Greenfield (UNKNOWN131185 - NEW UNDERWOOD)
GreenfieldPennington County, South Dakota · SPP
At a glance
Greenfield (UNKNOWN131185 - NEW UNDERWOOD) is a greenfield datacenter candidate site in Pennington County, South Dakota, scoring 52.2/100 DC Readiness — 55th of 58 scored sites in the county. Its nearest substation is UNKNOWN131185. It sits in the SPP grid region and the BLACK HILLS POWER, INC. service territory, where interconnection has averaged 4.3 years from request to operation. GridCensus catalogs 100 MW of candidate capacity here.
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
Get alerts
Track Greenfield (UNKNOWN131185 - NEW UNDERWOOD)
Get an email when its DC-readiness score, available capacity, or interconnection-queue status changes.
How does Greenfield (UNKNOWN131185 - NEW UNDERWOOD) compare with other sites in Pennington County?
Greenfield (UNKNOWN131185 - NEW UNDERWOOD) ranks 55th of 58 scored candidate sites in Pennington County. Its 52.2/100 is about 13% below the county average of 59.7. 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 speed to power (55 vs 52) and its weakest is power availability (28 vs 39). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Greenfield (UNKNOWN131185 - NEW UNDERWOOD) to power, fiber and other datacenters?
The nearest mapped substation, UNKNOWN131185, is the closest grid connection point on record and operates at 115 kV. For connectivity, the nearest internet exchange facility is Golden West Rapid City Skyline Facility at 26.5 miles. 7 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is Golden West Rapid City Skyline Facility, 26.5 miles away.
What are the flood, water and hazard risks at Greenfield (UNKNOWN131185 - NEW UNDERWOOD)?
At the county level, FEMA's National Risk Index rates Pennington 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 Pennington County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| EC Coal Pennington County | Greenfield | — | — | 4.3 yrs | 66.9 |
| SOUTH RAPID CITY | Substation-Adjacent | 230 kV | 300 MW | 4.3 yrs | 66.8 |
| RAPID CITY DC TIE | Substation-Adjacent | 230 kV | 300 MW | 4.3 yrs | 65.9 |
| LANGE | Substation-Adjacent | 230 kV | 300 MW | 4.3 yrs | 65.8 |
| EC Near Ben French | Greenfield | — | — | 4.3 yrs | 65.7 |
| EC Near Ben French | Greenfield | — | — | 4.3 yrs | 65.2 |
| EC Coal Pennington County | Greenfield | — | — | 4.3 yrs | 64.6 |
| EC Near Ben French | Greenfield | — | — | 4.3 yrs | 64.4 |
Greenfield (UNKNOWN131185 - NEW UNDERWOOD): common questions
What is the DC Readiness score of Greenfield (UNKNOWN131185 - NEW UNDERWOOD)?
Greenfield (UNKNOWN131185 - NEW UNDERWOOD) scores 52.2/100 on the GridCensus DC Readiness scale, rated fair. It ranks 55th of 58 scored sites in Pennington County. The Pennington County average is 59.7 and the South Dakota average is 54.7.
What is the nearest substation to Greenfield (UNKNOWN131185 - NEW UNDERWOOD)?
The nearest mapped substation is UNKNOWN131185, at 115 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves Greenfield (UNKNOWN131185 - NEW UNDERWOOD)?
BLACK HILLS POWER, INC. (investor owned) holds the retail service territory that contains the site; its holding company is BLACK HILLS POWER INC.
What grid region is Greenfield (UNKNOWN131185 - NEW UNDERWOOD) in?
Greenfield (UNKNOWN131185 - NEW UNDERWOOD) is in the SPP region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
How far is Greenfield (UNKNOWN131185 - NEW UNDERWOOD) from an internet exchange?
The nearest internet exchange facility is Golden West Rapid City Skyline Facility, about 26.5 miles away; 7 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, “Greenfield (UNKNOWN131185 - NEW UNDERWOOD), Pennington County, SD”, https://gridcensus.com/datacenter-sites/south-dakota/pennington-county/greenfield-unknown131185-new-underwood-61ba7215 (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.
Go deeper than the public screen
Every site and score for Greenfield (UNKNOWN131185 - NEW UNDERWOOD), Pennington County 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.