County annual report · FIPS 55079
2021 Milwaukee County, WI Power Outage Report
In 2021, customers in Milwaukee County, WI went without power for an average of 6.6 hours, a total of 3.9M customer-hours (Wisconsin average 4.7 hours). That ranks 15th worst of 72 Wisconsin counties and 1082nd 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 Milwaukee 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 12:00 | August 11, 2021 12:45 | 1d | 64,397 | 553K |
| 2 | August 11, 2021 15:30 | August 11, 2021 17:15 | 1h 45m | 63,517 | 95K |
| 3 | August 11, 2021 18:15 | August 18, 2021 08:15 | 6d 14h | 62,447 | 1.8M |
| 4 | August 11, 2021 13:30 | August 11, 2021 14:45 | 1h 15m | 61,356 | 76K |
| 5 | December 15, 2021 14:30 | December 20, 2021 01:00 | 4d 10h | 31,980 | 476K |
| 6 | August 6, 2021 15:15 | August 10, 2021 10:45 | 3d 19h | 18,943 | 164K |
| 7 | February 2, 2021 18:00 | February 3, 2021 05:30 | 11h 30m | 10,087 | 28K |
| 8 | October 24, 2021 19:15 | October 26, 2021 09:00 | 1d 13h | 9,419 | 70K |
| 9 | December 13, 2021 13:30 | December 13, 2021 23:30 | 10h | 8,937 | 2,419 |
| 10 | December 11, 2021 01:45 | December 12, 2021 19:45 | 1d 18h | 8,124 | 35K |
Outage episodes by size in 2021: 201 reached 100+ customers, 98 reached 1,000+ customers, 7 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 Milwaukee 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 |
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 ÷ 594,641 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. Milwaukee County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Milwaukee 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/milwaukee-county