Datacenter Sites in Union County, South Dakota
Union County has 20 scored datacenter candidate sites averaging 56.4/100 DC Readiness, with a catalogued aggregate of 1,000 MW. FEMA rates local natural-hazard risk as "Relatively Low". The county has a datacenter tax incentive on record.
At a glance
Union County, South Dakota has 20 scored datacenter candidate sites averaging 56.4/100 DC Readiness, roughly in line with the South Dakota average of 54.7. It ranks 25th of 52 South Dakota counties by number of sites and 10th by average score. The top-scoring site is Substation-Adjacent site · de1c3ed0 at 64.0/100.
Site-selection context for Union County
Incentive detail: No state corporate income tax; no personal income tax; no personal property tax.
How does Union County compare with other counties in South Dakota?
By number of scored sites, Union County ranks 25th of the 52 South Dakota counties with a county page, holding 1.7% of the state's 1,151 sites. Its average DC Readiness of 56.4/100 ranks 10th in the state and is roughly in line with the national average of 53.0. Nationally it has the 1729th-largest site inventory of 2,964 counties with five or more sites. 0 sites score 70 or higher and 15 score 55 or higher.
What types of datacenter sites are in Union County?
Substation-Adjacent sites are the most common (15, 75% of the county's inventory), followed by former mine (3) and industrial (2). Site type reflects how the parcel was identified — next to a substation, on a former mine or brownfield, on industrial or federal excess land — and is scored on the same 14 factors either way.
What are power cost, hazard, water and fiber conditions in Union County?
Industrial electricity averages 5.99¢/kWh and commercial 8.26¢/kWh. FEMA's National Risk Index rates the county "Relatively Low" (22). WRI water stress is low-medium. 10 fiber providers report service in the county. The climate runs 700 cooling degree days a year with a mean temperature of 45°F. Land is valued around $7,151 an acre.
By site type
Top datacenter sites in Union County
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| UNKNOWN131330 | Substation-Adjacent | 230 kV | 300 MW | 4.3 yrs | 64.0 |
| TAP167963 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 59.7 |
| TAP167850 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 58.1 |
| UNKNOWN167848 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 57.7 |
| TAP161878 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 57.5 |
| TAP161875 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 57.3 |
| TAP161876 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 57.2 |
| TAP161874 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 57.1 |
| UNKNOWN167847 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 56.9 |
| UNKNOWN161873 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 56.9 |
| UNKNOWN159932 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 56.6 |
| UNKNOWN161871 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 56.4 |
| TAP161870 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 56.4 |
| TAP159926 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 56.4 |
| UNKNOWN159221 | Substation-Adjacent | 69 kV | 50 MW | 4.3 yrs | 55.4 |
| Former Bosse Oil Company Property | Industrial | — | — | 4.3 yrs | 54.6 |
| Mine Site | Former Mine | — | — | 4.3 yrs | 53.0 |
| Mine Site | Former Mine | — | — | 4.3 yrs | 52.9 |
| Alcester Grain and Feed | Industrial | — | — | 4.3 yrs | 52.0 |
| Mine Site | Former Mine | — | — | 4.3 yrs | 51.8 |
Every scored site in Union County
All 20 sites, best first.
- Substation-Adjacent site · de1c3ed0 · 64.0
- Substation-Adjacent site · 6cd294e2 · 59.7
- Substation-Adjacent site · e2da43c3 · 58.1
- Substation-Adjacent site · 6ee3d628 · 57.7
- Substation-Adjacent site · e259c34c · 57.5
- Substation-Adjacent site · 56897541 · 57.3
- Substation-Adjacent site · 00e072d4 · 57.2
- Substation-Adjacent site · 8ea5bece · 57.1
- Substation-Adjacent site · 269ffd25 · 56.9
- Substation-Adjacent site · c72a1774 · 56.9
- Substation-Adjacent site · afa0d5df · 56.6
- Substation-Adjacent site · e4e67183 · 56.4
- Substation-Adjacent site · 31105010 · 56.4
- Substation-Adjacent site · 84c4e053 · 56.4
- Substation-Adjacent site · 9a177e71 · 55.4
- Former Bosse Oil Company Property · 54.6
- Mine Site · fba771a2 · 53.0
- Mine Site · 548ca3da · 52.9
- Alcester Grain and Feed · 52.0
- Mine Site · 8d4a2fc7 · 51.8
Union County datacenter FAQ
How many datacenter sites are in Union County?
20 scored datacenter candidate sites, averaging 56.4/100 DC Readiness. That is the 25th-most of 52 South Dakota counties with five or more sites.
What is the highest-scoring datacenter site in Union County?
Substation-Adjacent site · de1c3ed0 scores 64.0/100 DC Readiness, the highest of the 20 scored sites in Union County (a substation-adjacent site).
Does Union County offer datacenter tax incentives?
No state corporate income tax; no personal income tax; no personal property tax.
What is the natural-hazard risk in Union County?
FEMA's National Risk Index rates Union County as "Relatively Low" (score 22).
What are industrial electricity rates in Union County?
Average industrial electricity is 5.99¢/kWh and commercial is 8.26¢/kWh in Union County.
More in South Dakota
- All datacenter sites in South Dakota· 1,151 sites
- Operating datacenters in South Dakota
- Electric substations in South Dakota
- Minnehaha County· 95 sites · avg 58.1
- Day County· 82 sites · avg 51.9
- Pennington County· 58 sites · avg 59.7
- Beadle County· 51 sites · avg 55.1
- Charles Mix County· 40 sites · avg 53.4
- Brown County· 37 sites · avg 57.4
- Substation-Adjacent sites in South Dakota
- Former Mine sites in South Dakota
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, “Datacenter candidate sites in Union County, South Dakota”, https://gridcensus.com/datacenter-sites/south-dakota/union-county (data as of November 12, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for Union County, 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.