Former Mine site at 42.447, -90.921
Former MineDubuque County, Iowa · MISO
At a glance
Former Mine site at 42.447, -90.921 is a former mine datacenter candidate site in Dubuque County, Iowa, scoring 54.9/100 DC Readiness — 58th of 101 scored sites in the county. It sits in the MISO grid region and the INTERSTATE POWER AND LIGHT CO 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
Strong incentives; utilities courting hyperscale load.
Incentive detail: Sales tax exemption on DC equipment for $1M+ investments; property tax phase-in for new construction.
Site location
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How does Former Mine site at 42.447, -90.921 compare with other sites in Dubuque County?
Former Mine site at 42.447, -90.921 ranks 58th of 101 scored candidate sites in Dubuque County. Its 54.9/100 is roughly in line with the county average of 55.8. It is roughly in line with the Iowa average of 56.4 and roughly in line with the national average of 53.2.
Against the Iowa average, its strongest sub-score is fiber connectivity (84 vs 77) and its weakest is power availability (30 vs 37). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Former Mine site at 42.447, -90.921 to power, fiber and other datacenters?
For connectivity, the nearest internet exchange facility is USSHC at 14.3 miles. 12 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is USSHC, 14.3 miles away.
What are the flood, water and hazard risks at Former Mine site at 42.447, -90.921?
At the county level, FEMA's National Risk Index rates Dubuque County "Relatively Moderate".
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 Dubuque County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| SALEM | Substation-Adjacent | 345 kV | 600 MW | 4.3 yrs | 65.2 |
| EC Coal Dubuque County | Greenfield | — | — | 4.3 yrs | 62.2 |
| EC Coal Dubuque County | Greenfield | — | — | 4.3 yrs | 62.0 |
| EC Near Dubuque | Greenfield | — | — | 4.3 yrs | 61.2 |
| UNKNOWN130699 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 60.4 |
| HICKORY CREEK | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 60.3 |
| UNKNOWN136983 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 60.1 |
| UNKNOWN131370 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 59.9 |
Former Mine site at 42.447, -90.921: common questions
What is the DC Readiness score of Former Mine site at 42.447, -90.921?
Former Mine site at 42.447, -90.921 scores 54.9/100 on the GridCensus DC Readiness scale, rated fair. It ranks 58th of 101 scored sites in Dubuque County. The Dubuque County average is 55.8 and the Iowa average is 56.4.
Which electric utility serves Former Mine site at 42.447, -90.921?
INTERSTATE POWER AND LIGHT CO (investor owned) holds the retail service territory that contains the site; its holding company is ALLIANT ENERGY CORP.
What grid region is Former Mine site at 42.447, -90.921 in?
Former Mine site at 42.447, -90.921 is in the MISO region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
How far is Former Mine site at 42.447, -90.921 from an internet exchange?
The nearest internet exchange facility is USSHC, about 14.3 miles away; 12 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, “Former Mine site at 42.447, -90.921, Dubuque County, IA”, https://gridcensus.com/datacenter-sites/iowa/dubuque-county/mine-site-a3b790e2 (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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