TAP138665
SubstationWisconsin · NORTHERN STATES POWER CO - WISCONSIN
At a glance
TAP138665 is an electric transmission substation in Wisconsin, on NORTHERN STATES POWER CO - WISCONSIN's transmission network. It is classified as unclassified 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
Ownership
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #125824 | — | NORTHERN STATES POWER CO - WISCONSIN | IN SERVICE | 0.0 mi |
| #135402 | — | NORTHERN STATES POWER CO - WISCONSIN | IN SERVICE | 8.6 mi |
| #139380 | — | NORTHERN STATES POWER CO - WISCONSIN | IN SERVICE | 18.4 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP138665, 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 |
|---|---|---|---|---|---|---|---|
| GINGLES | Substation-Adjacent | WI | Ashland County | 161 kV | 100 MW | 4.3 yrs | 58.3 |
| OZ Ashland | Greenfield | WI | Ashland | — | — | 4.3 yrs | 57.7 |
| UNKNOWN138654 | Substation-Adjacent | WI | Bayfield County | 115 kV | 100 MW | 4.3 yrs | 57.5 |
| TAP138650 | Substation-Adjacent | WI | Ashland County | 115 kV | 100 MW | 4.3 yrs | 57.4 |
| TAP173402 | Substation-Adjacent | WI | Ashland County | 115 kV | 100 MW | 4.3 yrs | 57.4 |
| TAP173400 | Substation-Adjacent | WI | Bayfield County | 115 kV | 100 MW | 4.3 yrs | 57.2 |
| Bay Front | Brownfield | WI | Ashland County | — | 20 MW | 4.3 yrs | 55.6 |
| UNKNOWN138668 | Substation-Adjacent | WI | Sawyer County | 115 kV | 100 MW | 4.3 yrs | 55.5 |
Who owns the transmission lines at TAP138665?
The 3 connected lines listed above are owned by NORTHERN STATES POWER CO - WISCONSIN. Their combined recorded length is about 27 miles.
How do candidate sites near TAP138665 score?
The 8 highest-scoring candidate sites within about 25 miles range from 56 to 58 on the 0–100 DC Readiness scale. They fall in Ashland County, Ashland, Bayfield County, Sawyer 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
How many transmission lines connect to TAP138665 substation?
3 transmission lines terminate at or pass through TAP138665 in the HIFLD line data. Together the listed lines cover about 27 miles.
Who owns TAP138665 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP138665 belong to NORTHERN STATES POWER CO - WISCONSIN. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP138665 substation located?
TAP138665 is in Wisconsin at 46.6080, -91.2691. The datacenter candidate sites closest to it are in Ashland County, Ashland, Bayfield County.
Are there datacenter candidate sites near TAP138665 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP138665. The highest-scoring is GINGLES at 58/100. 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, “TAP138665 substation, Wisconsin”, https://gridcensus.com/substations/wisconsin/tap138665-1a5a4958 (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 TAP138665 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.