County annual report · FIPS 55133
2022 Waukesha County, WI Power Outage Report
In 2022, customers in Waukesha County, WI went without power for an average of 6.4 hours, a total of 917K customer-hours (Wisconsin average 4.6 hours). That ranks 22nd worst of 72 Wisconsin counties and 1135th of 2,976 nationally.
Compared with WI, the US and 2021
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Waukesha County, 2022
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 4, 2022 23:15 | November 8, 2022 09:15 | 3d 10h | 15,243 | 262K |
| 2 | October 12, 2022 11:30 | October 13, 2022 08:15 | 20h 45m | 7,783 | 17K |
| 3 | May 13, 2022 12:00 | May 14, 2022 00:30 | 12h 30m | 6,812 | 2,737 |
| 4 | June 13, 2022 17:00 | June 19, 2022 03:30 | 5d 10h | 6,121 | 162K |
| 5 | March 6, 2022 00:45 | March 7, 2022 08:15 | 1d 7h | 6,013 | 47K |
| 6 | September 11, 2022 13:45 | September 13, 2022 04:15 | 1d 14h | 5,743 | 60K |
| 7 | July 24, 2022 00:30 | July 25, 2022 10:00 | 1d 9h | 5,621 | 51K |
| 8 | September 22, 2022 10:45 | September 23, 2022 01:30 | 14h 45m | 5,212 | 9,184 |
| 9 | September 25, 2022 23:00 | September 27, 2022 01:30 | 1d 2h | 4,801 | 22K |
| 10 | February 11, 2022 10:30 | February 12, 2022 03:30 | 17h | 4,168 | 1,072 |
Outage episodes by size in 2022: 113 reached 100+ customers, 46 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 Waukesha County reported on EIA Form 861 for 2022, 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 | 2022 | 4.7 hrs | 1.05 | 2.0 hrs | 0.82 |
| Oconomowoc 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 2022; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 143,177 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. Waukesha County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Waukesha County, WI annual power outage report, 2022, 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/2022/wisconsin/waukesha-county