County annual report · FIPS 55055
2019 Jefferson County, WI Power Outage Report
In 2019, customers in Jefferson County, WI went without power for an average of 3.5 hours, a total of 119K customer-hours (Wisconsin average 4.4 hours). That ranks 30th worst of 71 Wisconsin counties and 1486th of 2,945 nationally.
Compared with WI, the US and 2018
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Jefferson County, 2019
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 30, 2019 16:45 | July 1, 2019 22:15 | 1d 5h | 5,853 | 35K |
| 2 | June 27, 2019 21:30 | June 29, 2019 19:30 | 1d 22h | 4,142 | 31K |
| 3 | May 14, 2019 22:00 | May 15, 2019 00:45 | 2h 45m | 3,623 | 3,777 |
| 4 | March 25, 2019 10:45 | March 25, 2019 13:15 | 2h 30m | 2,717 | 5,170 |
| 5 | March 9, 2019 16:30 | March 9, 2019 20:00 | 3h 30m | 2,330 | 1,117 |
| 6 | July 19, 2019 08:15 | July 19, 2019 16:30 | 8h 15m | 2,269 | 2,560 |
| 7 | February 20, 2019 03:15 | February 20, 2019 05:45 | 2h 30m | 1,852 | 2,320 |
| 8 | July 7, 2019 08:45 | July 7, 2019 09:00 | 15m | 1,642 | 411 |
| 9 | April 18, 2019 03:15 | April 18, 2019 03:30 | 15m | 1,601 | 400 |
| 10 | August 6, 2019 15:45 | August 6, 2019 19:45 | 4h | 1,325 | 1,975 |
Outage episodes by size in 2019: 38 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 Jefferson County reported on EIA Form 861 for 2019, 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 | 2018 | 2.0 hrs | 0.73 | 70 min | 0.59 |
| Adams-Columbia Electric Coop | 2018 | 6.5 hrs | 0.91 | 50 min | 0.46 |
| 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 84% of Wisconsin's customers in 2019; 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, 2019, 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/2019/wisconsin/jefferson-county