Mason County Power Outage History
2014–2025 · Michigan
Worse than average — more frequent or longer 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 |
|---|---|---|---|
| Aug 11, 2021 | 21 hrs | 11,073 (46%) | Thunderstorm Wind |
| Apr 20, 2017 | 7 hrs | 9,079 (38%) | Thunderstorm Wind |
| Aug 28, 2018 | 67 hrs | 7,525 (31%) | Thunderstorm Wind |
| Jul 28, 2023 | 8 hrs | 6,240 (26%) | Unnamed event |
| Jun 1, 2019 | 26 hrs | 5,195 (22%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Mason County recorded 551 distinct power outage events, averaging 3.5 hours per event.
The single worst outage on record in Mason County started August 11, 2021 (Thunderstorm Wind), lasting 21 hours and leaving up to 11,073 customers without power (46% of the county) at its peak.
October has historically been the worst month for outages in Mason County, with 64 events recorded during that month across the dataset.
Based on this history, Mason County earns a Reliability Grade of D, placing it in the 30th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Mason County's outage profile
See more picks in our Best Dual-Fuel Portable Generators for Power Outages roundup.
Champion Power Equipment 4375-Watt Dual Fuel RV Ready Portable Generator with Free 3-Year Warranty
Outage-prep kit
See our outage-prep guides or the Michigan storm prep checklist.
Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Mason County.
| County | Grade | National percentile |
|---|---|---|
| Manistee County | D | 30th |
| Muskegon County | D | 31st |
| Oceana County | D | 32nd |
| Iron County | D | 33rd |
| Benzie County | D | 28th |
FAQ
How often does power go out in Mason County?
Between 2014 and 2025, Mason County recorded 551 outage events, averaging 3.5 hours each.
What is Mason County's reliability grade?
Mason County has a Reliability Grade of D, in the 30th national percentile.
What was the worst power outage in Mason County?
The worst outage on record started August 11, 2021 (Thunderstorm Wind), lasting 21 hours and affecting up to 11,073 customers.