County annual report · FIPS 17037
2021 DeKalb County, IL Power Outage Report
In 2021, customers in DeKalb County, IL went without power for an average of 1.4 hours, a total of 110K customer-hours (Illinois average 2.3 hours). That ranks 87th worst of 102 Illinois counties and 2518th of 2,974 nationally.
Compared with IL, the US and 2020
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in DeKalb County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 10, 2021 22:00 | August 13, 2021 22:15 | 3d | 6,262 | 39K |
| 2 | August 25, 2021 00:00 | August 25, 2021 23:15 | 23h 15m | 3,546 | 20K |
| 3 | December 11, 2021 10:30 | December 12, 2021 01:30 | 15h | 1,628 | 4,643 |
| 4 | October 7, 2021 11:45 | October 7, 2021 18:45 | 7h | 1,576 | 770 |
| 5 | July 29, 2021 08:15 | July 30, 2021 06:00 | 21h 45m | 1,556 | 4,625 |
| 6 | September 14, 2021 14:45 | September 14, 2021 20:45 | 6h | 1,423 | 1,450 |
| 7 | January 4, 2021 11:45 | January 7, 2021 19:45 | 3d 8h | 1,283 | 11K |
| 8 | June 11, 2021 14:30 | June 12, 2021 21:00 | 1d 6h | 1,272 | 2,204 |
| 9 | May 1, 2021 19:30 | May 2, 2021 03:00 | 7h 30m | 743 | 1,416 |
| 10 | March 25, 2021 12:30 | March 25, 2021 16:30 | 4h | 558 | 274 |
Outage episodes by size in 2021: 37 reached 100+ customers, 8 reached 1,000+ customers, 0 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 DeKalb County reported on EIA Form 861 for 2021, 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 | 2021 | 1.7 hrs | 0.77 | 43 min | 0.59 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 98% of Illinois's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 79,682 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. DeKalb County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), DeKalb County, IL annual power outage report, 2021, 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/2021/illinois/dekalb-county