County annual report · FIPS 55025
2018 Dane County, WI Power Outage Report
In 2018, customers in Dane County, WI went without power for an average of 0.8 hours, a total of 229K customer-hours (Wisconsin average 1.7 hours). That ranks 59th worst of 71 Wisconsin counties and 2399th of 2,798 nationally.
Compared with WI, the US and 2017
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Dane County, 2018
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 20, 2018 14:15 | August 22, 2018 22:45 | 2d 8h | 6,816 | 57K |
| 2 | September 2, 2018 06:15 | September 3, 2018 07:15 | 1d 1h | 3,336 | 11K |
| 3 | April 14, 2018 04:45 | April 15, 2018 15:30 | 1d 10h | 2,940 | 6,655 |
| 4 | May 26, 2018 11:15 | May 27, 2018 03:00 | 15h 45m | 2,825 | 3,159 |
| 5 | July 14, 2018 11:45 | July 15, 2018 07:00 | 19h 15m | 2,555 | 10K |
| 6 | July 2, 2018 12:15 | July 2, 2018 20:00 | 7h 45m | 2,446 | 716 |
| 7 | June 16, 2018 04:00 | June 17, 2018 07:30 | 1d 3h | 2,380 | 12K |
| 8 | August 28, 2018 08:00 | August 28, 2018 11:30 | 3h 30m | 2,356 | 2,720 |
| 9 | December 19, 2018 02:30 | December 20, 2018 00:00 | 21h 30m | 1,971 | 4,806 |
| 10 | October 20, 2018 13:30 | October 21, 2018 18:30 | 1d 5h | 1,790 | 8,536 |
Outage episodes by size in 2018: 154 reached 100+ customers, 27 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 Dane County reported on EIA Form 861 for 2018, 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 |
| City of Stoughton - (WI) | 2018 | 4.0 hrs | 1.10 | 51 min | 0.65 |
| Madison Gas & Electric Co | 2018 | 57 min | 0.41 | 28 min | 0.29 |
| Sun Prairie Utilities | 2018 | 13 min | 0.32 | - | - |
| Village of Waunakee - (WI) | 2018 | 34 min | 0.30 | 34 min | 0.30 |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Wisconsin Power & Light Co | - | - | - | - | - |
| Rock Energy Cooperative | - | - | - | - | - |
| Village of Black Earth - (WI) | - | - | - | - | - |
| Village of Mazomanie - (WI) | - | - | - | - | - |
| Village of Mt. Horeb - (WI) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 83% of Wisconsin's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 295,516 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. Dane County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Dane County, WI annual power outage report, 2018, 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/2018/wisconsin/dane-county