County annual report · FIPS 55097
2021 Portage County, WI Power Outage Report
In 2021, customers in Portage County, WI went without power for an average of 4.7 hours, a total of 128K customer-hours (Wisconsin average 4.7 hours). That ranks 20th worst of 72 Wisconsin counties and 1390th 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 Portage 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 | December 16, 2021 04:30 | December 18, 2021 22:45 | 2d 18h | 4,953 | 69K |
| 2 | March 10, 2021 10:45 | March 10, 2021 13:30 | 2h 45m | 3,440 | 6,339 |
| 3 | March 31, 2021 05:30 | March 31, 2021 06:30 | 1h | 3,345 | 1,676 |
| 4 | July 29, 2021 03:15 | July 30, 2021 14:45 | 1d 11h | 3,175 | 21K |
| 5 | August 29, 2021 12:45 | August 29, 2021 16:45 | 4h | 3,085 | 2,320 |
| 6 | July 27, 2021 06:30 | July 28, 2021 07:00 | 1d | 1,583 | 2,436 |
| 7 | August 27, 2021 23:30 | August 28, 2021 19:30 | 20h | 1,500 | 5,926 |
| 8 | November 18, 2021 14:15 | November 18, 2021 16:00 | 1h 45m | 798 | 1,397 |
| 9 | July 26, 2021 21:45 | July 26, 2021 23:45 | 2h | 623 | 549 |
| 10 | August 29, 2021 02:45 | August 29, 2021 09:00 | 6h 15m | 512 | 1,957 |
Outage episodes by size in 2021: 38 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 Portage 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 Public Service Corp | 2021 | 9.3 hrs | 1.46 | 1.6 hrs | 0.83 |
| Adams-Columbia Electric Coop | 2021 | 1.7 hrs | 0.74 | 1.7 hrs | 0.74 |
| Central Wisconsin Elec Coop | 2018 | 2.5 hrs | 1.27 | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Wisconsin Power & Light Co | - | - | - | - | - |
| Consolidated Water Power Co | - | - | - | - | - |
| Wisconsin Rapids W W & L 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 85% of Wisconsin's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 27,174 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. Portage County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Portage 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/portage-county