County annual report · FIPS 17201
2021 Winnebago County, IL Power Outage Report
In 2021, customers in Winnebago County, IL went without power for an average of 2.0 hours, a total of 239K customer-hours (Illinois average 2.3 hours). That ranks 68th worst of 102 Illinois counties and 2231st 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 Winnebago 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 14:00 | August 14, 2021 06:00 | 3d 16h | 7,882 | 94K |
| 2 | December 15, 2021 15:45 | December 17, 2021 06:45 | 1d 15h | 3,270 | 25K |
| 3 | August 20, 2021 08:45 | August 20, 2021 23:15 | 14h 30m | 2,801 | 1,249 |
| 4 | August 24, 2021 23:15 | August 26, 2021 00:30 | 1d 1h | 2,653 | 11K |
| 5 | December 11, 2021 08:15 | December 12, 2021 01:45 | 17h 30m | 1,508 | 3,432 |
| 6 | August 9, 2021 11:30 | August 10, 2021 05:15 | 17h 45m | 1,460 | 3,564 |
| 7 | October 24, 2021 22:30 | October 26, 2021 02:45 | 1d 4h | 1,453 | 8,693 |
| 8 | July 5, 2021 21:45 | July 6, 2021 00:00 | 2h 15m | 1,284 | 345 |
| 9 | June 8, 2021 20:15 | June 9, 2021 01:45 | 5h 30m | 1,273 | 527 |
| 10 | April 10, 2021 21:00 | April 11, 2021 02:45 | 5h 45m | 1,234 | 946 |
Outage episodes by size in 2021: 110 reached 100+ customers, 14 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 Winnebago 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 |
| Rock Energy Cooperative | 2021 | 43 min | 0.47 | - | - |
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 ÷ 120,789 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. Winnebago County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Winnebago 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/winnebago-county