Power outage history
Delaware County Ohio
5.9hours
without power for the average customer in a typical year, 2018–2025
41st most of 88 in Ohio close to 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 Delaware's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2020 was the worst well-recorded year, at 9.0 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Delaware, 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 |
|---|---|---|---|---|---|---|
| Mar 14, 2024 | Tornadoes | 11,308 | 18% | 24 h | 21 h | 162k |
| Sep 7, 2020 | Thunderstorms | 13,332 | 21% | 25 h | 22 h | 127k |
| Jun 10, 2020 | Thunderstorms | 12,875 | 20% | 21 h | 19 h | 92k |
| Jun 13, 2022 | Thunderstorms | 14,334 | 22% | 11 h | 8.2 h | 79k |
| Mar 22, 2024 | No storm report | 972 | 2% | 2.9 d | – | 67k |
| Apr 21, 2021 | Winter storm | 8,795 | 14% | 8.5 h | 7.8 h | 56k |
| Dec 15, 2019 | Winter storm | 3,939 | 6% | 13 h | 18 h | 49k |
| Nov 27, 2019 | No storm report | 4,652 | 7% | 19 h | 18 h | 48k |
| Jul 6, 2022 | Thunderstorms | 4,943 | 8% | 15 h | 14 h | 48k |
| Feb 24, 2019 | No storm report | 2,530 | 4% | 27 h | – | 48k |
| Jul 6, 2020 | No storm report | 3,751 | 6% | 16 h | 14 h | 44k |
| Jul 23, 2022 | Thunderstorms | 4,941 | 8% | 16 h | 13 h | 40k |
| Mar 25, 2023 | Windstorm | 3,573 | 6% | 22 h | 18 h | 32k |
| Jul 2, 2019 | Thunderstorms | 3,102 | 5% | 14 h | – | 28k |
| Dec 13, 2023 | No storm report | 3,682 | 6% | 8.0 h | 8.0 h | 26k |
| Aug 28, 2020 | Thunderstorms | 5,312 | 8% | 8.5 h | 3.2 h | 26k |
| Mar 19, 2017 | No storm report | 7,732 | 12% | 5.2 h | 3.2 h | 24k |
| Jun 15, 2016 | Flooding | 4,956 | 8% | 6.5 h | 6.0 h | 22k |
| Dec 30, 2019 | Windstorm | 8,838 | 14% | 5.0 h | 2.8 h | 21k |
| Jun 28, 2021 | No storm report | 7,719 | 12% | 2.8 h | 9.5 h | 20k |
| Dec 27, 2016 | No storm report | 4,930 | 8% | 3.5 h | 3.5 h | 17k |
| Mar 5, 2017 | No storm report | 3,508 | 5% | 4.5 h | 5.5 h | 16k |
| Jan 10, 2017 | No storm report | 8,324 | 13% | 2.0 h | 30 min | 16k |
| Oct 16, 2020 | No storm report | 4,989 | 8% | 3.2 h | 5.0 h | 16k |
| Jan 11, 2020 | No storm report | 3,570 | 6% | 7.2 h | 4.8 h | 15k |
| Sep 6, 2017 | No storm report | 2,761 | 4% | 11 h | – | 15k |
| May 3, 2019 | No storm report | 1,760 | 3% | 8.2 h | – | 15k |
| May 8, 2016 | No storm report | 4,338 | 7% | 9.2 h | 6.2 h | 14k |
| Jun 8, 2019 | No storm report | 1,859 | 3% | 7.8 h | – | 14k |
| Feb 3, 2016 | No storm report | 900 | 1% | 19 h | – | 14k |
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 Delaware from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 59%
- Thunderstorms 24%
- Tornadoes 7.6%
- Winter storm 5.3%
- Windstorm 2.9%
Who keeps the lights on
Utilities serving Delaware
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 Power Co | Investor Owned | 221 | 145 | 1.22 | 19.0 | 1.3M |
| 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 |
| Licking Rural Electric Inc | Cooperative | 244 | 112 | 1.57 | 17.0 | 26k |
| Consolidated Cooperative | Cooperative | 162 | 109 | 1.99 | 17.0 | 17k |
| City of Westerville | Municipal | 25 | 25 | 0.29 | 14.5 | 16k |
| Union Rural Electric Coop, Inc | Cooperative | 184 | 62 | 2.12 | 16.8 | 12k |
| Prospect Corporation | OH | – | – | – | – | 6.9k |
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.
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 64,488 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 →