Power outage history
DuPage County Illinois
2.7hours
without power for the average customer in a typical year, 2018–2025
78th most of 101 in Illinois 59% 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 DuPage'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 6.7 hours for the average customer. Hatched years have a thin record and are left out of the averages.
DuPage, 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 | 64,595 | 21% | 3.1 d | 2.1 d | 1.8M |
| Nov 25, 2018 | Winter storm | 27,278 | 9% | 2.0 d | 32 h | 710k |
| Jul 15, 2024 | Thunderstorms | 17,064 | 5% | 20 h | 29 h | 182k |
| Jun 20, 2021 | Thunderstorms | 15,340 | 5% | 19 h | 22 h | 168k |
| Aug 8, 2025 | No storm report | 20,530 | 7% | 7.2 h | 7.0 h | 125k |
| Jul 24, 2025 | Thunderstorms | 12,042 | 4% | 16 h | 20 h | 110k |
| Aug 17, 2025 | Thunderstorms | 14,386 | 5% | 16 h | 19 h | 107k |
| Jul 14, 2023 | Thunderstorms | 14,334 | 5% | 16 h | 17 h | 95k |
| Jun 30, 2019 | Thunderstorms | 14,644 | 5% | 8.8 h | 11 h | 84k |
| Aug 28, 2018 | Thunderstorms | 13,204 | 4% | 12 h | 14 h | 76k |
| Jul 23, 2017 | Thunderstorms | 14,475 | 5% | 6.0 h | 8.5 h | 57k |
| Jul 21, 2017 | Thunderstorms | 6,612 | 2% | 10 h | 21 h | 51k |
| Jun 22, 2024 | Thunderstorms | 5,951 | 2% | 12 h | 15 h | 50k |
| Aug 11, 2021 | Thunderstorms | 10,774 | 3% | 9.5 h | 14 h | 47k |
| Aug 10, 2021 | Thunderstorms | 8,194 | 3% | 10 h | 21 h | 44k |
| Jan 12, 2024 | Winter storm | 9,201 | 3% | 6.2 h | 6.0 h | 44k |
| Oct 30, 2019 | No storm report | 10,103 | 3% | 6.2 h | 8.0 h | 42k |
| Feb 19, 2016 | Windstorm | 7,833 | 3% | 7.8 h | 14 h | 40k |
| Jun 13, 2022 | Thunderstorms | 9,156 | 3% | 5.8 h | 16 h | 28k |
| Dec 9, 2019 | No storm report | 13,268 | 4% | 1.5 h | 1.0 h | 17k |
| Aug 18, 2019 | Thunderstorms | 6,545 | 2% | 3.0 h | 6.8 h | 17k |
| Jul 16, 2025 | Thunderstorms | 7,780 | 2% | 2.8 h | 6.2 h | 16k |
| Jul 29, 2023 | Thunderstorms | 6,345 | 2% | 2.2 h | 11 h | 12k |
| Jul 29, 2021 | Thunderstorms | 6,050 | 2% | 3.0 h | 9.2 h | 12k |
| Mar 9, 2015 | No storm report | 9,976 | 3% | 2.0 h | 48 min | 11k |
| May 25, 2016 | Thunderstorms | 5,448 | 2% | 2.5 h | 5.5 h | 11k |
| Jun 14, 2022 | Heat | 4,577 | 1% | 2.2 h | – | 9.8k |
| Oct 20, 2018 | Windstorm | 5,569 | 2% | 3.5 h | 5.5 h | 9.5k |
| May 22, 2024 | Windstorm | 4,428 | 1% | 2.2 h | – | 8.4k |
| Jun 29, 2020 | No storm report | 8,311 | 3% | 48 min | 1.0 h | 6.2k |
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 DuPage from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 74%
- Winter storm 20%
- No storm on record 5.5%
- Windstorm 0.5%
Who keeps the lights on
Utilities serving DuPage
As each utility reports to the Energy Information Administration for its whole Illinois territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Commonwealth Edison Co | Investor Owned | 77 | 38 | 0.66 | 17.7 | 3.8M |
| City of Naperville | Municipal | 20 | – | 0.27 | 14.6 | 57k |
| City of St Charles | Municipal | 46 | 2 | 0.27 | 14.6 | 15k |
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
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 313,751 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 →