County annual report · FIPS 55127
2025 Walworth County, WI Power Outage Report
In 2025, customers in Walworth County, WI went without power for an average of 3.0 hours, a total of 137K customer-hours (Wisconsin average 3.9 hours). That ranks 30th worst of 72 Wisconsin counties and 2058th of 3,000 nationally.
Compared with WI, the US and 2024
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Walworth County, 2025
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 18, 2025 18:45 | December 18, 2025 22:45 | 4h | 3,916 | 3,950 |
| 2 | May 15, 2025 19:00 | May 18, 2025 02:15 | 2d 7h | 3,390 | 29K |
| 3 | March 15, 2025 05:00 | March 17, 2025 23:00 | 2d 18h | 2,655 | 14K |
| 4 | August 24, 2025 01:00 | August 24, 2025 09:00 | 8h | 2,238 | 12K |
| 5 | August 12, 2025 10:30 | August 12, 2025 18:45 | 8h 15m | 1,561 | 4,375 |
| 6 | December 17, 2025 22:00 | December 18, 2025 01:15 | 3h 15m | 1,499 | 2,623 |
| 7 | October 19, 2025 10:30 | October 19, 2025 16:30 | 6h | 1,416 | 5,524 |
| 8 | July 4, 2025 05:45 | July 4, 2025 14:30 | 8h 45m | 1,401 | 3,850 |
| 9 | March 22, 2025 04:30 | March 22, 2025 11:30 | 7h | 1,342 | 6,343 |
| 10 | July 11, 2025 20:45 | July 13, 2025 00:00 | 1d 3h | 1,286 | 9,308 |
Outage episodes by size in 2025: 54 reached 100+ customers, 12 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 2025, 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 | 2024 | 4.9 hrs | 1.04 | 1.8 hrs | 0.74 |
| Rock Energy Cooperative | 2024 | 53 min | 0.48 | 27 min | 0.36 |
| 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 n/a of Wisconsin's customers in 2025; 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, 2025, 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/2025/wisconsin/walworth-county