NORTH MADISON 345/138KV
SubstationWisconsin · AMERICAN TRANSMISSION CO
NORTH MADISON 345/138KV is an electric transmission substation in Wisconsin, operated by AMERICAN TRANSMISSION CO. It is classified as high-voltage (345 kv) and connects 5 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 |
|---|---|---|---|---|
| #31427 | 345 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 17.2 mi |
| #32938 | 345 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 17.1 mi |
| #2472 | 138 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 4.5 mi |
| #34572 | 138 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 21.0 mi |
| #41398 | 138 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 8.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of NORTH MADISON 345/138KV, 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 |
|---|---|---|---|---|---|---|---|
| CARDINAL | Substation-Adjacent | WI | Dane County | 345 kV | 600 MW | 1.4 yrs | 76.8 |
| NORTH MADISON 345/138KV | Substation-Adjacent | WI | Dane County | 345 kV | 600 MW | 1.4 yrs | 74.4 |
| CHRISTIANA | Substation-Adjacent | WI | Jefferson County | 345 kV | 600 MW | 1.4 yrs | 73.7 |
| COLUMBIA | Substation-Adjacent | WI | Columbia County | 345 kV | 600 MW | 1.4 yrs | 72.9 |
| RISER162998 | Substation-Adjacent | WI | Dane County | 138 kV | 100 MW | 1.4 yrs | 72.8 |
| YAHARA RIVER | Substation-Adjacent | WI | Dane County | 138 kV | 100 MW | 1.4 yrs | 72.0 |
| FOX HILLS | Substation-Adjacent | WI | Sauk County | 138 kV | 100 MW | 1.4 yrs | 71.9 |
| LOCH MIRROR | Substation-Adjacent | WI | Sauk County | 138 kV | 100 MW | 1.4 yrs | 71.8 |
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 NORTH MADISON 345/138KV substation, Wisconsin. 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.