Power outage history
Davis County Iowa
1.6hours
without power for the average customer in a typical year, 2018–2025
85th most of 98 in Iowa 75% 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 Davis's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2024 was the worst well-recorded year, at 2.5 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Davis, 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 |
|---|---|---|---|---|---|---|
| Dec 15, 2021 | Windstorm | 563 | 12% | 22 h | 21 h | 3.6k |
| Mar 31, 2023 | No storm report | 293 | 6% | 15 h | 14 h | 3.0k |
| Feb 4, 2017 | No storm report | 54 | 1% | 2.2 d | – | 2.9k |
| Feb 12, 2017 | No storm report | 101 | 2% | 28 h | – | 2.9k |
| Jun 29, 2023 | Thunderstorms | 340 | 7% | 8.8 h | 6.0 h | 1.8k |
| Nov 29, 2015 | No storm report | 287 | 6% | 6.5 h | 6.2 h | 1.8k |
| Nov 21, 2015 | No storm report | 362 | 8% | 5.2 h | 3.8 h | 1.8k |
| May 4, 2024 | No storm report | 544 | 12% | 3.2 h | 3.2 h | 1.8k |
| Mar 6, 2017 | No storm report | 316 | 7% | 9.2 h | 8.8 h | 1.7k |
| Dec 19, 2015 | No storm report | 208 | 4% | 7.8 h | – | 1.5k |
| Aug 28, 2018 | Thunderstorms | 229 | 5% | 12 h | – | 1.5k |
| Sep 18, 2024 | No storm report | 101 | 2% | 17 h | – | 1.5k |
| Jan 13, 2020 | No storm report | 213 | 5% | 5.2 h | – | 1.1k |
| Jun 27, 2019 | No storm report | 179 | 4% | 6.0 h | – | 1.1k |
| Sep 21, 2023 | No storm report | 93 | 2% | 11 h | – | 1.0k |
| Dec 14, 2024 | Ice storm | 233 | 5% | 7.5 h | – | 992 |
| Jan 9, 2024 | Winter storm | 130 | 3% | 11 h | – | 927 |
| Jun 22, 2015 | Thunderstorms | 187 | 4% | 6.8 h | – | 916 |
| Sep 29, 2019 | Flooding | 136 | 3% | 11 h | – | 859 |
| Mar 4, 2023 | No storm report | 437 | 9% | 2.5 h | 1.2 h | 828 |
| May 26, 2022 | No storm report | 205 | 4% | 4.0 h | – | 820 |
| Jun 19, 2021 | Thunderstorms | 203 | 4% | 3.8 h | – | 725 |
| Jun 28, 2019 | Thunderstorms | 207 | 4% | 4.5 h | – | 703 |
| Jan 10, 2020 | No storm report | 183 | 4% | 6.0 h | – | 585 |
| Jul 3, 2019 | No storm report | 179 | 4% | 3.2 h | – | 582 |
| Apr 23, 2019 | No storm report | 67 | 1% | 8.2 h | – | 553 |
| Oct 20, 2022 | No storm report | 176 | 4% | 5.5 h | – | 530 |
| Jul 31, 2024 | Thunderstorms | 222 | 5% | 4.2 h | – | 527 |
| Jun 11, 2020 | No storm report | 207 | 4% | 2.5 h | – | 518 |
| Jul 24, 2015 | Thunderstorms | 188 | 4% | 2.8 h | – | 505 |
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 Davis from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 67%
- Thunderstorms 15%
- Windstorm 8.6%
- Flooding 3.2%
- Winter storm 2.6%
- Ice storm 2.4%
- Heat 0.6%
Who keeps the lights on
Utilities serving Davis
As each utility reports to the Energy Information Administration for its whole Iowa territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Interstate Power and Light Co | Investor Owned | 89 | 74 | 0.82 | 17.8 | 419k |
| Southern Iowa Elec Coop, Inc | IA | 177 | 177 | 1.66 | 15.7 | 61k |
| Chariton Valley Elec Coop, Inc | IA | 204 | 161 | 1.99 | 13.2 | 58k |
| Access Energy Coop | Cooperative | 83 | 83 | 0.77 | 14.8 | 8.9k |
| City of Bloomfield | Municipal | – | – | – | 13.0 | 1.1k |
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
- Monroe 12 h
- Schuyler, MO 5.6 h
- Scotland, MO 5.6 h
- Appanoose 5.5 h
- Van Buren 5.2 h
- Jefferson 4.0 h
- Wapello 2.1 h
- Davis (this county) 1.6 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 4,718 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 →