County annual report · FIPS 17031
2024 Cook County, IL Power Outage Report
In 2024, customers in Cook County, IL went without power for an average of 2.7 hours, a total of 5.9M customer-hours (Illinois average 3.0 hours). That ranks 66th worst of 102 Illinois counties and 2182nd of 2,990 nationally.
Compared with IL, the US and 2023
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Cook County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 5, 2024 03:15 | August 11, 2024 08:30 | 37d 5h | 155,204 | 3.8M |
| 2 | January 8, 2024 13:15 | January 17, 2024 06:00 | 8d 16h | 73,699 | 447K |
| 3 | January 29, 2024 12:30 | January 31, 2024 12:15 | 1d 23h | 46,457 | 35K |
| 4 | August 27, 2024 11:15 | September 2, 2024 06:15 | 5d 19h | 25,860 | 375K |
| 5 | May 12, 2024 16:45 | May 24, 2024 00:15 | 11d 7h | 10,917 | 120K |
| 6 | December 4, 2024 12:45 | December 13, 2024 03:45 | 8d 15h | 10,411 | 56K |
| 7 | May 31, 2024 09:30 | June 26, 2024 08:00 | 25d 22h | 5,411 | 206K |
| 8 | February 26, 2024 14:30 | March 2, 2024 13:15 | 4d 22h | 5,291 | 41K |
| 9 | October 20, 2024 09:15 | October 28, 2024 10:30 | 8d 1h | 4,713 | 20K |
| 10 | September 20, 2024 14:15 | September 26, 2024 06:15 | 5d 16h | 3,614 | 30K |
Outage episodes by size in 2024: 110 reached 100+ customers, 45 reached 1,000+ customers, 6 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Cook County reported on EIA Form 861 for 2024, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Commonwealth Edison Co | 2024 | 2.2 hrs | 0.68 | 36 min | 0.49 |
| Northern Indiana Pub Serv Co | 2024 | 8.9 hrs | 1.34 | 2.8 hrs | 0.97 |
| University of Illinois | - | - | - | - | - |
| Village of Winnetka - (IL) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Illinois's customers in 2024; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,162,007 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Cook County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Cook County, IL annual power outage report, 2024, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2024/illinois/cook-county