SUNDANCE HILL
SubstationSouth Dakota · BLACK HILLS POWER INC
At a glance
SUNDANCE HILL is an electric transmission substation in South Dakota, on BLACK HILLS POWER INC's transmission network. It is classified as sub-transmission (115 kv) and connects 5 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 |
|---|---|---|---|---|
| #210192 | 115 kV | MONTANA-DAKOTA UTILITIES CO | — | 19.3 mi |
| #143061 | 69 kV | — | IN SERVICE | 9.2 mi |
| #143404 | 69 kV | — | IN SERVICE | 12.6 mi |
| #148879 | 69 kV | BLACK HILLS POWER, INC. D/B/A | IN SERVICE | 20.2 mi |
| #116436 | — | BLACK HILLS POWER INC | IN SERVICE | 0.5 mi |
| #179894 | — | — | IN SERVICE | 0.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of SUNDANCE HILL, 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 |
|---|---|---|---|---|---|---|---|
| LOOKOUT | Substation-Adjacent | SD | Lawrence County | 230 kV | 300 MW | 4.3 yrs | 61.2 |
| YELLOW CREEK | Substation-Adjacent | SD | Lawrence County | 230 kV | 300 MW | 4.3 yrs | 61.1 |
| UNKNOWN167677 | Substation-Adjacent | SD | Butte County | 115 kV | 100 MW | 4.3 yrs | 57.6 |
| UNKNOWN167680 | Substation-Adjacent | SD | Butte County | 115 kV | 100 MW | 4.3 yrs | 57.6 |
| SUNDANCE HILL | Substation-Adjacent | SD | Lawrence County | 115 kV | 100 MW | 4.3 yrs | 57.3 |
| UNKNOWN131334 | Substation-Adjacent | SD | Lawrence County | 69 kV | 50 MW | 4.3 yrs | 56.3 |
| UNKNOWN131498 | Substation-Adjacent | SD | Lawrence County | 69 kV | 50 MW | 4.3 yrs | 56.0 |
| TAP208422 | Substation-Adjacent | WY | Crook County | 115 kV | 100 MW | 4.3 yrs | 55.2 |
How does SUNDANCE HILL compare with other substations in South Dakota?
South Dakota has 970 substation records in HIFLD, of which 40 carry a station name; the rest are unnamed tap points, risers and line ends. 7 named substations in the state are in SUNDANCE HILL's 115–229 kV band (18% of named stations). 29 sit in a higher band. 6 named substations in South Dakota operate at 345 kV or above. The highest voltage recorded in the state is 345 kV, and the state median is 230 kV.
Who owns the transmission lines at SUNDANCE HILL?
The 6 connected lines listed above are owned by MONTANA-DAKOTA UTILITIES CO, BLACK HILLS POWER, INC. D/B/A, BLACK HILLS POWER INC. Line voltages range from 69 kV to 115 kV. Their combined recorded length is about 61.7 miles.
How do candidate sites near SUNDANCE HILL score?
The 8 highest-scoring candidate sites within about 25 miles range from 55 to 61 on the 0–100 DC Readiness scale. They fall in Lawrence County, Butte County, Crook County. The South Dakota average across 1,151 scored sites is 54.7. 477 of those South Dakota sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is SUNDANCE HILL substation?
SUNDANCE HILL has a maximum voltage of 115 kV and a minimum of 69 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so SUNDANCE HILL is at the national midpoint.
How many transmission lines connect to SUNDANCE HILL substation?
5 transmission lines terminate at or pass through SUNDANCE HILL in the HIFLD line data. The connected lines listed here run at 115 kV, 69 kV. Together the listed lines cover about 61.7 miles.
Who owns SUNDANCE HILL substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at SUNDANCE HILL belong to BLACK HILLS POWER INC, and others to BLACK HILLS POWER, INC. D/B/A, MONTANA-DAKOTA UTILITIES CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is SUNDANCE HILL substation located?
SUNDANCE HILL is in South Dakota at 44.6632, -103.8600. The datacenter candidate sites closest to it are in Lawrence County, Butte County, Crook County.
Are there datacenter candidate sites near SUNDANCE HILL substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of SUNDANCE HILL. The highest-scoring is LOOKOUT at 61/100. Across South Dakota, the average DC Readiness score is 54.7.
Other 115 kV substations in South Dakota
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, “SUNDANCE HILL substation, South Dakota”, https://gridcensus.com/substations/south-dakota/sundance-hill-555488dd (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 SUNDANCE HILL substation, 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.