County annual report · FIPS 55139
2021 Winnebago County, WI Power Outage Report
In 2021, customers in Winnebago County, WI went without power for an average of 1.8 hours, a total of 132K customer-hours (Wisconsin average 4.7 hours). That ranks 50th worst of 72 Wisconsin counties and 2334th of 2,974 nationally.
Compared with WI, the US and 2020
Coverage line is EAGLE-I's share of Wisconsin 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 | July 29, 2021 04:00 | July 31, 2021 14:45 | 2d 10h | 4,582 | 60K |
| 2 | August 18, 2021 18:30 | August 19, 2021 05:15 | 10h 45m | 4,534 | 9,867 |
| 3 | September 27, 2021 23:30 | September 28, 2021 02:00 | 2h 30m | 3,203 | 4,006 |
| 4 | July 7, 2021 17:15 | July 7, 2021 18:45 | 1h 30m | 2,817 | 4,217 |
| 5 | December 12, 2021 04:45 | December 12, 2021 07:30 | 2h 45m | 2,425 | 6,046 |
| 6 | December 16, 2021 05:15 | December 17, 2021 13:15 | 1d 8h | 1,861 | 4,651 |
| 7 | October 21, 2021 11:30 | October 21, 2021 13:15 | 1h 45m | 1,390 | 2,433 |
| 8 | May 27, 2021 21:15 | May 28, 2021 04:45 | 7h 30m | 1,378 | 1,376 |
| 9 | August 27, 2021 23:15 | August 29, 2021 08:45 | 1d 9h | 1,338 | 8,808 |
| 10 | June 26, 2021 22:45 | June 27, 2021 03:15 | 4h 30m | 1,097 | 575 |
Outage episodes by size in 2021: 47 reached 100+ customers, 10 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 |
|---|---|---|---|---|---|
| Wisconsin Electric Power Co | 2021 | 7.0 hrs | 1.13 | 1.7 hrs | 0.73 |
| Wisconsin Public Service Corp | 2021 | 9.3 hrs | 1.46 | 1.6 hrs | 0.83 |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Wisconsin Power & Light Co | - | - | - | - | - |
| City of Menasha - (WI) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 85% of Wisconsin's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 74,573 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, WI 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/wisconsin/winnebago-county