TAP173399
SubstationWisconsin · NORTHERN STATES POWER CO - WISCONSIN
At a glance
TAP173399 is an electric transmission substation in Wisconsin, on NORTHERN STATES POWER CO - WISCONSIN's transmission network. It is classified as sub-transmission (115 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
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 |
|---|---|---|---|---|
| #175072 | 115 kV | NORTHERN STATES POWER CO - WISCONSIN | IN SERVICE | 0.1 mi |
| #175073 | 115 kV | NORTHERN STATES POWER CO - WISCONSIN | IN SERVICE | 2.0 mi |
| #175075 | 115 kV | NORTHERN STATES POWER CO - WISCONSIN | IN SERVICE | 14.6 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP173399, 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 |
|---|---|---|---|---|---|---|---|
| STONE LAKE | Substation-Adjacent | WI | Washburn County | 345 kV | 600 MW | 4.3 yrs | 61.7 |
| UNKNOWN138654 | Substation-Adjacent | WI | Bayfield County | 115 kV | 100 MW | 4.3 yrs | 57.5 |
| TAP173402 | Substation-Adjacent | WI | Ashland County | 115 kV | 100 MW | 4.3 yrs | 57.4 |
| TAP138650 | Substation-Adjacent | WI | Ashland County | 115 kV | 100 MW | 4.3 yrs | 57.4 |
| TAP173398 | Substation-Adjacent | WI | Washburn County | 161 kV | 100 MW | 4.3 yrs | 57.3 |
| UNKNOWN139714 | Substation-Adjacent | WI | Washburn County | 161 kV | 100 MW | 4.3 yrs | 57.3 |
| UNKNOWN139699 | Substation-Adjacent | WI | Washburn County | 161 kV | 100 MW | 4.3 yrs | 57.2 |
| TAP173400 | Substation-Adjacent | WI | Bayfield County | 115 kV | 100 MW | 4.3 yrs | 57.2 |
Who owns the transmission lines at TAP173399?
The 3 connected lines listed above are owned by NORTHERN STATES POWER CO - WISCONSIN. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 16.7 miles.
How do candidate sites near TAP173399 score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 62 on the 0–100 DC Readiness scale. They fall in Washburn County, Bayfield County, Ashland 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 TAP173399 substation?
TAP173399 has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so TAP173399 is at the national midpoint.
How many transmission lines connect to TAP173399 substation?
3 transmission lines terminate at or pass through TAP173399 in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 16.7 miles.
Who owns TAP173399 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP173399 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 TAP173399 substation located?
TAP173399 is in Wisconsin at 46.2378, -91.2843. The datacenter candidate sites closest to it are in Washburn County, Bayfield County, Ashland County.
Are there datacenter candidate sites near TAP173399 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP173399. The highest-scoring is STONE LAKE at 62/100. 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, “TAP173399 substation, Wisconsin”, https://gridcensus.com/substations/wisconsin/tap173399-ffedae42 (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 TAP173399 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.