Milwaukee CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 10, 2023 | 47 hrs | 89,708 (15%) | Winter Storm |
| Aug 11, 2021 | <1 hr | 64,397 (11%) | Flash Flood |
| Aug 11, 2021 | 1 hrs | 63,517 (11%) | Flash Flood |
| Aug 11, 2021 | <1 hr | 63,268 (11%) | Flash Flood |
| Aug 11, 2021 | <1 hr | 62,675 (11%) | Flash Flood |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Milwaukee County, Wisconsin that day.
Over the 12 years from 2014 to 2025, Milwaukee County recorded 2,212 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Milwaukee County started March 10, 2023 (Winter Storm), lasting 47 hours and leaving up to 89,708 customers without power (15% of the county) at its peak.
July has historically been the worst month for outages in Milwaukee County, with 300 events recorded during that month across the dataset.
Based on this history, Milwaukee County earns a Reliability Grade of B, placing it in the 66th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Wisconsin
Counties with the closest reliability grade and national percentile to Milwaukee County.
| County | Grade | National percentile |
|---|---|---|
| Marathon County | B | 66th |
| Washburn County | B | 65th |
| Ashland County | B | 68th |
| Rusk County | B | 68th |
| Racine County | B | 64th |
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 Milwaukee County?
Between 2014 and 2025, Milwaukee County recorded 2,212 outage events, averaging 2.7 hours each.
What is Milwaukee County's reliability grade?
Milwaukee County has a Reliability Grade of B, in the 66th national percentile.
What was the worst power outage in Milwaukee County?
The worst outage on record started March 10, 2023 (Winter Storm), lasting 47 hours and affecting up to 89,708 customers.