Iowa CountyPower Outage History
What this grade means
Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 10, 2020 | 177 hrs | 6,828 (80%) | Thunderstorm Wind |
| Dec 16, 2021 | 7 hrs | 6,623 (78%) | Unnamed event |
| May 3, 2021 | 1 hrs | 4,896 (57%) | Unnamed event |
| Aug 21, 2017 | 5 hrs | 4,655 (55%) | Unnamed event |
| Aug 4, 2016 | 22 hrs | 4,064 (48%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Iowa County, Iowa that day.
Over the 12 years from 2014 to 2025, Iowa County recorded 828 distinct power outage events, averaging 1.9 hours per event.
The single worst outage on record in Iowa County started August 10, 2020 (Thunderstorm Wind), lasting 177 hours and leaving up to 6,828 customers without power (80% of the county) at its peak.
May has historically been the worst month for outages in Iowa County, with 98 events recorded during that month across the dataset.
Based on this history, Iowa County earns a Reliability Grade of D, placing it in the 27th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Iowa County.
| County | Grade | National percentile |
|---|---|---|
| Clinton County | D | 23rd |
| Boone County | D | 32nd |
| Cedar County | D | 22nd |
| Monroe County | D | 21st |
| Greene County | D | 20th |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in Iowa County?
Between 2014 and 2025, Iowa County recorded 828 outage events, averaging 1.9 hours each.
What is Iowa County's reliability grade?
Iowa County has a Reliability Grade of D, in the 27th national percentile.
What was the worst power outage in Iowa County?
The worst outage on record started August 10, 2020 (Thunderstorm Wind), lasting 177 hours and affecting up to 6,828 customers.