County annual report · FIPS 55039
2025 Fond du Lac County, WI Power Outage Report
In 2025, customers in Fond du Lac County, WI went without power for an average of 1.0 hours, a total of 91K customer-hours (Wisconsin average 3.9 hours). That ranks 62nd worst of 72 Wisconsin counties and 2755th 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 Fond du Lac 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 | May 15, 2025 22:45 | May 17, 2025 11:00 | 1d 12h | 3,863 | 22K |
| 2 | June 23, 2025 13:45 | June 25, 2025 02:15 | 1d 12h | 3,750 | 19K |
| 3 | October 9, 2025 15:00 | October 9, 2025 17:30 | 2h 30m | 2,463 | 3,102 |
| 4 | September 12, 2025 17:15 | September 12, 2025 20:45 | 3h 30m | 2,429 | 734 |
| 5 | September 13, 2025 09:00 | September 13, 2025 16:30 | 7h 30m | 1,987 | 1,997 |
| 6 | March 19, 2025 22:15 | March 20, 2025 00:00 | 1h 45m | 1,809 | 908 |
| 7 | June 27, 2025 13:00 | June 27, 2025 18:30 | 5h 30m | 1,806 | 910 |
| 8 | June 11, 2025 14:00 | June 11, 2025 22:15 | 8h 15m | 1,470 | 543 |
| 9 | April 11, 2025 03:30 | April 11, 2025 05:15 | 1h 45m | 1,240 | 312 |
| 10 | January 6, 2025 21:00 | January 6, 2025 23:15 | 2h 15m | 1,152 | 867 |
Outage episodes by size in 2025: 51 reached 100+ customers, 11 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 Fond du Lac 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 |
| Wisconsin Public Service Corp | 2024 | 7.8 hrs | 1.22 | 1.6 hrs | 0.77 |
| City of Plymouth - (WI) | 2024 | 31 min | 0.30 | 31 min | 0.30 |
| Waupun Utilities | 2024 | 13 min | 0.13 | 13 min | 0.13 |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Wisconsin Power & Light Co | - | - | - | - | - |
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 ÷ 89,727 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. Fond du Lac County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Fond du Lac 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/fond-du-lac-county