County annual report · FIPS 17043
2021 DuPage County, IL Power Outage Report
In 2021, customers in DuPage County, IL went without power for an average of 2.2 hours, a total of 694K customer-hours (Illinois average 2.3 hours). That ranks 61st worst of 102 Illinois counties and 2143rd 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 DuPage 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 | February 18, 2021 15:30 | February 18, 2021 20:30 | 5h | 19,497 | 6,362 |
| 2 | June 20, 2021 05:00 | June 25, 2021 04:15 | 4d 23h | 15,340 | 211K |
| 3 | August 10, 2021 12:30 | August 14, 2021 04:45 | 3d 16h | 10,774 | 130K |
| 4 | July 29, 2021 08:30 | July 30, 2021 09:00 | 1d | 6,050 | 26K |
| 5 | April 26, 2021 13:30 | April 27, 2021 00:30 | 11h | 4,544 | 2,034 |
| 6 | August 7, 2021 21:30 | August 8, 2021 03:45 | 6h 15m | 3,176 | 2,862 |
| 7 | December 15, 2021 22:15 | December 17, 2021 04:15 | 1d 6h | 3,165 | 20K |
| 8 | December 10, 2021 13:00 | December 12, 2021 05:15 | 1d 16h | 3,083 | 20K |
| 9 | June 10, 2021 11:15 | June 12, 2021 03:00 | 1d 15h | 2,275 | 5,737 |
| 10 | August 24, 2021 13:30 | August 27, 2021 01:00 | 2d 11h | 2,157 | 20K |
Outage episodes by size in 2021: 277 reached 100+ customers, 31 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 DuPage 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 |
| City of Naperville - (IL) | 2021 | 20 min | 0.30 | - | - |
| City of St Charles - (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 98% of Illinois's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 313,751 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. DuPage County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), DuPage 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/dupage-county