Power outage history
Hamilton County Indiana
2.2hours
without power for the average customer in a typical year, 2018–2025
69th most of 90 in Indiana 67% 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 Hamilton'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 3.2 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Hamilton, 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 |
|---|---|---|---|---|---|---|
| Apr 8, 2020 | Thunderstorms | 25,996 | 16% | 16 h | 14 h | 244k |
| May 16, 2019 | Thunderstorms | 20,197 | 13% | 25 h | 21 h | 162k |
| Apr 2, 2025 | Tornadoes | 11,997 | 8% | 16 h | 14 h | 84k |
| Jun 18, 2025 | Thunderstorms | 11,964 | 8% | 19 h | 25 h | 83k |
| May 16, 2025 | Thunderstorms | 13,369 | 8% | 8.5 h | 7.2 h | 64k |
| Apr 2, 2016 | Windstorm | 10,895 | 7% | 19 h | 18 h | 61k |
| Sep 27, 2024 | Hurricane Helene | 17,791 | 11% | 18 h | 11 h | 46k |
| Jun 21, 2015 | Tropical Storm Bill | 7,325 | 5% | 14 h | 17 h | 43k |
| Oct 20, 2018 | No storm report | 7,772 | 5% | 9.5 h | 8.0 h | 41k |
| Aug 16, 2025 | Thunderstorms | 7,417 | 5% | 6.2 h | 7.5 h | 37k |
| Jun 29, 2023 | Thunderstorms | 3,294 | 2% | 12 h | – | 27k |
| Jul 7, 2017 | Thunderstorms | 10,760 | 7% | 4.5 h | 4.2 h | 24k |
| Jun 19, 2021 | Thunderstorms | 3,362 | 2% | 6.5 h | – | 22k |
| Aug 5, 2016 | No storm report | 5,681 | 4% | 4.5 h | 3.2 h | 21k |
| Jul 11, 2017 | Thunderstorms | 3,596 | 2% | 7.8 h | – | 20k |
| Feb 17, 2019 | No storm report | 5,973 | 4% | 3.5 h | 3.8 h | 19k |
| Aug 29, 2021 | Thunderstorms | 6,000 | 4% | 5.2 h | 5.5 h | 18k |
| Jan 26, 2020 | No storm report | 4,975 | 3% | 3.8 h | – | 18k |
| Jul 21, 2017 | No storm report | 6,193 | 4% | 4.8 h | 3.8 h | 17k |
| Jul 16, 2024 | Thunderstorms | 8,108 | 5% | 3.0 h | 3.0 h | 17k |
| May 8, 2025 | No storm report | 5,037 | 3% | 3.2 h | 4.5 h | 16k |
| Dec 12, 2024 | No storm report | 4,466 | 3% | 4.5 h | – | 16k |
| Jul 25, 2022 | No storm report | 2,827 | 2% | 6.2 h | – | 16k |
| Mar 19, 2025 | No storm report | 2,610 | 2% | 5.8 h | – | 15k |
| Jan 30, 2019 | No storm report | 5,253 | 3% | 4.0 h | 4.5 h | 15k |
| Jun 23, 2016 | No storm report | 3,486 | 2% | 5.2 h | – | 13k |
| May 2, 2019 | No storm report | 3,750 | 2% | 4.5 h | – | 13k |
| Jul 8, 2022 | No storm report | 3,058 | 2% | 4.8 h | – | 12k |
| Jan 2, 2015 | No storm report | 11,544 | 7% | 2.8 h | 1.8 h | 12k |
| Apr 19, 2015 | No storm report | 3,706 | 2% | 3.2 h | – | 12k |
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 Hamilton from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 46%
- No storm on record 43%
- Tornadoes 5.3%
- Tropical storm 3.7%
- Windstorm 1.0%
- Winter storm 0.6%
Who keeps the lights on
Utilities serving Hamilton
As each utility reports to the Energy Information Administration for its whole Indiana 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 Indiana, LLC | Investor Owned | 267 | 108 | 1.26 | 15.0 | 809k |
| AES Indiana | Investor Owned | 295 | 76 | 1.22 | 14.7 | 470k |
| Indiana Michigan Power Co | Investor Owned | 283 | 83 | 0.97 | 17.2 | 425k |
| Boone County Rural EMC | Cooperative | 147 | 147 | 1.54 | 15.8 | 19k |
| NineStar Connect | Cooperative | 193 | 98 | 1.65 | 16.5 | 19k |
| City of Frankfort | Municipal | – | – | – | 11.3 | 7.9k |
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 159,187 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 →