Power outage history
St. Clair County Illinois
5.3hours
without power for the average customer in a typical year, 2018–2025
40th most of 101 in Illinois 19% 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 St. Clair's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2023 was the worst well-recorded year, at 12 hours for the average customer. Hatched years have a thin record and are left out of the averages.
St. Clair, 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 |
|---|---|---|---|---|---|---|
| Jul 13, 2016 | Thunderstorms | 40,861 | 43% | 2.4 d | 2.0 d | 1.0M |
| Jun 30, 2023 | Thunderstorms | 13,156 | 14% | 4.4 d | 3.8 d | 630k |
| Jun 28, 2018 | Thunderstorms | 28,750 | 30% | 2.6 d | 42 h | 538k |
| Mar 14, 2025 | Thunderstorms | 18,062 | 19% | 2.2 d | 1.2 h | 336k |
| Jul 29, 2023 | Thunderstorms | 8,463 | 9% | 37 h | 37 h | 159k |
| Jun 25, 2015 | Thunderstorms | 14,467 | 15% | 22 h | 16 h | 132k |
| Apr 15, 2023 | Tornadoes | 6,772 | 7% | 39 h | 35 h | 122k |
| Aug 10, 2020 | Flooding | 6,055 | 6% | 47 h | 10 h | 110k |
| Aug 12, 2021 | Thunderstorms | 5,221 | 6% | 18 h | 20 h | 51k |
| Jul 19, 2020 | No storm report | 5,269 | 6% | 14 h | 9.8 h | 43k |
| Jun 17, 2022 | Thunderstorms | 3,590 | 4% | 17 h | – | 38k |
| Feb 24, 2016 | No storm report | 7,977 | 8% | 7.8 h | 3.8 h | 36k |
| Jul 16, 2024 | No storm report | 4,529 | 5% | 16 h | – | 34k |
| May 26, 2024 | Tornadoes | 2,824 | 3% | 15 h | – | 33k |
| Apr 18, 2024 | Tornadoes | 2,334 | 2% | 21 h | – | 25k |
| Jun 13, 2016 | Tornadoes | 3,490 | 4% | 9.0 h | – | 22k |
| Aug 23, 2021 | Thunderstorms | 5,202 | 6% | 6.2 h | 6.8 h | 20k |
| Sep 20, 2025 | No storm report | 5,635 | 6% | 6.2 h | 8.5 h | 19k |
| May 19, 2022 | Thunderstorms | 4,775 | 5% | 7.0 h | 7.5 h | 17k |
| Jul 14, 2018 | Thunderstorms | 5,927 | 6% | 5.5 h | 5.5 h | 17k |
| May 16, 2025 | Thunderstorms | 2,764 | 3% | 16 h | – | 15k |
| Jul 8, 2020 | Thunderstorms | 2,035 | 2% | 10 h | – | 15k |
| Jan 1, 2018 | No storm report | 2,509 | 3% | 6.0 h | – | 14k |
| Mar 19, 2025 | No storm report | 6,641 | 7% | 3.0 h | 1.5 h | 14k |
| Jun 22, 2019 | No storm report | 5,379 | 6% | 3.2 h | 3.8 h | 14k |
| Jul 14, 2023 | Flooding | 2,170 | 2% | 7.2 h | – | 13k |
| May 7, 2016 | Thunderstorms | 3,097 | 3% | 5.5 h | – | 13k |
| Jun 1, 2019 | Thunderstorms | 2,417 | 3% | 9.0 h | – | 12k |
| Jul 10, 2021 | Thunderstorms | 2,027 | 2% | 8.0 h | – | 11k |
| Nov 15, 2018 | No storm report | 2,099 | 2% | 5.8 h | – | 11k |
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 St. Clair from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 71%
- No storm on record 16%
- Tornadoes 6.7%
- Flooding 4.9%
Who keeps the lights on
Utilities serving St. Clair
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 |
|---|---|---|---|---|---|---|
| Ameren Illinois Company | Investor Owned | 287 | 130 | 1.19 | 16.7 | 1.1M |
| Monroe County Elec Coop, Inc | IL | 209 | 209 | 1.44 | 14.4 | 103k |
| Clinton County Elec Coop, Inc | IL | – | – | – | 12.7 | 77k |
| City of Highland | IL | 35 | 30 | 0.40 | 11.9 | 68k |
| City of Mascoutah | IL | – | – | – | – | 36k |
| Southwestern Electric Coop Inc | Cooperative | 241 | 195 | 1.92 | 15.4 | 24k |
| Village of Freeburg | IL | – | – | – | – | 22k |
| Tri-County Electric Coop, Inc (IL) | Cooperative | 132 | 63 | 1.64 | 16.2 | 16k |
| Egyptian Electric Coop Assn | Cooperative | 773 | 24 | 4.62 | 16.2 | 14k |
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
- St. Louis, MO 25 h
- Washington 8.9 h
- Monroe 7.3 h
- St. Clair (this county) 5.3 h
- Clinton 5.0 h
- Madison 4.5 h
- Randolph 4.4 h
- St. Louis, MO 3.8 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 94,355 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 →