County annual report · FIPS 55079
2025 Milwaukee County, WI Power Outage Report
In 2025, customers in Milwaukee County, WI went without power for an average of 3.2 hours, a total of 1.9M customer-hours (Wisconsin average 3.9 hours). That ranks 28th worst of 72 Wisconsin counties and 2010th of 3,000 nationally.
Compared with WI, the US and 2024
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Milwaukee County, 2025
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 9, 2025 12:00 | August 14, 2025 10:30 | 4d 22h | 34,345 | 764K |
| 2 | June 21, 2025 13:45 | June 25, 2025 07:00 | 3d 17h | 17,089 | 214K |
| 3 | May 15, 2025 13:30 | May 18, 2025 05:45 | 2d 16h | 16,409 | 167K |
| 4 | November 29, 2025 10:45 | November 30, 2025 19:00 | 1d 8h | 15,616 | 84K |
| 5 | June 29, 2025 19:30 | July 2, 2025 03:45 | 2d 8h | 8,274 | 49K |
| 6 | September 13, 2025 00:45 | September 14, 2025 05:30 | 1d 4h | 7,886 | 21K |
| 7 | June 13, 2025 03:45 | June 14, 2025 00:30 | 20h 45m | 6,618 | 8,728 |
| 8 | March 16, 2025 13:00 | March 17, 2025 05:00 | 16h | 5,413 | 14K |
| 9 | March 4, 2025 18:30 | March 5, 2025 11:15 | 16h 45m | 5,372 | 13K |
| 10 | August 20, 2025 13:15 | August 21, 2025 04:30 | 15h 15m | 5,368 | 5,719 |
Outage episodes by size in 2025: 174 reached 100+ customers, 70 reached 1,000+ customers, 4 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 2025, 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 |
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 2025; 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, 2025, 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/2025/wisconsin/milwaukee-county