Dubuque County Power Outage History
2014–2025 · Iowa
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 12, 2017 | 8 hrs | 9,599 (17%) | Thunderstorm Wind |
| Jun 30, 2019 | 22 hrs | 8,367 (14%) | Thunderstorm Wind |
| Jul 15, 2024 | 22 hrs | 7,974 (14%) | Flood |
| Jul 12, 2017 | 13 hrs | 7,770 (13%) | Thunderstorm Wind |
| Jun 24, 2016 | 4 hrs | 6,156 (11%) | Unnamed event |
Over the 12 years from 2014 to 2025, Dubuque County recorded 307 distinct power outage events, averaging 1.6 hours per event.
The single worst outage on record in Dubuque County started July 12, 2017 (Thunderstorm Wind), lasting 8 hours and leaving up to 9,599 customers without power (17% of the county) at its peak.
June has historically been the worst month for outages in Dubuque County, with 48 events recorded during that month across the dataset.
Based on this history, Dubuque County earns a Reliability Grade of A, placing it in the 91st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Dubuque County's outage profile
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Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Dubuque County.
| County | Grade | National percentile |
|---|---|---|
| Muscatine County | A | 92nd |
| Adair County | A | 90th |
| Cass County | A | 89th |
| Marion County | A | 89th |
| Carroll County | A | 88th |
FAQ
How often does power go out in Dubuque County?
Between 2014 and 2025, Dubuque County recorded 307 outage events, averaging 1.6 hours each.
What is Dubuque County's reliability grade?
Dubuque County has a Reliability Grade of A, in the 91st national percentile.
What was the worst power outage in Dubuque County?
The worst outage on record started July 12, 2017 (Thunderstorm Wind), lasting 8 hours and affecting up to 9,599 customers.