County annual report · FIPS 19189
2021 Winnebago County, IA Power Outage Report
In 2021, customers in Winnebago County, IA went without power for an average of 5.5 hours, a total of 40K customer-hours (Iowa average 2.7 hours). That ranks 29th worst of 99 Iowa counties and 1238th of 2,974 nationally.
Compared with IA, the US and 2020
Coverage line is EAGLE-I's share of Iowa 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 | December 16, 2021 00:30 | December 17, 2021 03:00 | 1d 2h | 3,317 | 24K |
| 2 | May 20, 2021 04:45 | May 20, 2021 13:00 | 8h 15m | 1,045 | 5,191 |
| 3 | August 27, 2021 05:30 | August 27, 2021 21:15 | 15h 45m | 596 | 1,334 |
| 4 | September 20, 2021 18:30 | September 20, 2021 23:15 | 4h 45m | 372 | 673 |
| 5 | June 17, 2021 19:45 | June 17, 2021 21:15 | 1h 30m | 333 | 168 |
| 6 | July 7, 2021 06:30 | July 7, 2021 09:00 | 2h 30m | 276 | 690 |
| 7 | April 7, 2021 05:30 | April 7, 2021 09:15 | 3h 45m | 269 | 1,009 |
| 8 | May 2, 2021 20:30 | May 2, 2021 23:45 | 3h 15m | 228 | 431 |
| 9 | August 22, 2021 18:45 | August 22, 2021 21:00 | 2h 15m | 200 | 450 |
| 10 | May 30, 2021 04:45 | May 30, 2021 14:15 | 9h 30m | 192 | 308 |
Outage episodes by size in 2021: 16 reached 100+ customers, 2 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 |
|---|---|---|---|---|---|
| Heartland Power Coop | 2021 | 3.2 hrs | 0.80 | 35 min | 0.39 |
| Interstate Power and Light Co | - | - | - | - | - |
| Prairie Energy Coop | - | - | - | - | - |
| City of Forest City- (IA) | - | - | - | - | - |
| City of Lake Mills | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 91% of Iowa's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 7,213 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, IA 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/iowa/winnebago-county