THREE LAKES
SubstationWisconsin · AMERICAN TRANSMISSION CO
At a glance
THREE LAKES is an electric transmission substation in Wisconsin, on AMERICAN TRANSMISSION CO's transmission network. It is classified as sub-transmission (115 kv) and connects 2 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 |
|---|---|---|---|---|
| #118056 | 115 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 17.1 mi |
| #144093 | 115 kV | NORTHERN STATES POWER CO - WISCONSIN | IN SERVICE | 10.2 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of THREE LAKES, 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 |
|---|---|---|---|---|---|---|---|
| EC Near Rhinelander Mill | Greenfield | WI | Oneida | — | — | 4.3 yrs | 58.0 |
| RHINELANDER PAPER | Substation-Adjacent | WI | Oneida County | 115 kV | 100 MW | 4.3 yrs | 56.7 |
| EC Near Eagle River | Greenfield | WI | Vilas | — | — | 4.3 yrs | 56.7 |
| HIGHWAY EIGHT | Substation-Adjacent | WI | Oneida County | 115 kV | 100 MW | 4.3 yrs | 56.5 |
| HODAG | Substation-Adjacent | WI | Oneida County | 115 kV | 100 MW | 4.3 yrs | 56.3 |
| EC Near Rhinelander Mill | Greenfield | WI | Oneida | — | — | 4.3 yrs | 55.9 |
| ST GERMAIN | Substation-Adjacent | WI | Vilas County | 115 kV | 100 MW | 4.3 yrs | 55.9 |
| THREE LAKES | Substation-Adjacent | WI | Oneida County | 115 kV | 100 MW | 4.3 yrs | 55.8 |
How does THREE LAKES compare with other substations in Wisconsin?
Wisconsin has 1,930 substation records in HIFLD, of which 768 carry a station name; the rest are unnamed tap points, risers and line ends. 334 named substations in the state are in THREE LAKES's 115–229 kV band (43% of named stations). 36 sit in a higher band. 34 named substations in Wisconsin operate at 345 kV or above. The highest voltage recorded in the state is 345 kV, and the state median is 115 kV.
Who owns the transmission lines at THREE LAKES?
The 2 connected lines listed above are owned by AMERICAN TRANSMISSION CO, NORTHERN STATES POWER CO - WISCONSIN. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 27.3 miles.
How do candidate sites near THREE LAKES 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 Oneida, Oneida County, Vilas, Vilas 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 THREE LAKES substation?
THREE LAKES 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 THREE LAKES is at the national midpoint.
How many transmission lines connect to THREE LAKES substation?
2 transmission lines terminate at or pass through THREE LAKES in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 27.3 miles.
Who owns THREE LAKES substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at THREE LAKES belong to AMERICAN TRANSMISSION CO, and others to NORTHERN STATES POWER CO - WISCONSIN. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is THREE LAKES substation located?
THREE LAKES is in Wisconsin at 45.7908, -89.1637. The datacenter candidate sites closest to it are in Oneida, Oneida County, Vilas.
Are there datacenter candidate sites near THREE LAKES substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of THREE LAKES. The highest-scoring is EC Near Rhinelander Mill at 58/100. Across Wisconsin, the average DC Readiness score is 55.4.
Other 115 kV substations in Wisconsin
- MORRISON AVE· 10 lines
- NORTHERN STEEL CASTING· 8 lines
- T CORNERS· 7 lines
- PINE (WPS)· 6 lines
- SHERMAN ST· 6 lines
- HIGHWAY EIGHT· 5 lines
- KELLY· 5 lines
- WHITING AVE· 5 lines
- All named substations in Wisconsin· 768 stations
- Datacenter candidate sites in Wisconsin· 3,340 sites
- Brownfield and retired plant sites in Wisconsin
- Substations by state
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, “THREE LAKES substation, Wisconsin”, https://gridcensus.com/substations/wisconsin/three-lakes-5f890cd6 (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 THREE LAKES 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.