County annual report · FIPS 17031
2019 Cook County, IL Power Outage Report
In 2019, customers in Cook County, IL went without power for an average of 1.2 hours, a total of 2.5M customer-hours (Illinois average 1.8 hours). That ranks 89th worst of 102 Illinois counties and 2429th of 2,945 nationally.
Compared with IL, the US and 2018
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Cook County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 23, 2019 09:30 | July 5, 2019 08:00 | 11d 22h | 14,682 | 245K |
| 2 | August 11, 2019 09:00 | August 19, 2019 10:00 | 8d 1h | 12,329 | 109K |
| 3 | November 26, 2019 09:00 | November 29, 2019 03:00 | 2d 18h | 12,117 | 101K |
| 4 | January 29, 2019 12:30 | February 4, 2019 07:00 | 5d 18h | 10,540 | 90K |
| 5 | May 27, 2019 08:00 | June 7, 2019 07:30 | 10d 23h | 9,994 | 126K |
| 6 | October 28, 2019 11:45 | November 7, 2019 09:30 | 9d 21h | 9,557 | 119K |
| 7 | September 3, 2019 10:00 | September 6, 2019 10:30 | 3d | 7,459 | 39K |
| 8 | February 10, 2019 09:00 | February 17, 2019 05:00 | 6d 20h | 7,335 | 80K |
| 9 | February 23, 2019 10:30 | February 26, 2019 11:30 | 3d 1h | 6,830 | 79K |
| 10 | October 21, 2019 12:00 | October 24, 2019 06:15 | 2d 18h | 6,685 | 41K |
Outage episodes by size in 2019: 136 reached 100+ customers, 80 reached 1,000+ customers, 4 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 2019, 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 | 2018 | 2.0 hrs | 0.82 | 58 min | 0.70 |
| Northern Indiana Pub Serv Co | - | - | - | - | - |
| 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 99% of Illinois's customers in 2019; 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, 2019, 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/2019/illinois/cook-county