512 South State/11 East Iroquois
IndustrialStephenson County, Illinois · PJM
At a glance
512 South State/11 East Iroquois is an industrial datacenter candidate site in Stephenson County, Illinois, scoring 48.8/100 DC Readiness — 41st of 127 scored sites in the county. It sits in the PJM grid region and the COMMONWEALTH EDISON CO service territory, where interconnection has averaged 4.8 years from request to operation.
Power & interconnection
Speed to power
Deep queue and long historical waits — plan for a multi-year interconnection timeline and engage the utility early.
Connectivity
Site characteristics
Risk & environment
Location context
Regulatory climate
New-DC state tax exemptions suspended for 2 years (from Jul 2026).
Incentive detail: Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.
Site location
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How does 512 South State/11 East Iroquois compare with other sites in Stephenson County?
512 South State/11 East Iroquois ranks 41st of 127 scored candidate sites in Stephenson County. Its 48.8/100 is roughly in line with the county average of 49.2. It is about 10% below the Illinois average of 54.3 and roughly in line with the national average of 53.2.
Against the Illinois average, its strongest sub-score is natural hazard (65 vs 63) and its weakest is fiber connectivity (56 vs 71). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is 512 South State/11 East Iroquois to power, fiber and other datacenters?
The nearest located transmission bottleneck is QUAD CITY - SUB91 345 kV l/o CORDOVA - SUB39 345 kV (PJM), 53 miles away. For connectivity, the nearest internet exchange facility is Rochelle Technology Center at 38.5 miles. 8 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is Rochelle Technology Center, 38.5 miles away.
What are the flood, water and hazard risks at 512 South State/11 East Iroquois?
At the county level, FEMA's National Risk Index rates Stephenson County "Relatively High".
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 Stephenson County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| OZ Stephenson | Greenfield | — | — | 4.8 yrs | 55.6 |
| EC FFE Stephenson County | Greenfield | — | — | 4.8 yrs | 55.4 |
| TAP137880 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.2 |
| UNKNOWN124271 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.2 |
| TAP137878 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.1 |
| UNKNOWN121924 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.1 |
| UNKNOWN124269 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.0 |
| TAP137882 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 54.2 |
512 South State/11 East Iroquois: common questions
What is the DC Readiness score of 512 South State/11 East Iroquois?
512 South State/11 East Iroquois scores 48.8/100 on the GridCensus DC Readiness scale, rated fair. It ranks 41st of 127 scored sites in Stephenson County. The Stephenson County average is 49.2 and the Illinois average is 54.3.
Which electric utility serves 512 South State/11 East Iroquois?
COMMONWEALTH EDISON CO (investor owned) holds the retail service territory that contains the site; its holding company is EXELON CORP.
What grid region is 512 South State/11 East Iroquois in?
512 South State/11 East Iroquois is in the PJM region. Projects interconnecting there have averaged a 4.8-year wait from queue request to operation.
How far is 512 South State/11 East Iroquois from an internet exchange?
The nearest internet exchange facility is Rochelle Technology Center, about 38.5 miles away; 8 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, “512 South State/11 East Iroquois, Stephenson County, IL”, https://gridcensus.com/datacenter-sites/illinois/stephenson-county/512-south-state-11-east-iroquois-e38466d9 (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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