 24th by named substations at 345 kV or above. It also has 919 scored datacenter candidate sites with an average DC Readiness score of 56.7 (national average 53), and an average power sub-score of 35.5 against 37.4 nationally. Most of those sites (917) are in the ISO-NE market.
Which substations in Connecticut have the highest voltage?
| Substation | Max voltage | Connected lines | Line owner |
|---|---|---|---|
| BARBOUR HILL | 345 kV | 7 | CONNECTICUT LIGHT & POWER CO |
| BRIDGEPORT HARBOR | 345 kV | 6 | — |
| BRIDGEPORT RESCO | 345 kV | 4 | — |
| CARD` | 345 kV | 9 | CONNECTICUT LIGHT & POWER CO |
| FROST BRIDGE | 345 kV | 10 | CONNECTICUT LIGHT & POWER CO |
| HADDAM | 345 kV | 7 | CONNECTICUT LIGHT & POWER CO |
| HADDAM NECK | 345 kV | 3 | CONNECTICUT LIGHT & POWER CO |
| KILLINGLY | 345 kV | 6 | CONNECTICUT LIGHT & POWER CO |
| KLEEN | 345 kV | 3 | CONNECTICUT LIGHT & POWER CO |
| LAKE ROAD | 345 kV | 4 | CONNECTICUT LIGHT & POWER CO |
| LONG MOUNTAIN | 345 kV | 4 | CONNECTICUT LIGHT & POWER CO |
| MANCHESTER | 345 kV | 10 | CONNECTICUT LIGHT & POWER CO |
| MILLSTONE | 345 kV | 10 | CONNECTICUT LIGHT & POWER CO |
| MONTVILLE | 345 kV | 13 | CONNECTICUT LIGHT & POWER CO |
| NEW HAVEN HARBOR | 345 kV | 7 | CONNECTICUT LIGHT & POWER CO |
| NO. WALL | 345 kV | 4 | CONNECTICUT LIGHT & POWER CO |
| NORTH BLOOMFIELD | 345 kV | 9 | CONNECTICUT LIGHT & POWER CO |
| PLUMTREE | 345 kV | 6 | CONNECTICUT LIGHT & POWER CO |
| SCOVILL ROCK | 345 kV | 5 | CONNECTICUT LIGHT & POWER CO |
| SOUTHINGTON | 345 kV | 14 | CONNECTICUT LIGHT & POWER CO |
| ALLINGS CROSSING | 115 kV | 4 | — |
| ANSONIA | 115 kV | 2 | — |
| ASH CREEK | 115 kV | 2 | — |
| BALDWIN | 115 kV | 3 | — |
| BATES ROCK | 115 kV | 2 | — |
| BEACON FALLS | 115 kV | 2 | — |
| BEAN HILL | 115 kV | 2 | — |
| BERLIN | 115 kV | 6 | CONNECTICUT LIGHT & POWER CO |
| BLACK ROCK | 115 kV | 3 | CONNECTICUT LIGHT & POWER CO |
| BLOOMFIELD | 115 kV | 3 | CONNECTICUT LIGHT & POWER CO |
| BOKUM | 115 kV | 5 | CONNECTICUT LIGHT & POWER CO |
| BRANDFORD | 115 kV | 4 | CONNECTICUT LIGHT & POWER CO |
| BRANDFORD RR | 115 kV | 2 | — |
| BRIDGEPORT ENERGY | 115 kV | 4 | — |
| BRISTOL | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| BROOKLYN | 115 kV | 1 | CONNECTICUT LIGHT & POWER CO |
| BUDDINGTON | 115 kV | 3 | — |
| BULLS BRIDGE | 115 kV | 1 | CONNECTICUT LIGHT & POWER CO |
| BUNKER HILL | 115 kV | 4 | CONNECTICUT LIGHT & POWER CO |
| C.H. DEXTER | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| CAMPVILLE | 115 kV | 5 | CONNECTICUT LIGHT & POWER CO |
| CANAL ST | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| CANTON | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| CARMEL HILL | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| CHIPPEN HILL | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| COMPO | 115 kV | 2 | — |
| CONGRESS ST | 115 kV | 4 | — |
| COS COB | 115 kV | 3 | — |
| DARIEN | 115 kV | 2 | — |
| DERBY | 115 kV | 4 | — |
| DEVON | 115 kV | 13 | — |
| DOOLEY | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| DUDLEY | 115 kV | 1 | — |
| EAST DEVON | 115 kV | 4 | — |
| EAST HARTFORD | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| EAST MERIDEN | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| EAST NEW BRITAIN | 115 kV | 2 | CONNECTICUT LIGHT & POWER CO |
| ELM WEST | 115 kV | 1 | — |
| ELMWEST | 115 kV | 4 | — |
| FALLS VILLAGE | 115 kV | 4 | CONNECTICUT LIGHT & POWER CO |
Every named substation in Connecticut
All 154 named substations, grouped by voltage band.
345–499 kV · 20
115–229 kV · 121
- ALLINGS CROSSING
- ANSONIA
- ASH CREEK
- BALDWIN
- BATES ROCK
- BEACON FALLS
- BEAN HILL
- BERLIN
- BLACK ROCK
- BLOOMFIELD
- BOKUM
- BRANDFORD
- BRANDFORD RR
- BRIDGEPORT ENERGY
- BRISTOL
- BROOKLYN
- BUDDINGTON
- BULLS BRIDGE
- BUNKER HILL
- C.H. DEXTER
- CAMPVILLE
- CANAL ST
- CANTON
- CARMEL HILL
- CHIPPEN HILL
- COMPO
- CONGRESS ST
- COS COB
- DARIEN
- DERBY
- DEVON
- DOOLEY
- DUDLEY
- EAST DEVON
- EAST HARTFORD
- EAST MERIDEN
- EAST NEW BRITAIN
- ELM WEST
- ELMWEST
- FALLS VILLAGE
- FARMINGTON
- FIORT HILL FARMS
- FLANDERS
- FLAX HILL
- FORESTVILLE
- FRANKLIN DRIVE
- FREIGHT
- FRY BROOK
- GALES FERRY
- GLENBROOK
- GRAND AVE
- GREEN HILL
- HANOVER ST
- HAWTHORNE
- HOPEWELL
- JUNE ST
- LISBON
- MANSFIELD
- MIDDLETOWN
- MILFORD POWER
- MILVON
- MIX AVE
- MYSTIC
- NEWINGTON
- NEWTOWN
- NO, WALL
- NOERA
- NORTH CANAAN
- NORTH HAVEN
- NORTHEAST SIMSBURY
- NORWALK
- NORWALK HARBOR
- OLD TOWN
- P & W AIRCRAFT
- PEACEABLE
- PORTLAND
- QUINNIPIAC
- RIDGEFIELD
- RIVERSIDE DR
- ROCKVILLE
- ROCKY HILL
- ROCKY RIVER
- SACKETT
- SALISBURY
- SANDY HOOK
- SASCO CREEK
- SCITICO
- SHAW HILLS
- SHEPAUG
- SHUNOCK
- SKUNGAMAUG
- SOUTH END
- SOUTH MEADOW
- SOUTH MEADOW 2
- SOUTH NAUGATUCK
- SOUTH WINDSOR
- SOUTHWEST HARTFORD
- STEPSTONE
- STEVENSON
- STOCKHOUSE RD
- STONY HILL
- THOMASTON
- TODD
- TOMAC
- TORRINGTON TERMINAL
- TRACY
- TRAP FALLS
- TRIANGLE
- TRUMBULL
- TUNNEL
- UNCASVILLE
- WATER ST
- WATERSIDE
- WEST BROOKFIELD
- WEST RIVER
- WEST SIDE
- WESTON
- WESTON
- WILLIAMS ST
- WINDSOR LOCKS
- WOODMONT
Frequently asked questions
How many electric substations are in Connecticut?
HIFLD records 300 substations in Connecticut, of which 154 carry a station name. That is the 31st-most named substations of any state in the dataset.
What is the highest-voltage substation in Connecticut?
20 named substations in Connecticut share the top voltage of 345 kV, including BARBOUR HILL, BRIDGEPORT HARBOR, BRIDGEPORT RESCO.
Which substation in Connecticut connects the most transmission lines?
SOUTHINGTON has the most connected transmission lines of the named substations listed here, with 14 at up to 345 kV.
How many substations in Connecticut are 345 kV or higher?
20 of 154 named substations (13%) operate at 345 kV or above, compared with 8% nationally. Connecticut ranks 24th of 50 states and DC for named substations at that level.
How many datacenter candidate sites in Connecticut are at substations?
171 of the 919 scored candidate sites in Connecticut are substation sites — locations generated at an existing substation. Scored sites across Connecticut average 56.7 on the 0–100 DC Readiness scale, against 53 nationally.
Looking for a specific record? The directory lists every substation in Connecticut, A to Z.
More on Connecticut, and states with similar counts
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, “Electric substations in Connecticut”, https://gridcensus.com/substations/connecticut (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for substations in Connecticut 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.