TAP138004
SubstationWisconsin · AMERICAN TRANSMISSION CO
At a glance
TAP138004 is an electric transmission substation in Wisconsin, on AMERICAN TRANSMISSION CO's transmission network. It is classified as sub-transmission (138 kv) and connects 3 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 |
|---|---|---|---|---|
| #115540 | 138 kV | — | IN SERVICE | 7.5 mi |
| #131935 | 138 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 7.5 mi |
| #138723 | 138 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 0.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP138004, 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 |
|---|---|---|---|---|---|---|---|
| EDGEWATER STATION | Substation-Adjacent | WI | Sheboygan County | 345 kV | 600 MW | 4.3 yrs | 66.9 |
| CEDARSAUK | Substation-Adjacent | WI | Ozaukee County | 345 kV | 600 MW | 4.3 yrs | 66.5 |
| TAP138061 | Substation-Adjacent | WI | Washington County | 345 kV | 600 MW | 4.3 yrs | 66.4 |
| CYPRESS | Substation-Adjacent | WI | Calumet County | 345 kV | 600 MW | 4.3 yrs | 66.3 |
| SHEBOYGAN FALLS STATION | Substation-Adjacent | WI | Sheboygan County | 345 kV | 600 MW | 4.3 yrs | 63.1 |
| PORT WASHINGTON SW YD | Substation-Adjacent | WI | Ozaukee County | 138 kV | 100 MW | 4.3 yrs | 62.1 |
| LEDGEVIEW | Substation-Adjacent | WI | Fond du Lac County | 138 kV | 100 MW | 4.3 yrs | 61.3 |
| CEDAR RIDGE WIND (ALTE) | Substation-Adjacent | WI | Fond du Lac County | 138 kV | 100 MW | 4.3 yrs | 61.0 |
Who owns the transmission lines at TAP138004?
The 3 connected lines listed above are owned by AMERICAN TRANSMISSION CO. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 15 miles.
How do candidate sites near TAP138004 score?
The 8 highest-scoring candidate sites within about 25 miles range from 61 to 67 on the 0–100 DC Readiness scale. They fall in Sheboygan County, Ozaukee County, Washington County, Calumet County. The Wisconsin average across 3,340 scored sites is 55.4. 1,248 of those Wisconsin sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is TAP138004 substation?
TAP138004 has a maximum voltage of 138 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so TAP138004 is above the national midpoint.
How many transmission lines connect to TAP138004 substation?
3 transmission lines terminate at or pass through TAP138004 in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 15 miles.
Who owns TAP138004 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP138004 belong to AMERICAN TRANSMISSION CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP138004 substation located?
TAP138004 is in Wisconsin at 43.7385, -87.9813. The datacenter candidate sites closest to it are in Sheboygan County, Ozaukee County, Washington County.
Are there datacenter candidate sites near TAP138004 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP138004. The highest-scoring is EDGEWATER STATION at 67/100. Across Wisconsin, the average DC Readiness score is 55.4.
More in Wisconsin
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, “TAP138004 substation, Wisconsin”, https://gridcensus.com/substations/wisconsin/tap138004-a0983fb4 (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 TAP138004 substation, Wisconsin 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.