County annual report · FIPS 17031
2017 Cook County, IL Power Outage Report
In 2017, customers in Cook County, IL went without power for an average of 1.3 hours, a total of 2.8M customer-hours (Illinois average 1.4 hours). That ranks 44th worst of 102 Illinois counties and 1917th of 2,786 nationally.
Compared with IL, the US and 2016
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Cook County, 2017
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 17, 2017 18:45 | May 22, 2017 09:00 | 4d 14h | 22,361 | 240K |
| 2 | October 5, 2017 12:00 | October 17, 2017 07:30 | 11d 19h | 18,135 | 158K |
| 3 | March 8, 2017 12:30 | March 12, 2017 06:00 | 3d 17h | 16,053 | 162K |
| 4 | July 17, 2017 00:30 | August 7, 2017 06:30 | 21d 6h | 13,339 | 333K |
| 5 | July 5, 2017 09:30 | July 6, 2017 22:45 | 1d 13h | 12,945 | 31K |
| 6 | July 10, 2017 09:00 | July 16, 2017 23:30 | 6d 14h | 12,795 | 115K |
| 7 | June 2, 2017 11:15 | June 21, 2017 08:30 | 18d 21h | 7,773 | 211K |
| 8 | March 6, 2017 12:30 | March 8, 2017 09:30 | 1d 21h | 6,846 | 33K |
| 9 | December 4, 2017 13:00 | December 8, 2017 10:30 | 3d 21h | 5,774 | 138K |
| 10 | September 18, 2017 12:00 | September 25, 2017 08:00 | 6d 20h | 4,409 | 45K |
Outage episodes by size in 2017: 139 reached 100+ customers, 84 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 2017, 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 | 2017 | 1.6 hrs | 0.82 | 55 min | 0.66 |
| 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 n/a of Illinois's customers in 2017; 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, 2017, 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/2017/illinois/cook-county