County annual report · FIPS 55055
2015 Jefferson County, WI Power Outage Report
In 2015, customers in Jefferson County, WI went without power for an average of 2.0 hours, a total of 69K customer-hours (Wisconsin average 1.5 hours). That ranks 25th worst of 71 Wisconsin counties and 1234th of 2,484 nationally.
Compared with WI, the US
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Jefferson County, 2015
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 2, 2015 22:15 | August 3, 2015 20:30 | 22h 15m | 5,251 | 32K |
| 2 | January 10, 2015 23:00 | January 11, 2015 00:45 | 1h 45m | 3,434 | 4,304 |
| 3 | July 13, 2015 09:45 | July 14, 2015 19:45 | 1d 10h | 1,534 | 11K |
| 4 | September 8, 2015 11:45 | September 8, 2015 16:45 | 5h | 1,530 | 2,354 |
| 5 | July 18, 2015 18:45 | July 19, 2015 01:45 | 7h | 1,497 | 3,162 |
| 6 | November 18, 2015 19:15 | November 18, 2015 21:00 | 1h 45m | 1,468 | 482 |
| 7 | September 17, 2015 20:30 | September 17, 2015 21:00 | 30m | 1,379 | 690 |
| 8 | July 17, 2015 15:45 | July 17, 2015 18:00 | 2h 15m | 1,378 | 1,036 |
| 9 | July 9, 2015 16:15 | July 9, 2015 19:15 | 3h | 1,052 | 1,716 |
| 10 | September 30, 2015 15:45 | September 30, 2015 17:00 | 1h 15m | 849 | 849 |
Outage episodes by size in 2015: 23 reached 100+ customers, 9 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 2015, 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 | 2015 | 2.1 hrs | 1.63 | 1.8 hrs | 1.38 |
| Adams-Columbia Electric Coop | 2015 | 2.0 hrs | 0.77 | 67 min | 0.59 |
| 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 2015; 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, 2015, 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/2015/wisconsin/jefferson-county