County annual report · FIPS 55133
2015 Waukesha County, WI Power Outage Report
In 2015, customers in Waukesha County, WI went without power for an average of 2.1 hours, a total of 297K customer-hours (Wisconsin average 1.5 hours). That ranks 24th worst of 71 Wisconsin counties and 1207th of 2,484 nationally.
Compared with WI, the US
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Waukesha County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 22, 2015 15:15 | June 24, 2015 04:00 | 1d 12h | 6,612 | 40K |
| 2 | July 13, 2015 10:15 | July 15, 2015 02:30 | 1d 16h | 6,157 | 45K |
| 3 | August 14, 2015 17:30 | August 17, 2015 03:00 | 2d 9h | 6,061 | 69K |
| 4 | July 18, 2015 12:00 | July 19, 2015 01:45 | 13h 45m | 5,083 | 28K |
| 5 | December 24, 2015 04:00 | December 25, 2015 11:00 | 1d 7h | 4,827 | 9,526 |
| 6 | October 24, 2015 12:15 | October 25, 2015 08:15 | 20h | 4,371 | 8,489 |
| 7 | December 11, 2015 18:00 | December 11, 2015 18:15 | 15m | 4,365 | 1,091 |
| 8 | December 28, 2015 12:00 | December 30, 2015 00:45 | 1d 12h | 3,833 | 6,200 |
| 9 | January 10, 2015 15:30 | January 10, 2015 15:45 | 15m | 3,763 | 941 |
| 10 | November 23, 2015 18:15 | November 23, 2015 18:45 | 30m | 2,649 | 1,325 |
Outage episodes by size in 2015: 72 reached 100+ customers, 25 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 Waukesha County reported on EIA Form 861 for 2015, 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 | 2015 | 2.1 hrs | 1.63 | 1.8 hrs | 1.38 |
| 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 2015; 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, 2015, 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/2015/wisconsin/waukesha-county