Mason County Power Outage History
2014–2025 · Illinois
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 |
|---|---|---|---|
| Jun 22, 2016 | 14 hrs | 2,621 (36%) | Thunderstorm Wind |
| Dec 14, 2023 | 1 hrs | 1,475 (20%) | Unnamed event |
| Jun 26, 2019 | 9 hrs | 1,166 (16%) | Unnamed event |
| Apr 22, 2015 | 2 hrs | 1,007 (14%) | Unnamed event |
| Jul 17, 2015 | 6 hrs | 994 (14%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Mason County recorded 268 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Mason County started June 22, 2016 (Thunderstorm Wind), lasting 14 hours and leaving up to 2,621 customers without power (36% of the county) at its peak.
June has historically been the worst month for outages in Mason County, with 36 events recorded during that month across the dataset.
Based on this history, Mason County earns a Reliability Grade of B, placing it in the 75th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Mason County's outage profile
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Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Mason County.
| County | Grade | National percentile |
|---|---|---|
| Macoupin County | B | 75th |
| Pulaski County | B | 75th |
| Union County | B | 76th |
| McDonough County | B | 76th |
| Jackson County | B | 74th |
FAQ
How often does power go out in Mason County?
Between 2014 and 2025, Mason County recorded 268 outage events, averaging 2.7 hours each.
What is Mason County's reliability grade?
Mason County has a Reliability Grade of B, in the 75th national percentile.
What was the worst power outage in Mason County?
The worst outage on record started June 22, 2016 (Thunderstorm Wind), lasting 14 hours and affecting up to 2,621 customers.