Chester CountyPower Outage History
2017–2025 · Tennessee
Average — typical outage frequency and duration nationally.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 15, 2025 | 7 hrs | 5,313 (87%) | Unnamed event |
| Aug 22, 2023 | <1 hr | 4,415 (72%) | Heat |
| Aug 18, 2021 | <1 hr | 4,411 (72%) | Heat |
| May 5, 2022 | <1 hr | 4,411 (72%) | Hail |
| Jun 11, 2017 | 4 hrs | 4,047 (66%) | Unnamed event |
Over the 9 years from 2017 to 2025, Chester County recorded 495 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Chester County started March 15, 2025, lasting 7 hours and leaving up to 5,313 customers without power (87% of the county) at its peak.
May has historically been the worst month for outages in Chester County, with 63 events recorded during that month across the dataset.
Based on this history, Chester County earns a Reliability Grade of C, placing it in the 40th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Chester County.
| County | Grade | National percentile |
|---|---|---|
| Hawkins County | C | 41st |
| Moore County | D | 39th |
| Monroe County | C | 43rd |
| Crockett County | C | 43rd |
| Grundy County | D | 37th |
Most reliable counties in Tennessee
The top 3 counties in Tennessee by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Lincoln County | A | 99th |
| Jackson County | A | 99th |
| Scott County | A | 98th |
Least reliable counties in Tennessee
The bottom 3 counties in Tennessee by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Shelby County | F | 8th |
| Sevier County | D | 20th |
| Stewart County | D | 21st |
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 Chester County?
Between 2017 and 2025, Chester County recorded 495 outage events, averaging 2.0 hours each.
What is Chester County's reliability grade?
Chester County has a Reliability Grade of C, in the 40th national percentile.
What was the worst power outage in Chester County?
The worst outage on record started March 15, 2025, lasting 7 hours and affecting up to 5,313 customers.