Substation-Adjacent Datacenter Sites in South Dakota
At a glance
Parcels sited next to existing transmission substations. Co-location with a substation is the single strongest speed-to-power signal — interconnection distance is measured in feet, not miles.
Top substation-adjacent sites in South Dakota
| Site | Type | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|
| SPLIT ROCK | Substation-Adjacent | Minnehaha County | 345 kV | 600 MW | 4.3 yrs | 67.7 |
| SOUTH RAPID CITY | Substation-Adjacent | Pennington County | 230 kV | 300 MW | 4.3 yrs | 66.8 |
| SIOUX FALLS | Substation-Adjacent | Minnehaha County | 230 kV | 300 MW | 4.3 yrs | 66.6 |
| RAPID CITY DC TIE | Substation-Adjacent | Pennington County | 230 kV | 300 MW | 4.3 yrs | 65.9 |
| LANGE | Substation-Adjacent | Pennington County | 230 kV | 300 MW | 4.3 yrs | 65.8 |
| VIRGIL FODNESS | Substation-Adjacent | Lincoln County | 230 kV | 300 MW | 4.3 yrs | 65.2 |
| UTICA JUNCTION | Substation-Adjacent | Yankton County | 230 kV | 300 MW | 4.3 yrs | 65.0 |
| GROTON | Substation-Adjacent | Brown County | 345 kV | 600 MW | 4.3 yrs | 64.8 |
| BROOKINGS COUNTY | Substation-Adjacent | Lincoln County | 345 kV | 600 MW | 4.3 yrs | 64.2 |
| UNKNOWN131330 | Substation-Adjacent | Union County | 230 kV | 300 MW | 4.3 yrs | 64.0 |
| NEW UNDERWOOD | Substation-Adjacent | Pennington County | 230 kV | 300 MW | 4.3 yrs | 63.5 |
| VT HANLON | Substation-Adjacent | McCook County | 230 kV | 300 MW | 4.3 yrs | 63.4 |
| UNKNOWN131108 | Substation-Adjacent | McPherson County | 230 kV | 300 MW | 4.3 yrs | 63.3 |
| WEST HILL | Substation-Adjacent | Fall River County | 230 kV | 300 MW | 4.3 yrs | 63.1 |
| FORT THOMPSON | Substation-Adjacent | Buffalo County | 345 kV | 600 MW | 4.3 yrs | 63.0 |
| UNKNOWN131208 | Substation-Adjacent | Sanborn County | 230 kV | 300 MW | 4.3 yrs | 62.9 |
| GLENHAM | Substation-Adjacent | Walworth County | 230 kV | 300 MW | 4.3 yrs | 62.7 |
| TAP155849 | Substation-Adjacent | Yankton County | 115 kV | 100 MW | 4.3 yrs | 62.7 |
| UNKNOWN131292 | Substation-Adjacent | Minnehaha County | 115 kV | 100 MW | 4.3 yrs | 62.6 |
| FORT RANDALL | Substation-Adjacent | Charles Mix County | 230 kV | 300 MW | 4.3 yrs | 62.6 |
| UNKNOWN158869 | Substation-Adjacent | Minnehaha County | 115 kV | 100 MW | 4.3 yrs | 62.5 |
| PHILIP | Substation-Adjacent | Haakon County | 230 kV | 300 MW | 4.3 yrs | 62.5 |
| UNKNOWN131288 | Substation-Adjacent | Minnehaha County | 115 kV | 100 MW | 4.3 yrs | 62.4 |
| UNKNOWN144208 | Substation-Adjacent | Minnehaha County | 115 kV | 100 MW | 4.3 yrs | 62.4 |
| LAWRENCE | Substation-Adjacent | Minnehaha County | 115 kV | 100 MW | 4.3 yrs | 62.4 |
How does South Dakota compare with other states for substation-adjacent sites?
With 477 sites, South Dakota ranks 34th of the 52 states that have any substation-adjacent candidate sites. Texas leads with 3,635. Nationally, substation-adjacent sites average 57.4/100 DC Readiness, above the 53.0 average across all site types. Across every site type, South Dakota averages 54.7, the 19th-highest of 52 states, and its candidate sites face an average interconnection-queue wait of 4.3 years.
Where are the highest-scoring substation-adjacent sites in South Dakota?
The top 25 range from 67.7 to 62.4 on the 0–100 DC Readiness Score. They are concentrated in Minnehaha County (7), Pennington County (4) and Yankton County (2). By grid region, 15 are in SPP and 10 are in MISO.
County pages: Minnehaha County · Pennington County · Yankton County · Lincoln County
What power, fiber and flood exposure do these substation-adjacent sites have?
Of the top 25 substation-adjacent sites in South Dakota, 25 have a recorded nearest-substation voltage, with a median of 230 kV; for 19 that substation is rated 230 kV or higher. Their counties have a median of 7 fixed fiber broadband providers in FCC data. The median distance to the nearest internet exchange facility is 22 km. The median interconnection-queue wait in their markets is 4.3 years. None of the 7 with a mapped FEMA flood zone sits in a high-risk (A or V) zone.
Frequently asked questions
How many substation-adjacent datacenter sites are in South Dakota?
GridCensus catalogs 477 substation-adjacent datacenter candidate sites in South Dakota, 1% of the national total for this type (34th of 52 states).
What is a substation-adjacent datacenter site?
Parcels sited next to existing transmission substations. Co-location with a substation is the single strongest speed-to-power signal — interconnection distance is measured in feet, not miles.
What is the best substation-adjacent datacenter site in South Dakota?
By DC Readiness Score, SPLIT ROCK in Minnehaha County ranks first at 67.7/100, followed by SOUTH RAPID CITY in Pennington County at 66.8.
Which South Dakota counties have the best substation-adjacent sites?
The top 25 substation-adjacent sites in South Dakota are concentrated in Minnehaha County (7), Pennington County (4) and Yankton County (2).
How does South Dakota score for datacenters overall?
All 1,151 scored sites in South Dakota average 54.7/100 DC Readiness, the 19th-highest of 52 states, against a national average of 53.0.
More on substation-adjacent sites and South Dakota
Substation-Adjacent sites in other states
- Substation-Adjacent sites in Texas· 3,635 sites
- Substation-Adjacent sites in California· 1,573 sites
- Substation-Adjacent sites in Florida· 1,539 sites
- Substation-Adjacent sites in Georgia· 1,530 sites
- Substation-Adjacent sites in Oklahoma· 1,344 sites
- Substation-Adjacent sites in Washington· 1,343 sites
- Substation-Adjacent sites in Minnesota· 1,270 sites
- Substation-Adjacent sites in Kentucky· 1,261 sites
Dataset updated . Screening estimates derived from public data sources.
About this data
Source: GridCensus composite of HIFLD transmission and substation data, EIA, FEMA National Risk Index, FCC broadband data, PeeringDB and ISO interconnection queues, as published November 12, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Substation-Adjacent datacenter sites in South Dakota”, https://gridcensus.com/site-types/substation/south-dakota (data as of November 12, 2026).
Go deeper than the public screen
Every site and score for Substation-Adjacent sites in South Dakota 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.