TAP167821
SubstationSouth Dakota · OTTER TAIL POWER CO
At a glance
TAP167821 is an electric transmission substation in South Dakota, operated by OTTER TAIL POWER CO. It is classified as distribution (69–115 kv) and connects 3 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 |
|---|---|---|---|---|
| #168883 | 69 kV | OTTER TAIL POWER CO | IN SERVICE | 1.6 mi |
| #168884 | 69 kV | OTTER TAIL POWER CO | IN SERVICE | 7.5 mi |
| #168891 | 69 kV | OTTER TAIL POWER CO | IN SERVICE | 11.6 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP167821, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN131144 | Substation-Adjacent | SD | Roberts County | 230 kV | 300 MW | 4.3 yrs | 60.9 |
| OZ Roberts | Greenfield | SD | Roberts | — | — | 4.3 yrs | 59.2 |
| EC Near Webster IC | Greenfield | SD | Day | — | — | 4.3 yrs | 57.2 |
| SUMMIT | Substation-Adjacent | SD | Grant County | 115 kV | 100 MW | 4.3 yrs | 57.0 |
| EC Near Webster IC | Greenfield | SD | Day | — | — | 4.3 yrs | 56.8 |
| EC Near Webster IC | Greenfield | SD | Day | — | — | 4.3 yrs | 56.2 |
| EC Near Webster IC | Greenfield | SD | Day | — | — | 4.3 yrs | 55.9 |
| Greenfield (UNKNOWN175853 - UNKNOWN175855) | Greenfield | SD | Grant County | 230 kV | 300 MW | 4.3 yrs | 54.9 |
Who owns the transmission lines at TAP167821?
The 3 connected lines listed above are owned by OTTER TAIL POWER CO. Line voltages range from 69 kV to 69 kV. Their combined recorded length is about 20.7 miles.
How do candidate sites near TAP167821 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 Roberts County, Roberts, Day, Grant 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 TAP167821 substation?
TAP167821 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 TAP167821 is below the national midpoint.
How many transmission lines connect to TAP167821 substation?
3 transmission lines terminate at or pass through TAP167821 in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 20.7 miles.
Who owns TAP167821 substation?
HIFLD lists OTTER TAIL POWER CO as the operator of TAP167821.
Where is TAP167821 substation located?
TAP167821 is in South Dakota at 45.4793, -97.0099. The datacenter candidate sites closest to it are in Roberts County, Roberts, Day.
Are there datacenter candidate sites near TAP167821 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP167821. The highest-scoring is UNKNOWN131144 at 61/100. Across South Dakota, the average DC Readiness score is 54.7.
More 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, “TAP167821 substation, South Dakota”, https://gridcensus.com/substations/south-dakota/tap167821-a33a38bb (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 TAP167821 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.