County annual report · FIPS 55055
2020 Jefferson County, WI Power Outage Report
In 2020, customers in Jefferson County, WI went without power for an average of 1.8 hours, a total of 63K customer-hours (Wisconsin average 1.8 hours). That ranks 30th worst of 72 Wisconsin counties and 2326th of 3,019 nationally.
Compared with WI, the US and 2019
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Jefferson County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 3, 2020 15:45 | December 3, 2020 16:15 | 30m | 5,926 | 2,963 |
| 2 | February 23, 2020 19:30 | February 23, 2020 20:00 | 30m | 5,884 | 1,899 |
| 3 | March 26, 2020 10:15 | March 26, 2020 20:30 | 10h 15m | 2,086 | 1,335 |
| 4 | February 13, 2020 11:15 | February 13, 2020 19:30 | 8h 15m | 1,993 | 507 |
| 5 | June 9, 2020 21:30 | June 10, 2020 19:00 | 21h 30m | 1,654 | 4,212 |
| 6 | January 21, 2020 04:45 | January 21, 2020 05:15 | 30m | 1,593 | 407 |
| 7 | April 20, 2020 23:00 | April 21, 2020 01:30 | 2h 30m | 1,512 | 1,525 |
| 8 | August 3, 2020 07:45 | August 3, 2020 12:30 | 4h 45m | 1,509 | 5,656 |
| 9 | December 24, 2020 05:30 | December 24, 2020 07:00 | 1h 30m | 1,509 | 2,262 |
| 10 | June 5, 2020 01:15 | June 5, 2020 01:30 | 15m | 1,489 | 372 |
Outage episodes by size in 2020: 41 reached 100+ customers, 13 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 2020, 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 | 2020 | 2.3 hrs | 0.87 | 1.6 hrs | 0.70 |
| Adams-Columbia Electric Coop | 2020 | 2.6 hrs | 0.71 | 2.6 hrs | 0.71 |
| 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 2020; 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, 2020, 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/2020/wisconsin/jefferson-county