County annual report · FIPS 55111
2021 Sauk County, WI Power Outage Report
In 2021, customers in Sauk County, WI went without power for an average of 1.0 hours, a total of 61K customer-hours (Wisconsin average 4.7 hours). That ranks 61st worst of 72 Wisconsin counties and 2668th 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 Sauk 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 | July 14, 2021 22:00 | July 15, 2021 13:15 | 15h 15m | 4,551 | 18K |
| 2 | March 28, 2021 17:15 | March 28, 2021 22:15 | 5h | 4,090 | 1,057 |
| 3 | July 29, 2021 05:30 | July 29, 2021 22:45 | 17h 15m | 1,572 | 5,882 |
| 4 | August 10, 2021 22:15 | August 11, 2021 10:15 | 12h | 1,272 | 5,432 |
| 5 | February 9, 2021 04:45 | February 9, 2021 07:15 | 2h 30m | 1,238 | 3,095 |
| 6 | March 10, 2021 13:00 | March 10, 2021 18:45 | 5h 45m | 1,238 | 1,248 |
| 7 | July 4, 2021 09:15 | July 4, 2021 15:45 | 6h 30m | 1,011 | 1,018 |
| 8 | December 16, 2021 02:00 | December 17, 2021 09:45 | 1d 7h | 893 | 6,676 |
| 9 | November 6, 2021 21:00 | November 6, 2021 22:00 | 1h | 829 | 308 |
| 10 | July 8, 2021 09:00 | July 8, 2021 12:00 | 3h | 807 | 2,361 |
Outage episodes by size in 2021: 34 reached 100+ customers, 7 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 Sauk 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 |
|---|---|---|---|---|---|
| Adams-Columbia Electric Coop | 2021 | 1.7 hrs | 0.74 | 1.7 hrs | 0.74 |
| Vernon Electric Coop | 2018 | 3.8 hrs | - | 2.4 hrs | - |
| Oakdale Electric Coop | 2021 | 1.8 hrs | 0.93 | 63 min | 0.72 |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Wisconsin Power & Light Co | - | - | - | - | - |
| Richland Electric Coop | - | - | - | - | - |
| Wisconsin Dells Electric Util | - | - | - | - | - |
| Reedsburg Utility Comm | - | - | - | - | - |
| Village of Prairie Du Sac - (WI) | - | - | - | - | - |
| Village of Sauk City - (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 ÷ 60,955 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. Sauk County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sauk 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/sauk-county