Greenfield (UNKNOWN131599 - HILLS)
GreenfieldJohnson County, Iowa · MISO
At a glance
Greenfield (UNKNOWN131599 - HILLS) is a greenfield datacenter candidate site in Johnson County, Iowa, scoring 55.5/100 DC Readiness — 112th of 112 scored sites in the county. Its nearest substation is UNKNOWN131599. It sits in the MISO grid region and the MIDAMERICAN ENERGY 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 (UNKNOWN131599 - HILLS) compare with other sites in Johnson County?
Greenfield (UNKNOWN131599 - HILLS) ranks 112th of 112 scored candidate sites in Johnson County. Its 55.5/100 is roughly in line with the county average of 58.0. 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 (86 vs 77) and its weakest is power availability (32 vs 37). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Greenfield (UNKNOWN131599 - HILLS) to power, fiber and other datacenters?
The nearest mapped substation, UNKNOWN131599, is the closest grid connection point on record and operates at 161 kV. The nearest located transmission bottleneck is ALW16X26_WAPELLO_TR91_TR91 (MISO), 56 miles away. For connectivity, the nearest internet exchange facility is DartPoints North Liberty, IA at 13 miles. 18 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is ForceAmp.com, 9.3 miles away.
What are the flood, water and hazard risks at Greenfield (UNKNOWN131599 - HILLS)?
At the county level, FEMA's National Risk Index rates Johnson 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 Johnson County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| TIFFIN | Substation-Adjacent | 345 kV | 600 MW | 4.3 yrs | 68.2 |
| HILLS | Substation-Adjacent | 345 kV | 600 MW | 4.3 yrs | 67.3 |
| EC Near University of Iowa Main Power Plant | Greenfield | — | — | 4.3 yrs | 65.9 |
| RISER137658 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 63.7 |
| UNKNOWN137654 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 63.7 |
| UNKNOWN159106 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 63.7 |
| UNKNOWN132168 | Substation-Adjacent | 161 kV | 100 MW | 4.3 yrs | 62.8 |
| EC Near University of Iowa Main Power Plant | Greenfield | — | — | 4.3 yrs | 62.8 |
Greenfield (UNKNOWN131599 - HILLS): common questions
What is the DC Readiness score of Greenfield (UNKNOWN131599 - HILLS)?
Greenfield (UNKNOWN131599 - HILLS) scores 55.5/100 on the GridCensus DC Readiness scale, rated good. It ranks 112th of 112 scored sites in Johnson County. The Johnson County average is 58.0 and the Iowa average is 56.4.
What is the nearest substation to Greenfield (UNKNOWN131599 - HILLS)?
The nearest mapped substation is UNKNOWN131599, at 161 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves Greenfield (UNKNOWN131599 - HILLS)?
MIDAMERICAN ENERGY CO (investor owned) holds the retail service territory that contains the site; its holding company is BERKSHIRE HATHAWAY ENERGY.
What grid region is Greenfield (UNKNOWN131599 - HILLS) in?
Greenfield (UNKNOWN131599 - HILLS) is in the MISO region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
How far is Greenfield (UNKNOWN131599 - HILLS) from an internet exchange?
The nearest internet exchange facility is DartPoints North Liberty, IA, about 13 miles away; 18 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 (UNKNOWN131599 - HILLS), Johnson County, IA”, https://gridcensus.com/datacenter-sites/iowa/johnson-county/greenfield-unknown131599-hills-241fd1d5 (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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