County annual report · FIPS 55093
2021 Pierce County, WI Power Outage Report
In 2021, customers in Pierce County, WI went without power for an average of 1.5 hours, a total of 24K customer-hours (Wisconsin average 4.7 hours). That ranks 57th worst of 72 Wisconsin counties and 2482nd 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 Pierce 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 | November 15, 2021 12:15 | November 15, 2021 17:15 | 5h | 1,447 | 1,472 |
| 2 | June 9, 2021 04:15 | June 9, 2021 12:45 | 8h 30m | 1,406 | 4,802 |
| 3 | July 29, 2021 03:30 | July 30, 2021 00:30 | 21h | 1,005 | 3,930 |
| 4 | June 11, 2021 17:15 | June 13, 2021 02:15 | 1d 9h | 941 | 3,859 |
| 5 | December 7, 2021 15:30 | December 7, 2021 18:00 | 2h 30m | 749 | 1,308 |
| 6 | September 17, 2021 02:15 | September 17, 2021 07:45 | 5h 30m | 745 | 377 |
| 7 | December 16, 2021 02:15 | December 17, 2021 18:45 | 1d 16h | 670 | 3,384 |
| 8 | August 24, 2021 10:00 | August 25, 2021 01:30 | 15h 30m | 629 | 911 |
| 9 | June 13, 2021 22:45 | June 14, 2021 03:00 | 4h 15m | 216 | 699 |
| 10 | May 17, 2021 16:00 | May 17, 2021 17:45 | 1h 45m | 119 | 117 |
Outage episodes by size in 2021: 10 reached 100+ customers, 3 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 Pierce 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 |
|---|---|---|---|---|---|
| Northern States Power Co | 2021 | 6.7 hrs | 1.60 | 2.2 hrs | 1.10 |
| Dunn County Electric Coop | 2021 | 2.1 hrs | 0.92 | 76 min | 0.63 |
| Pierce-Pepin Coop Services | 2018 | 3.0 hrs | 1.10 | 2.9 hrs | 1.04 |
| St Croix Electric Coop | 2018 | 1.8 hrs | 0.69 | 1.7 hrs | 0.68 |
| City of River Falls | 2021 | 14 min | 0.08 | 14 min | 0.08 |
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 ÷ 16,786 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. Pierce County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Pierce 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/pierce-county