Power outage history
Montgomery County Ohio
3.8hours
without power for the average customer in a typical year, 2018–2025
61st most of 88 in Ohio 42% 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 Montgomery's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2019 was the worst well-recorded year, at 11 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Montgomery, 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 |
|---|---|---|---|---|---|---|
| May 28, 2019 | Tornadoes | 45,385 | 15% | 6.5 d | 3.0 d | 2.6M |
| Sep 27, 2024 | Hurricane Helene | 62,412 | 21% | 3.6 d | 2.5 h | 1.7M |
| Jul 11, 2017 | Thunderstorms | 27,029 | 9% | 39 h | 37 h | 320k |
| Nov 15, 2018 | Ice storm | 19,756 | 7% | 34 h | 6.5 h | 243k |
| Jun 18, 2025 | Thunderstorms | 19,553 | 7% | 23 h | 23 h | 202k |
| Mar 25, 2023 | No storm report | 17,315 | 6% | 12 h | 7.8 h | 129k |
| Nov 15, 2020 | Windstorm | 14,722 | 5% | 17 h | 25 h | 120k |
| Jun 5, 2017 | Thunderstorms | 17,493 | 6% | 5.0 h | 4.8 h | 60k |
| Jun 13, 2022 | Thunderstorms | 10,237 | 3% | 5.8 h | 16 h | 43k |
| Apr 2, 2016 | No storm report | 12,769 | 4% | 9.5 h | 20 h | 42k |
| Nov 4, 2019 | No storm report | 19,670 | 7% | 3.0 h | 2.8 h | 40k |
| Aug 27, 2016 | Thunderstorms | 8,169 | 3% | 6.0 h | 18 h | 28k |
| Jan 19, 2023 | No storm report | 11,732 | 4% | 4.0 h | 4.5 h | 26k |
| Feb 24, 2019 | Windstorm | 5,488 | 2% | 5.2 h | 14 h | 21k |
| Jul 19, 2015 | Thunderstorms | 14,010 | 5% | 2.0 h | 2.0 h | 20k |
| Jul 19, 2020 | Thunderstorms | 5,953 | 2% | 3.8 h | 8.2 h | 20k |
| Jun 18, 2021 | Thunderstorms | 7,528 | 3% | 3.2 h | 15 h | 20k |
| Feb 28, 2024 | Thunderstorms | 6,109 | 2% | 5.8 h | 9.0 h | 19k |
| May 11, 2020 | No storm report | 10,877 | 4% | 2.0 h | 1.0 h | 19k |
| Aug 28, 2016 | Flooding | 6,494 | 2% | 4.2 h | 9.0 h | 19k |
| Jul 21, 2017 | Thunderstorms | 10,205 | 3% | 3.5 h | 7.2 h | 19k |
| Mar 26, 2021 | Windstorm | 4,704 | 2% | 5.8 h | – | 17k |
| Apr 29, 2025 | Thunderstorms | 7,658 | 3% | 3.8 h | 2.5 h | 17k |
| Jul 14, 2024 | Thunderstorms | 19,290 | 7% | 1.0 h | 12 min | 16k |
| Mar 31, 2022 | Windstorm | 6,960 | 2% | 2.8 h | 15 h | 16k |
| Oct 20, 2018 | No storm report | 9,523 | 3% | 4.2 h | 17 h | 16k |
| Jun 18, 2020 | No storm report | 10,752 | 4% | 1.8 h | 1.2 h | 15k |
| Jun 23, 2016 | Thunderstorms | 7,144 | 2% | 3.5 h | 1.8 h | 14k |
| Feb 2, 2022 | Winter storm | 8,015 | 3% | 2.0 h | 1.2 h | 14k |
| Feb 9, 2023 | No storm report | 6,618 | 2% | 2.8 h | 11 h | 13k |
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 Montgomery from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Tornadoes 45%
- Tropical storm 30%
- No storm on record 9.6%
- Thunderstorms 7.1%
- Ice storm 4.2%
- Windstorm 3.2%
Who keeps the lights on
Utilities serving Montgomery
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 |
|---|---|---|---|---|---|---|
| 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 |
| Butler Rural Electric Coop Inc | Cooperative | 172 | 103 | 1.59 | 18.4 | 12k |
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.
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 295,834 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 →