Substation-Adjacent site at 42.602, -90.917
Substation-AdjacentDubuque County, Iowa · MISO
At a glance
Substation-Adjacent site at 42.602, -90.917 is a substation-adjacent datacenter candidate site in Dubuque County, Iowa, scoring 56.9/100 DC Readiness — 38th of 101 scored sites in the county. Its nearest substation is TAP159090 (0 mi, 69 kV). 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. GridCensus catalogs 50 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
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 Substation-Adjacent site at 42.602, -90.917 compare with other sites in Dubuque County?
Substation-Adjacent site at 42.602, -90.917 ranks 38th of 101 scored candidate sites in Dubuque County. Its 56.9/100 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 power availability (46 vs 37) and its weakest is fiber connectivity (75 vs 77). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Substation-Adjacent site at 42.602, -90.917 to power, fiber and other datacenters?
The nearest mapped substation, TAP159090, is about 0 miles away and operates at 69 kV. For connectivity, the nearest internet exchange facility is USSHC at 23.7 miles. 12 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is USSHC, 23.7 miles away.
What are the flood, water and hazard risks at Substation-Adjacent site at 42.602, -90.917?
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 |
Substation-Adjacent site at 42.602, -90.917: common questions
What is the DC Readiness score of Substation-Adjacent site at 42.602, -90.917?
Substation-Adjacent site at 42.602, -90.917 scores 56.9/100 on the GridCensus DC Readiness scale, rated good. It ranks 38th of 101 scored sites in Dubuque County. The Dubuque County average is 55.8 and the Iowa average is 56.4.
What is the nearest substation to Substation-Adjacent site at 42.602, -90.917?
The nearest mapped substation is TAP159090, about 0 miles away, at 69 kV. GridCensus catalogs 50 MW of candidate capacity for the site.
Which electric utility serves Substation-Adjacent site at 42.602, -90.917?
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 Substation-Adjacent site at 42.602, -90.917 in?
Substation-Adjacent site at 42.602, -90.917 is in the MISO region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
How far is Substation-Adjacent site at 42.602, -90.917 from an internet exchange?
The nearest internet exchange facility is USSHC, about 23.7 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, “Substation-Adjacent site at 42.602, -90.917, Dubuque County, IA”, https://gridcensus.com/datacenter-sites/iowa/dubuque-county/tap159090-882b5890 (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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