County annual report · FIPS 55127
2021 Walworth County, WI Power Outage Report
In 2021, customers in Walworth County, WI went without power for an average of 4.2 hours, a total of 191K customer-hours (Wisconsin average 4.7 hours). That ranks 25th worst of 72 Wisconsin counties and 1495th 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 Walworth 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 23:45 | August 13, 2021 09:15 | 2d 9h | 7,818 | 73K |
| 2 | June 18, 2021 08:00 | June 18, 2021 20:15 | 12h 15m | 3,379 | 3,831 |
| 3 | December 16, 2021 01:45 | December 18, 2021 07:45 | 2d 6h | 2,260 | 32K |
| 4 | December 6, 2021 14:00 | December 6, 2021 17:30 | 3h 30m | 1,854 | 3,851 |
| 5 | February 15, 2021 10:45 | February 15, 2021 11:30 | 45m | 1,453 | 1,090 |
| 6 | February 15, 2021 08:00 | February 15, 2021 08:45 | 45m | 1,452 | 1,089 |
| 7 | May 1, 2021 18:15 | May 2, 2021 08:00 | 13h 45m | 1,337 | 6,016 |
| 8 | July 14, 2021 20:30 | July 15, 2021 02:00 | 5h 30m | 1,311 | 1,803 |
| 9 | July 6, 2021 16:00 | July 7, 2021 06:45 | 14h 45m | 1,272 | 2,433 |
| 10 | August 10, 2021 17:00 | August 10, 2021 17:15 | 15m | 1,248 | 312 |
Outage episodes by size in 2021: 62 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 Walworth 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 |
| Rock Energy Cooperative | 2021 | 43 min | 0.47 | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Wisconsin Power & Light Co | - | - | - | - | - |
| City of Elkhorn - (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 ÷ 45,649 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. Walworth County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Walworth 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/walworth-county