MILLSTONE
SubstationNew York · CONNECTICUT LIGHT & POWER CO
MILLSTONE is an electric transmission substation in New York, operated by CONNECTICUT LIGHT & POWER CO. 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #2804 | 345 kV | — | — | 0.8 mi |
| #6588 | 345 kV | — | IN SERVICE | 0.4 mi |
| #6859 | 345 kV | — | IN SERVICE | 0.2 mi |
| #7450 | 345 kV | — | — | 0.1 mi |
| #10713 | 345 kV | — | IN SERVICE | 28.8 mi |
| #10751 | 345 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 26.5 mi |
| #31408 | 345 kV | — | IN SERVICE | 12.2 mi |
| #32864 | 345 kV | — | IN SERVICE | 0.4 mi |
| #36307 | 345 kV | CONNECTICUT LIGHT & POWER CO | IN SERVICE | 46.9 mi |
| #44173 | 345 kV | — | IN SERVICE | 0.4 mi |
| #47710 | 345 kV | — | — | 0.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MILLSTONE, 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 |
|---|---|---|---|---|---|---|---|
| MILLSTONE | Substation-Adjacent | CT | Southeastern Connecticut Planning Region | 345 kV | 600 MW | 3.5 yrs | 68.8 |
| CHASE HILL | Substation-Adjacent | RI | Washington County | 115 kV | 100 MW | 3.5 yrs | 67.1 |
| 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 |
| SHUNOCK | Substation-Adjacent | CT | Southeastern Connecticut Planning Region | 115 kV | 100 MW | 3.5 yrs | 62.9 |
| UNKNOWN133286 | Substation-Adjacent | CT | Southeastern Connecticut Planning Region | 115 kV | 100 MW | 3.5 yrs | 62.5 |
| SHUNOCK | Substation-Adjacent | RI | Washington County | 115 kV | 100 MW | 3.5 yrs | 62.4 |
| TAP136492 | Substation-Adjacent | CT | Southeastern Connecticut Planning Region | 115 kV | 100 MW | 3.5 yrs | 62.1 |
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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This page shows a public slice of the GridCensus dataset for MILLSTONE substation, New York. 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.