County annual report · FIPS 17031
2016 Cook County, IL Power Outage Report
In 2016, customers in Cook County, IL went without power for an average of 1.1 hours, a total of 2.3M customer-hours (Illinois average 1.5 hours). That ranks 70th worst of 100 Illinois counties and 1730th of 2,391 nationally.
Compared with IL, the US and 2015
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Cook County, 2016
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | February 19, 2016 10:30 | February 22, 2016 10:00 | 2d 23h | 95,661 | 964K |
| 2 | February 24, 2016 10:00 | February 26, 2016 11:30 | 2d 1h | 12,867 | 104K |
| 3 | March 15, 2016 10:30 | March 18, 2016 11:00 | 3d | 12,280 | 95K |
| 4 | May 21, 2016 10:00 | June 8, 2016 10:00 | 18d | 7,375 | 187K |
| 5 | June 22, 2016 03:00 | June 23, 2016 10:00 | 1d 7h | 6,559 | 32K |
| 6 | April 2, 2016 11:30 | April 8, 2016 02:30 | 5d 15h | 4,962 | 48K |
| 7 | January 29, 2016 11:30 | February 1, 2016 08:30 | 2d 21h | 4,209 | 15K |
| 8 | March 12, 2016 19:15 | March 13, 2016 06:00 | 10h 45m | 3,758 | 9,496 |
| 9 | January 8, 2016 13:30 | January 14, 2016 09:00 | 5d 19h | 3,582 | 38K |
| 10 | March 8, 2016 12:00 | March 12, 2016 02:00 | 3d 14h | 3,566 | 21K |
Outage episodes by size in 2016: 88 reached 100+ customers, 55 reached 1,000+ customers, 3 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 2016, 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 | 2016 | 1.6 hrs | 0.86 | 63 min | 0.72 |
| 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 2016; 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, 2016, 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/2016/illinois/cook-county