Massac County Power Outage History
2015–2025 · Illinois
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 21, 2019 | 18 hrs | 1,312 (16%) | Thunderstorm Wind |
| Jun 12, 2015 | 1 hrs | 787 (10%) | Unnamed event |
| May 6, 2015 | 0 hrs | 777 (10%) | Flood |
| May 5, 2017 | 1 hrs | 776 (9%) | Flood |
| Dec 23, 2017 | 1 hrs | 776 (9%) | Unnamed event |
Over the 11 years from 2015 to 2025, Massac County recorded 69 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Massac County started June 21, 2019 (Thunderstorm Wind), lasting 18 hours and leaving up to 1,312 customers without power (16% of the county) at its peak.
May has historically been the worst month for outages in Massac County, with 12 events recorded during that month across the dataset.
Based on this history, Massac County earns a Reliability Grade of A, placing it in the 94th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Massac County's outage profile
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Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Massac County.
| County | Grade | National percentile |
|---|---|---|
| Kendall County | A | 93rd |
| Cass County | A | 92nd |
| Lake County | A | 92nd |
| Clay County | A | 91st |
| Edwards County | A | 91st |
FAQ
How often does power go out in Massac County?
Between 2015 and 2025, Massac County recorded 69 outage events, averaging 2.0 hours each.
What is Massac County's reliability grade?
Massac County has a Reliability Grade of A, in the 94th national percentile.
What was the worst power outage in Massac County?
The worst outage on record started June 21, 2019 (Thunderstorm Wind), lasting 18 hours and affecting up to 1,312 customers.