Massac CountyPower Outage History
What this grade means
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
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 | <1 hr | 777 (10%) | Flood |
| May 5, 2017 | <1 hr | 776 (9%) | Flood |
| Dec 23, 2017 | <1 hr | 776 (9%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Massac County, Illinois that day.
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).
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 |
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 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.