HADDAM
SubstationNew York · CONNECTICUT LIGHT & POWER CO
HADDAM is an electric transmission substation in New York, operated by CONNECTICUT LIGHT & POWER CO. It is classified as high-voltage (345 kv) and connects 7 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 |
|---|---|---|---|---|
| #10751 | 345 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 26.5 mi |
| #21118 | 345 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 15.5 mi |
| #10744 | 115 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 13.0 mi |
| #10720 | 115 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 12.0 mi |
| #10808 | 115 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 13.7 mi |
| #10809 | 115 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 16.4 mi |
| #10722 | 115 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 12.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of HADDAM, 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 |
|---|---|---|---|---|---|---|---|
| NO. WALL | Substation-Adjacent | CT | South Central Connecticut Planning Region | 345 kV | 600 MW | 3.5 yrs | 70.0 |
| MANCHESTER | Substation-Adjacent | CT | Capitol Planning Region | 345 kV | 600 MW | 3.5 yrs | 69.1 |
| MILLSTONE | Substation-Adjacent | CT | Southeastern Connecticut Planning Region | 345 kV | 600 MW | 3.5 yrs | 68.8 |
| TAP136499 | Substation-Adjacent | CT | Capitol Planning Region | 345 kV | 600 MW | 3.5 yrs | 67.6 |
| EAST HARTFORD | Substation-Adjacent | CT | Capitol Planning Region | 115 kV | 100 MW | 3.5 yrs | 65.7 |
| CARD` | Substation-Adjacent | CT | Southeastern Connecticut Planning Region | 345 kV | 600 MW | 3.5 yrs | 65.3 |
| MONTVILLE | Substation-Adjacent | CT | Southeastern Connecticut Planning Region | 345 kV | 600 MW | 3.5 yrs | 64.9 |
| TAP140774 | Substation-Adjacent | CT | Capitol Planning Region | 115 kV | 100 MW | 3.5 yrs | 64.5 |
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.
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