County annual report · FIPS 55055
2024 Jefferson County, WI Power Outage Report
In 2024, customers in Jefferson County, WI went without power for an average of 4.5 hours, a total of 155K customer-hours (Wisconsin average 4.6 hours). That ranks 26th worst of 72 Wisconsin counties and 1723rd 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 Jefferson 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 | May 29, 2024 12:45 | May 29, 2024 23:30 | 10h 45m | 13,807 | 4,019 |
| 2 | June 23, 2024 00:15 | June 24, 2024 00:00 | 23h 45m | 7,148 | 28K |
| 3 | October 31, 2024 16:30 | November 1, 2024 07:30 | 15h | 4,437 | 6,442 |
| 4 | August 6, 2024 06:00 | August 7, 2024 07:30 | 1d 1h | 3,945 | 10K |
| 5 | May 7, 2024 23:00 | May 8, 2024 10:00 | 11h | 3,213 | 10K |
| 6 | January 13, 2024 00:30 | January 14, 2024 18:30 | 1d 18h | 2,859 | 22K |
| 7 | May 28, 2024 22:45 | May 29, 2024 06:00 | 7h 15m | 2,273 | 2,302 |
| 8 | September 1, 2024 00:45 | September 1, 2024 05:45 | 5h | 2,171 | 1,629 |
| 9 | April 16, 2024 02:00 | April 16, 2024 08:30 | 6h 30m | 1,995 | 1,055 |
| 10 | May 21, 2024 19:15 | May 23, 2024 05:00 | 1d 9h | 1,912 | 17K |
Outage episodes by size in 2024: 57 reached 100+ customers, 17 reached 1,000+ customers, 1 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 Jefferson 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 |
| Adams-Columbia Electric Coop | 2024 | 2.3 hrs | 1.15 | 2.3 hrs | 1.15 |
| Wisconsin Power & Light Co | - | - | - | - | - |
| Jefferson Utilities | - | - | - | - | - |
| Lake Mills Light & Water | - | - | - | - | - |
| Waterloo Light & Water Comm | - | - | - | - | - |
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 ÷ 34,512 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. Jefferson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Jefferson 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/jefferson-county