SOUTHWEST DELAVAN
SubstationWisconsin · AMERICAN TRANSMISSION CO
At a glance
SOUTHWEST DELAVAN is an electric transmission substation in Wisconsin, on AMERICAN TRANSMISSION CO's transmission network. It is classified as sub-transmission (138 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #104994 | 138 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 4.1 mi |
| #127425 | 138 kV | AMERICAN TRANSMISSION CO | IN SERVICE | 5.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of SOUTHWEST DELAVAN, 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 |
|---|---|---|---|---|---|---|---|
| CHRISTIANA | Substation-Adjacent | WI | Jefferson County | 345 kV | 600 MW | 4.3 yrs | 65.8 |
| KITTYHAWK | Substation-Adjacent | WI | Rock County | 345 kV | 600 MW | 4.3 yrs | 64.6 |
| CHERRY VALLEY | Substation-Adjacent | IL | Boone County | 345 kV | 600 MW | 4.8 yrs | 63.6 |
| Rockford Community Solar | Brownfield | IL | Winnebago | — | 3 MW | 4.8 yrs | 63.0 |
| TAP137873 | Substation-Adjacent | IL | Boone County | 345 kV | 600 MW | 4.8 yrs | 62.9 |
| UNKNOWN122295 | Substation-Adjacent | IL | Boone County | 345 kV | 600 MW | 4.8 yrs | 62.8 |
| PLEASANT VALLEY | Substation-Adjacent | IL | McHenry County | 345 kV | 600 MW | 4.8 yrs | 62.4 |
| EC Near Sheepskin | Greenfield | WI | Rock | — | — | 4.3 yrs | 62.2 |
How does SOUTHWEST DELAVAN 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 SOUTHWEST DELAVAN'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 SOUTHWEST DELAVAN?
The 2 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 9.2 miles.
How do candidate sites near SOUTHWEST DELAVAN score?
The 8 highest-scoring candidate sites within about 25 miles range from 62 to 66 on the 0–100 DC Readiness scale. They fall in Jefferson County, Rock County, Boone County, Winnebago. 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 SOUTHWEST DELAVAN substation?
SOUTHWEST DELAVAN 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 SOUTHWEST DELAVAN is above the national midpoint.
How many transmission lines connect to SOUTHWEST DELAVAN substation?
2 transmission lines terminate at or pass through SOUTHWEST DELAVAN in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 9.2 miles.
Who owns SOUTHWEST DELAVAN substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at SOUTHWEST DELAVAN belong to AMERICAN TRANSMISSION CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is SOUTHWEST DELAVAN substation located?
SOUTHWEST DELAVAN is in Wisconsin at 42.6145, -88.6755. The datacenter candidate sites closest to it are in Jefferson County, Rock County, Boone County.
Are there datacenter candidate sites near SOUTHWEST DELAVAN substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of SOUTHWEST DELAVAN. The highest-scoring is CHRISTIANA at 66/100. Across Wisconsin, the average DC Readiness score is 55.4.
Other 138 kV substations in Wisconsin
- PULLIAM SW YD· 12 lines
- PORTAGE· 9 lines
- ROCK RIVER· 9 lines
- 96TH ST· 8 lines
- ASPEN· 8 lines
- HIGHWAY V· 8 lines
- NORTH FOND DU LAC· 8 lines
- BOC GASSES· 7 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, “SOUTHWEST DELAVAN substation, Wisconsin”, https://gridcensus.com/substations/wisconsin/southwest-delavan-0420c001 (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 SOUTHWEST DELAVAN 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.