Power outage history
Clark County Ohio
2.3hours
without power for the average customer in a typical year, 2018–2025
81st most of 88 in Ohio 65% below the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of Clark's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2025 was the worst well-recorded year, at 4.2 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Clark, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Jun 18, 2025 | Thunderstorms | 17,465 | 21% | 46 h | 22 h | 183k |
| Sep 27, 2024 | Hurricane Helene | 8,093 | 10% | 29 h | 23 h | 88k |
| Aug 17, 2018 | No storm report | 9,047 | 11% | 5.2 h | 5.0 h | 37k |
| Feb 28, 2024 | Thunderstorms | 3,287 | 4% | 16 h | – | 29k |
| Oct 20, 2018 | No storm report | 5,245 | 6% | 12 h | 15 h | 27k |
| Apr 2, 2016 | No storm report | 12,614 | 15% | 3.8 h | 1.2 h | 21k |
| Nov 15, 2020 | No storm report | 5,096 | 6% | 12 h | 12 h | 20k |
| Oct 11, 2021 | No storm report | 9,468 | 11% | 4.2 h | 4.2 h | 19k |
| May 20, 2022 | No storm report | 16,019 | 19% | 2.0 h | 1.8 h | 18k |
| Apr 5, 2017 | Tornadoes | 3,714 | 4% | 7.5 h | – | 18k |
| Feb 7, 2019 | Tornadoes | 6,913 | 8% | 5.5 h | 1.8 h | 17k |
| Jun 8, 2022 | Tornadoes | 4,087 | 5% | 6.2 h | – | 16k |
| Dec 30, 2019 | Windstorm | 2,568 | 3% | 10 h | – | 16k |
| Sep 28, 2023 | No storm report | 2,961 | 4% | 4.8 h | – | 12k |
| Jan 10, 2016 | Winter storm | 2,531 | 3% | 7.2 h | – | 10k |
| Jul 29, 2023 | Thunderstorms | 3,066 | 4% | 7.5 h | – | 10k |
| Oct 3, 2019 | No storm report | 2,136 | 3% | 4.8 h | – | 10k |
| Aug 27, 2016 | No storm report | 3,616 | 4% | 4.8 h | – | 10k |
| Jul 19, 2015 | Thunderstorms | 4,810 | 6% | 3.0 h | 3.2 h | 10k |
| Nov 15, 2018 | Ice storm | 2,542 | 3% | 7.5 h | – | 9.8k |
| Oct 2, 2017 | No storm report | 3,306 | 4% | 3.5 h | – | 9.6k |
| Jul 25, 2025 | Thunderstorms | 4,402 | 5% | 3.0 h | 1.8 h | 9.6k |
| Dec 11, 2021 | No storm report | 5,541 | 7% | 1.8 h | 2.0 h | 9.4k |
| Mar 28, 2020 | Thunderstorms | 5,055 | 6% | 2.0 h | 1.0 h | 9.3k |
| Nov 5, 2017 | Flooding | 2,590 | 3% | 3.2 h | – | 8.4k |
| Nov 4, 2020 | No storm report | 6,682 | 8% | 1.8 h | 1.8 h | 7.9k |
| Feb 24, 2019 | No storm report | 4,959 | 6% | 3.2 h | 6.2 h | 7.8k |
| Apr 27, 2025 | No storm report | 2,210 | 3% | 3.5 h | – | 7.7k |
| Jul 25, 2021 | No storm report | 1,854 | 2% | 5.2 h | – | 7.7k |
| Aug 15, 2017 | No storm report | 3,295 | 4% | 2.5 h | – | 7.4k |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Clark from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 48%
- Thunderstorms 31%
- Tropical storm 10.0%
- Tornadoes 4.7%
- Windstorm 2.5%
- Winter storm 2.2%
- Ice storm 1.1%
- Flooding 0.9%
Who keeps the lights on
Utilities serving Clark
As each utility reports to the Energy Information Administration for its whole Ohio territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Ohio Edison Co | Investor Owned | 244 | 131 | 1.51 | 16.0 | 961k |
| Duke Energy Ohio Inc | Investor Owned | 178 | 108 | 1.01 | 16.8 | 700k |
| Dayton Power & Light Co | Investor Owned | 168 | 97 | 0.99 | 16.1 | 469k |
| Pioneer Rural Elec Coop, Inc | Cooperative | 129 | 129 | 1.50 | 16.4 | 16k |
| South Vienna Corporation | OH | – | – | – | – | 1.9k |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
Next door
Neighbouring counties
- Champaign 4.5 h
- Montgomery 3.8 h
- Greene 3.6 h
- Madison 3.0 h
- Miami 2.8 h
- Clark (this county) 2.3 h
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 83,871 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →