County annual report · FIPS 55131
2021 Washington County, WI Power Outage Report
In 2021, customers in Washington County, WI went without power for an average of 9.5 hours, a total of 326K customer-hours (Wisconsin average 4.7 hours). That ranks 11th worst of 72 Wisconsin counties and 813th 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 Washington 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 16:45 | August 11, 2021 12:45 | 20h | 10,326 | 61K |
| 2 | August 6, 2021 00:00 | August 6, 2021 02:30 | 2h 30m | 8,855 | 5,223 |
| 3 | August 3, 2021 08:45 | August 3, 2021 11:00 | 2h 15m | 7,596 | 11K |
| 4 | December 15, 2021 23:00 | December 19, 2021 23:30 | 4d | 5,018 | 111K |
| 5 | May 24, 2021 08:00 | May 24, 2021 17:30 | 9h 30m | 3,035 | 5,137 |
| 6 | March 17, 2021 23:45 | March 18, 2021 03:15 | 3h 30m | 3,030 | 5,812 |
| 7 | August 6, 2021 22:00 | August 9, 2021 21:45 | 2d 23h | 2,729 | 19K |
| 8 | August 11, 2021 15:30 | August 11, 2021 17:15 | 1h 45m | 2,488 | 3,651 |
| 9 | September 1, 2021 19:15 | September 3, 2021 06:15 | 1d 11h | 2,427 | 6,182 |
| 10 | August 11, 2021 13:30 | August 11, 2021 14:45 | 1h 15m | 2,377 | 2,953 |
Outage episodes by size in 2021: 56 reached 100+ customers, 20 reached 1,000+ customers, 1 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 Washington 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 |
| Hartford Electric | - | - | - | - | - |
| Slinger Utilities | - | - | - | - | - |
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 ÷ 34,303 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. Washington County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Washington 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/washington-county