County annual report · FIPS 55133
2024 Waukesha County, WI Power Outage Report
In 2024, customers in Waukesha County, WI went without power for an average of 12.9 hours, a total of 1.8M customer-hours (Wisconsin average 4.6 hours). That ranks 8th worst of 72 Wisconsin counties and 747th of 2,990 nationally.
Compared with WI, the US and 2023
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Waukesha County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 12, 2024 11:45 | January 17, 2024 03:45 | 4d 16h | 34,927 | 1.2M |
| 2 | May 22, 2024 00:00 | May 23, 2024 09:00 | 1d 9h | 16,312 | 85K |
| 3 | January 9, 2024 16:15 | January 11, 2024 02:00 | 1d 9h | 7,928 | 37K |
| 4 | August 1, 2024 23:45 | August 3, 2024 04:00 | 1d 4h | 7,513 | 25K |
| 5 | August 5, 2024 19:15 | August 7, 2024 01:15 | 1d 6h | 5,788 | 25K |
| 6 | October 31, 2024 14:45 | November 2, 2024 06:15 | 1d 15h | 5,444 | 50K |
| 7 | October 27, 2024 23:30 | October 28, 2024 04:00 | 4h 30m | 4,569 | 5,478 |
| 8 | July 14, 2024 01:30 | July 16, 2024 23:30 | 2d 22h | 4,476 | 38K |
| 9 | June 25, 2024 01:45 | June 27, 2024 08:45 | 2d 7h | 3,713 | 19K |
| 10 | December 16, 2024 05:15 | December 16, 2024 06:00 | 45m | 3,636 | 2,727 |
Outage episodes by size in 2024: 137 reached 100+ customers, 51 reached 1,000+ customers, 2 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 2024, 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 |
| 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 n/a of Wisconsin's customers in 2024; 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, 2024, 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/2024/wisconsin/waukesha-county