Power outage history
Massac County Illinois
0.8hours
without power for the average customer in a typical year, 2018–2025
100th most of 101 in Illinois 88% 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 Massac's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2019 was the worst well-recorded year, at 1.7 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Massac, 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 |
|---|---|---|---|---|---|---|
| Jun 21, 2019 | Thunderstorms | 1,312 | 16% | 18 h | 13 h | 10k |
| Jun 13, 2021 | No storm report | 651 | 8% | 7.2 h | 7.5 h | 4.5k |
| Apr 14, 2018 | Flooding | 664 | 8% | 7.2 h | 6.2 h | 4.5k |
| Jun 28, 2018 | Thunderstorms | 731 | 9% | 9.8 h | 4.8 h | 3.9k |
| Jul 28, 2025 | Heat | 728 | 9% | 3.2 h | 30 min | 2.4k |
| Apr 24, 2017 | No storm report | 775 | 9% | 2.8 h | 2.5 h | 2.1k |
| Jul 25, 2018 | No storm report | 659 | 8% | 3.0 h | 3.0 h | 2.0k |
| May 8, 2024 | Thunderstorms | 169 | 2% | 7.5 h | – | 1.3k |
| Aug 18, 2016 | No storm report | 670 | 8% | 2.2 h | 12 min | 1.1k |
| Jun 23, 2019 | Thunderstorms | 488 | 6% | 2.5 h | 1.8 h | 944 |
| Nov 5, 2017 | No storm report | 771 | 9% | 1.2 h | 1.0 h | 811 |
| Mar 1, 2017 | Thunderstorms | 172 | 2% | 4.8 h | – | 793 |
| Jun 11, 2015 | No storm report | 787 | 10% | 1.0 h | 48 min | 787 |
| Feb 28, 2017 | No storm report | 334 | 4% | 3.8 h | – | 750 |
| Oct 17, 2016 | No storm report | 328 | 4% | 2.2 h | – | 737 |
| Jul 8, 2016 | No storm report | 130 | 2% | 5.5 h | – | 705 |
| Apr 7, 2023 | No storm report | 313 | 4% | 2.2 h | – | 704 |
| Oct 15, 2025 | No storm report | 606 | 7% | 1.2 h | 1.0 h | 679 |
| Jun 1, 2021 | No storm report | 754 | 9% | 1.0 h | 1.8 h | 650 |
| Nov 18, 2017 | Tornadoes | 108 | 1% | 5.5 h | – | 589 |
| Mar 25, 2021 | Windstorm | 756 | 9% | 48 min | 48 min | 567 |
| Sep 12, 2019 | No storm report | 746 | 9% | 48 min | 1.2 h | 560 |
| Jul 24, 2023 | No storm report | 447 | 5% | 1.5 h | 48 min | 525 |
| Aug 18, 2023 | No storm report | 611 | 7% | 48 min | 48 min | 458 |
| Dec 22, 2017 | No storm report | 776 | 9% | 48 min | 30 min | 440 |
| Aug 20, 2019 | Thunderstorms | 301 | 4% | 2.0 h | – | 427 |
| Oct 25, 2016 | No storm report | 328 | 4% | 1.2 h | – | 409 |
| Oct 12, 2021 | No storm report | 143 | 2% | 3.0 h | – | 401 |
| Apr 6, 2022 | No storm report | 319 | 4% | 1.2 h | – | 398 |
| May 5, 2017 | Windstorm | 776 | 9% | 30 min | 12 min | 388 |
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 Massac from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 43%
- No storm on record 37%
- Flooding 11%
- Heat 6.0%
- Windstorm 2.0%
Who keeps the lights on
Utilities serving Massac
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 |
| Southern Illinois Elec Coop | IL | 228 | 105 | – | 15.3 | 152k |
| City of Metropolis | IL | – | – | – | – | 46k |
| Southeastern IL Elec Coop, Inc | Cooperative | 2,214 | 172 | 3.95 | 14.8 | 23k |
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
- Pope 7.9 h
- Livingston, KY 5.6 h
- Johnson 4.9 h
- Pulaski 3.1 h
- McCracken, KY 2.5 h
- Massac (this county) 0.8 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 8,175 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 →