WALNUT
SubstationWisconsin
At a glance
WALNUT is an electric transmission substation in Wisconsin. It is classified as distribution (69–115 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
No owner is recorded for the lines that connect here.
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #166432 | 69 kV | — | IN SERVICE | 1.2 mi |
| #166434 | 69 kV | — | IN SERVICE | 2.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of WALNUT, 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 | 4.3 yrs | 69.6 |
| NORTH MADISON 345/138KV | Substation-Adjacent | WI | Dane County | 345 kV | 600 MW | 4.3 yrs | 67.7 |
| CHRISTIANA | Substation-Adjacent | WI | Jefferson County | 345 kV | 600 MW | 4.3 yrs | 65.8 |
| OZ Dane | Greenfield | WI | Dane | — | — | 4.3 yrs | 64.9 |
| EC Near Blount Street | Greenfield | WI | Dane | — | — | 4.3 yrs | 64.5 |
| OZ Dane | Greenfield | WI | Dane | — | — | 4.3 yrs | 64.4 |
| OZ Dane | Greenfield | WI | Dane | — | — | 4.3 yrs | 64.2 |
| BLOUNT | Substation-Adjacent | WI | Dane County | 138 kV | 100 MW | 4.3 yrs | 64.2 |
How does WALNUT 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. 340 named substations in the state are in WALNUT's 69–114 kV band (44% of named stations). 370 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.
How do candidate sites near WALNUT score?
The 8 highest-scoring candidate sites within about 25 miles range from 64 to 70 on the 0–100 DC Readiness scale. They fall in Dane County, Jefferson County, Dane. 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 WALNUT substation?
WALNUT has a maximum voltage of 69 kV. That places it in the 69–114 kV band. The median named US substation in this dataset is 115 kV, so WALNUT is below the national midpoint.
How many transmission lines connect to WALNUT substation?
2 transmission lines terminate at or pass through WALNUT in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 3.7 miles.
Where is WALNUT substation located?
WALNUT is in Wisconsin at 43.0742, -89.4235. The datacenter candidate sites closest to it are in Dane County, Jefferson County, Dane.
Are there datacenter candidate sites near WALNUT substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of WALNUT. The highest-scoring is CARDINAL at 70/100. Across Wisconsin, the average DC Readiness score is 55.4.
Other 69 kV substations in Wisconsin
- EAST CAMPUS· 6 lines
- DAM HEIGHTS· 5 lines
- HILLTOP (ALTE)· 5 lines
- WEST MIDDLETON· 5 lines
- BERLIN· 4 lines
- CHAFFEE CREEK· 4 lines
- COLUMBUS MUNI 1· 4 lines
- DEFOREST· 4 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, “WALNUT substation, Wisconsin”, https://gridcensus.com/substations/wisconsin/walnut-b34fbc7d (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 WALNUT 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.