Power Out Map
– 0% of Carroll out 0 customers out in Illinois

Power outage history

Carroll County Illinois

5.9hours

without power for the average customer in a typical year, 2018–2025

28th most of 101 in Illinois close to the national median

Worst outage on record Aug 10, 2020 65% of customers out · 90% back in 30 hours
Hours without power, average customer per year 5.9h / yr State average 2.9 h · national median 6.6 h
Major outages a year 2.8 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 4hours Median across major outages, from the peak
Longest single outage 2.0days Jul 15, 2024, over 1% of customers out
Outage hours on storm days 68% Share falling on days with a NOAA storm report here
Worst year 2020 18 hours without power, average customer
Electricity customers 7,336 ORNL customer model · 8 well-covered years

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 Carroll's customers who were without power at that day's worst moment.

20152016201720182019202020212022202320242025
0%100% of customers out

Year by year

Hours in the dark, per customer

2020 was the worst well-recorded year, at 18 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Carroll, hours without power per customer

CarrollUS median countyIllinois average
0 5 10 15 20 1.0 ’15 ’16 3.9 ’17 2.3 ’18 3.0 ’19 18 ’20 3.5 ’21 2.0 ’22 4.6 ’23 9.9 ’24 4.1 ’25 US 6.6 IL 2.9

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 4,732 65% 38 h 30 h 74k
Jul 15, 2024 Tornadoes 2,728 37% 2.0 d 13 h 54k
Nov 10, 2020 No storm report 2,657 36% 17 h 6.8 h 13k
Jan 11, 2020 Winter storm 901 12% 37 h 17 h 12k
Aug 12, 2020 No storm report 819 11% 38 h 5.2 h 11k
Sep 25, 2018 Thunderstorms 927 13% 27 h 26 h 10k
Jul 19, 2017 No storm report 503 7% 26 h 6.0 h 10k
Jul 10, 2025 Thunderstorms 1,543 21% 22 h 2.2 h 9.9k
Aug 10, 2021 Thunderstorms 2,679 37% 5.5 h 4.0 h 9.4k
Feb 12, 2019 Ice storm 586 8% 34 h 24 h 9.2k
Mar 7, 2017 No storm report 1,774 24% 30 h 17 h 9.0k
Nov 26, 2025 No storm report 2,240 31% 5.5 h 3.8 h 7.2k

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.

0% 25% 50% 75% 100% peak+24h+48h+72h+96h half back by +4h 90% by +14h

When it happens

The outage clock

Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.

00061218 Jan inside

What was happening

Weather behind the outages

Each outage is matched to NOAA storm reports for Carroll from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • Thunderstorms 39%
  • No storm on record 32%
  • Tornadoes 19%
  • Winter storm 5.8%
  • Ice storm 3.8%

Who keeps the lights on

Utilities serving Carroll

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
Jo-Carroll Energy, Inc Cooperative 138 37 0.54 20.5 17k

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

Across Illinois

Where it is darkest

Hours / yr64+

All Illinois 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 7,336 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 →