Greenfield (MAQUOKETA - UNKNOWN131582)
GreenfieldClinton County, Iowa · MISO
At a glance
Greenfield (MAQUOKETA - UNKNOWN131582) is a greenfield datacenter candidate site in Clinton County, Iowa, scoring 52.2/100 DC Readiness — 117th of 118 scored sites in the county. Its nearest substation is MAQUOKETA. 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 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
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 Greenfield (MAQUOKETA - UNKNOWN131582) compare with other sites in Clinton County?
Greenfield (MAQUOKETA - UNKNOWN131582) ranks 117th of 118 scored candidate sites in Clinton County. Its 52.2/100 is roughly in line with the county average of 54.3. 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 natural hazard (70 vs 69) and its weakest is fiber connectivity (66 vs 77). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Greenfield (MAQUOKETA - UNKNOWN131582) to power, fiber and other datacenters?
The nearest mapped substation, MAQUOKETA, is the closest grid connection point on record and operates at 161 kV. For connectivity, the nearest internet exchange facility is USSHC at 28.2 miles. 14 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is USSHC, 28.2 miles away.
What are the flood, water and hazard risks at Greenfield (MAQUOKETA - UNKNOWN131582)?
At the county level, FEMA's National Risk Index rates Clinton 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 Clinton County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| QUAD CITIES | Substation-Adjacent | 345 kV | 600 MW | 4.8 yrs | 66.6 |
| UNKNOWN122188 | Substation-Adjacent | 345 kV | 600 MW | 4.8 yrs | 66.5 |
| ROCK CREEK | Substation-Adjacent | 345 kV | 600 MW | 4.3 yrs | 66.0 |
| UNKNOWN131376 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 62.1 |
| DEWITT | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 60.4 |
| CALAMUS | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 60.2 |
| UNKNOWN122187 | Substation-Adjacent | 161 kV | 100 MW | 4.8 yrs | 60.1 |
| UNKNOWN131582 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 60.0 |
Greenfield (MAQUOKETA - UNKNOWN131582): common questions
What is the DC Readiness score of Greenfield (MAQUOKETA - UNKNOWN131582)?
Greenfield (MAQUOKETA - UNKNOWN131582) scores 52.2/100 on the GridCensus DC Readiness scale, rated fair. It ranks 117th of 118 scored sites in Clinton County. The Clinton County average is 54.3 and the Iowa average is 56.4.
What is the nearest substation to Greenfield (MAQUOKETA - UNKNOWN131582)?
The nearest mapped substation is MAQUOKETA, at 161 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves Greenfield (MAQUOKETA - UNKNOWN131582)?
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 Greenfield (MAQUOKETA - UNKNOWN131582) in?
Greenfield (MAQUOKETA - UNKNOWN131582) is in the MISO region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
How far is Greenfield (MAQUOKETA - UNKNOWN131582) from an internet exchange?
The nearest internet exchange facility is USSHC, about 28.2 miles away; 14 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 (MAQUOKETA - UNKNOWN131582), Clinton County, IA”, https://gridcensus.com/datacenter-sites/iowa/clinton-county/greenfield-maquoketa-unknown131582-d855a4c5 (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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