Jefferson County Power Outage History
2014–2025 · Illinois
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Feb 16, 2021 | 5 hrs | 12,259 (54%) | Winter Weather |
| Jul 5, 2021 | 1 hrs | 6,853 (30%) | Unnamed event |
| Feb 14, 2018 | 2 hrs | 6,191 (27%) | Winter Weather |
| Aug 20, 2018 | 3 hrs | 6,056 (27%) | Unnamed event |
| Jun 29, 2018 | 15 hrs | 5,485 (24%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Jefferson County recorded 579 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Jefferson County started February 16, 2021 (Winter Weather), lasting 5 hours and leaving up to 12,259 customers without power (54% of the county) at its peak.
June has historically been the worst month for outages in Jefferson County, with 70 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of C, placing it in the 47th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Jefferson 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.
Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| Douglas County | C | 48th |
| Christian County | C | 48th |
| Shelby County | C | 46th |
| Lee County | C | 46th |
| Vermilion County | C | 46th |
FAQ
How often does power go out in Jefferson County?
Between 2014 and 2025, Jefferson County recorded 579 outage events, averaging 2.7 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of C, in the 47th national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started February 16, 2021 (Winter Weather), lasting 5 hours and affecting up to 12,259 customers.