Johnson County Maintenance Shed
IndustrialJohnson County, Iowa · MISO
At a glance
Johnson County Maintenance Shed is an industrial datacenter candidate site in Johnson County, Iowa, scoring 56.0/100 DC Readiness — 109th of 112 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 Johnson County Maintenance Shed compare with other sites in Johnson County?
Johnson County Maintenance Shed ranks 109th of 112 scored candidate sites in Johnson County. Its 56.0/100 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 (93 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 Johnson County Maintenance Shed to power, fiber and other datacenters?
The nearest located transmission bottleneck is ALW16X26_WAPELLO_TR91_TR91 (MISO), 68 miles away. For connectivity, the nearest internet exchange facility is DartPoints North Liberty, IA at 8 miles. 18 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is DartPoints North Liberty, IA, 8 miles away.
What are the flood, water and hazard risks at Johnson County Maintenance Shed?
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 |
Johnson County Maintenance Shed: common questions
What is the DC Readiness score of Johnson County Maintenance Shed?
Johnson County Maintenance Shed scores 56.0/100 on the GridCensus DC Readiness scale, rated good. It ranks 109th of 112 scored sites in Johnson County. The Johnson County average is 58.0 and the Iowa average is 56.4.
Which electric utility serves Johnson County Maintenance Shed?
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 Johnson County Maintenance Shed in?
Johnson County Maintenance Shed is in the MISO region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
How far is Johnson County Maintenance Shed from an internet exchange?
The nearest internet exchange facility is DartPoints North Liberty, IA, about 8 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, “Johnson County Maintenance Shed, Johnson County, IA”, https://gridcensus.com/datacenter-sites/iowa/johnson-county/johnson-county-maintenance-shed-b0c179f8 (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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