Power outage history
Jasper County Iowa
18hours
without power for the average customer in a typical year, 2018–2025
4th most of 98 in Iowa 2.7× 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 Jasper'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 4.6 days for the average customer. Hatched years have a thin record and are left out of the averages.
Jasper, 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 |
|---|---|---|---|---|---|---|
| Aug 10, 2020 | Thunderstorms | 14,954 | 96% | 10.0 d | 8.0 d | 1.7M |
| May 24, 2024 | Thunderstorms | 4,736 | 30% | 30 h | 28 h | 48k |
| May 21, 2024 | Thunderstorms | 7,059 | 45% | 16 h | 3.5 h | 48k |
| Dec 15, 2021 | Tornadoes | 6,920 | 44% | 44 h | 16 h | 47k |
| Mar 14, 2025 | Thunderstorms | 3,425 | 22% | 8.8 h | 5.5 h | 21k |
| Mar 12, 2019 | No storm report | 2,770 | 18% | 7.0 h | 5.8 h | 14k |
| Mar 5, 2022 | Tornadoes | 1,822 | 12% | 11 h | 8.2 h | 9.7k |
| Sep 25, 2017 | No storm report | 2,717 | 17% | 6.2 h | 4.5 h | 9.5k |
| May 13, 2018 | Thunderstorms | 309 | 2% | 34 h | – | 7.0k |
| Sep 17, 2023 | No storm report | 3,310 | 21% | 2.0 h | 5.2 h | 6.6k |
| Aug 27, 2019 | No storm report | 3,286 | 21% | 2.2 h | 1.5 h | 6.5k |
| Jul 14, 2021 | Thunderstorms | 2,317 | 15% | 3.8 h | 1.2 h | 6.5k |
| Jul 11, 2025 | No storm report | 1,700 | 11% | 3.8 h | 1.8 h | 6.3k |
| Sep 16, 2017 | No storm report | 1,286 | 8% | 4.5 h | 4.0 h | 5.7k |
| May 17, 2017 | Thunderstorms | 730 | 5% | 11 h | – | 5.7k |
| Jul 20, 2025 | No storm report | 1,622 | 10% | 4.2 h | 4.0 h | 5.5k |
| Jul 15, 2024 | Thunderstorms | 2,646 | 17% | 3.8 h | 1.8 h | 4.9k |
| Apr 15, 2025 | No storm report | 3,226 | 21% | 5.8 h | 5.8 h | 4.6k |
| May 7, 2023 | Thunderstorms | 1,216 | 8% | 4.0 h | 2.8 h | 4.1k |
| Jul 8, 2024 | No storm report | 2,500 | 16% | 5.2 h | 1.8 h | 4.1k |
| Feb 1, 2015 | Winter storm | 1,289 | 8% | 5.5 h | 3.8 h | 4.1k |
| Mar 17, 2020 | No storm report | 1,092 | 7% | 11 h | 11 h | 4.1k |
| Sep 11, 2019 | No storm report | 1,992 | 13% | 2.8 h | 3.0 h | 3.9k |
| Sep 19, 2025 | No storm report | 1,357 | 9% | 3.0 h | 30 min | 3.9k |
| Jan 18, 2020 | Winter storm | 1,236 | 8% | 5.8 h | 2.2 h | 3.8k |
| Sep 18, 2018 | Thunderstorms | 1,490 | 10% | 6.0 h | 30 min | 3.6k |
| Jun 6, 2018 | Thunderstorms | 1,521 | 10% | 4.8 h | 3.2 h | 3.5k |
| Sep 19, 2024 | Thunderstorms | 1,606 | 10% | 2.5 h | 2.0 h | 3.4k |
| Jun 13, 2023 | No storm report | 3,277 | 21% | 1.0 h | 1.0 h | 3.3k |
| May 25, 2020 | Thunderstorms | 1,331 | 9% | 6.5 h | 6.2 h | 3.2k |
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 Jasper from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 88%
- No storm on record 8.3%
- Tornadoes 2.8%
Who keeps the lights on
Utilities serving Jasper
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 |
|---|---|---|---|---|---|---|
| MidAmerican Energy Co | Investor Owned | 205 | 82 | 1.19 | 11.2 | 640k |
| Interstate Power and Light Co | Investor Owned | 89 | 74 | 0.82 | 17.8 | 419k |
| Pella Cooperative Elec Assn | IA | – | – | – | 13.0 | 40k |
| Consumers Energy Coop | Cooperative | 94 | 94 | 0.74 | 14.8 | 7.1k |
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.
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 15,566 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 →