Milwaukee County Power Outage History
2014–2025 · Wisconsin
Better than average — fewer or shorter outages than most counties. How grades are calculated
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 hrs | 64,397 (11%) | Flash Flood |
| Aug 11, 2021 | 1 hrs | 63,517 (11%) | Flash Flood |
| Aug 11, 2021 | 0 hrs | 63,268 (11%) | Flash Flood |
| Aug 11, 2021 | 0 hrs | 62,675 (11%) | Flash Flood |
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).
Sized for Milwaukee County's outage profile
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Outage-prep kit
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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 |
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.