Cornerstone Subdivision
IndustrialYankton County, South Dakota · SPP
At a glance
Cornerstone Subdivision is an industrial datacenter candidate site in Yankton County, South Dakota, scoring 56.7/100 DC Readiness — 17th of 30 scored sites in the county. It sits in the SPP grid region and the NORTHWESTERN ENERGY - (SD) service territory, where interconnection has averaged 4.3 years from request to operation.
Power & interconnection
Speed to power
Middle-of-the-pack interconnection conditions for this grid.
Connectivity
Site characteristics
Risk & environment
Location context
Regulatory climate
No notable statewide DC restriction on record; confirm local zoning and utility tariffs.
Incentive detail: No state corporate income tax; no personal income tax; no personal property tax.
Site location
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How does Cornerstone Subdivision compare with other sites in Yankton County?
Cornerstone Subdivision ranks 17th of 30 scored candidate sites in Yankton County. Its 56.7/100 is roughly in line with the county average of 57.9. It is roughly in line with the South Dakota average of 54.7 and roughly in line with the national average of 53.2.
Against the South Dakota average, its strongest sub-score is fiber connectivity (84 vs 68) and its weakest is power availability (30 vs 39). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Cornerstone Subdivision to power, fiber and other datacenters?
The nearest located transmission bottleneck is Raun_Tekamho_161kV_ftlo_Raun_Ft_Cal_345kV (MISO), 64 miles away. For connectivity, the nearest internet exchange facility is Midco Yankton at 2.2 miles. 10 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is Midco Yankton, 2.2 miles away.
What are the flood, water and hazard risks at Cornerstone Subdivision?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk). At the county level, FEMA's National Risk Index rates Yankton County "Relatively Low".
Full DC Readiness breakdown
All 13 weighted sub-scores (0–100) behind the composite DC Readiness score.
Nearby comparable sites
Other scored datacenter candidate sites in Yankton County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| OZ Yankton | Greenfield | — | — | 4.3 yrs | 66.1 |
| UTICA JUNCTION | Substation-Adjacent | 230 kV | 300 MW | 4.3 yrs | 65.0 |
| TAP155849 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 62.7 |
| UNKNOWN131252 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 61.6 |
| UNKNOWN132474 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 61.1 |
| UNKNOWN159314 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 59.5 |
| UNKNOWN159312 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 59.4 |
| TAP159194 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 59.4 |
Cornerstone Subdivision: common questions
What is the DC Readiness score of Cornerstone Subdivision?
Cornerstone Subdivision scores 56.7/100 on the GridCensus DC Readiness scale, rated good. It ranks 17th of 30 scored sites in Yankton County. The Yankton County average is 57.9 and the South Dakota average is 54.7.
Which electric utility serves Cornerstone Subdivision?
NORTHWESTERN ENERGY - (SD) (investor owned) holds the retail service territory that contains the site; its holding company is NORTHWESTERN ENERGY.
What grid region is Cornerstone Subdivision in?
Cornerstone Subdivision is in the SPP region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
Is Cornerstone Subdivision in a flood zone?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk).
How far is Cornerstone Subdivision from an internet exchange?
The nearest internet exchange facility is Midco Yankton, about 2.2 miles away; 10 fiber providers report service at the location.
Related pages
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 October 10, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Cornerstone Subdivision, Yankton County, SD”, https://gridcensus.com/datacenter-sites/south-dakota/yankton-county/cornerstone-subdivision-11355021 (data as of October 10, 2026).
Dataset updated . Screening estimates derived from public data sources.
Figures are screening estimates derived from public infrastructure data. Catalogued capacity reflects theoretical candidate capacity, not deliverable or committed interconnection. Confirm all values with the utility, ISO, and on-the-ground due diligence.
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