County annual report · FIPS 55025
2021 Dane County, WI Power Outage Report
In 2021, customers in Dane County, WI went without power for an average of 0.7 hours, a total of 199K customer-hours (Wisconsin average 4.7 hours). That ranks 69th worst of 72 Wisconsin counties and 2770th of 2,974 nationally.
Compared with WI, the US and 2020
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Dane County, 2021
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 1, 2021 03:00 | May 1, 2021 06:45 | 3h 45m | 11,430 | 17K |
| 2 | December 16, 2021 02:00 | December 17, 2021 07:15 | 1d 5h | 6,242 | 30K |
| 3 | August 10, 2021 22:30 | August 12, 2021 05:30 | 1d 7h | 4,729 | 21K |
| 4 | July 29, 2021 06:00 | July 30, 2021 23:00 | 1d 17h | 4,318 | 27K |
| 5 | August 21, 2021 11:45 | August 22, 2021 06:15 | 18h 30m | 2,476 | 5,643 |
| 6 | May 12, 2021 04:15 | May 12, 2021 06:15 | 2h | 2,204 | 3,015 |
| 7 | December 28, 2021 09:15 | December 28, 2021 09:30 | 15m | 2,150 | 538 |
| 8 | October 7, 2021 14:30 | October 8, 2021 03:30 | 13h | 2,130 | 4,969 |
| 9 | January 24, 2021 16:15 | January 24, 2021 20:30 | 4h 15m | 2,029 | 2,633 |
| 10 | December 8, 2021 02:15 | December 8, 2021 03:30 | 1h 15m | 2,025 | 2,531 |
Outage episodes by size in 2021: 116 reached 100+ customers, 18 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 Dane County reported on EIA Form 861 for 2021, 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 | 2021 | 7.0 hrs | 1.13 | 1.7 hrs | 0.73 |
| Adams-Columbia Electric Coop | 2021 | 1.7 hrs | 0.74 | 1.7 hrs | 0.74 |
| Rock Energy Cooperative | 2021 | 43 min | 0.47 | - | - |
| City of Stoughton - (WI) | 2021 | 36 min | 0.41 | 36 min | 0.41 |
| Madison Gas & Electric Co | 2021 | 40 min | 0.28 | 32 min | 0.25 |
| Sun Prairie Utilities | 2021 | 13 min | 0.51 | 13 min | 0.51 |
| Village of Waunakee - (WI) | 2021 | 40 min | 0.17 | 40 min | 0.17 |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Wisconsin Power & Light Co | - | - | - | - | - |
| 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 85% of Wisconsin's customers in 2021; 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, 2021, 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/2021/wisconsin/dane-county