County annual report · FIPS 55121
2021 Trempealeau County, WI Power Outage Report
In 2021, customers in Trempealeau County, WI went without power for an average of 3.4 hours, a total of 50K customer-hours (Wisconsin average 4.7 hours). That ranks 31st worst of 72 Wisconsin counties and 1716th 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 Trempealeau 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 02:30 | December 18, 2021 02:00 | 1d 23h | 2,900 | 31K |
| 2 | August 29, 2021 08:30 | August 29, 2021 11:30 | 3h | 1,450 | 4,350 |
| 3 | July 29, 2021 03:45 | July 31, 2021 01:00 | 1d 21h | 527 | 4,604 |
| 4 | June 18, 2021 03:00 | June 18, 2021 16:15 | 13h 15m | 383 | 2,531 |
| 5 | December 11, 2021 13:00 | December 11, 2021 15:45 | 2h 45m | 264 | 726 |
| 6 | August 7, 2021 18:15 | August 7, 2021 21:30 | 3h 15m | 225 | 357 |
| 7 | August 18, 2021 16:45 | August 18, 2021 23:45 | 7h | 205 | 440 |
| 8 | July 6, 2021 19:45 | July 7, 2021 01:45 | 6h | 138 | 372 |
| 9 | May 25, 2021 22:15 | May 26, 2021 14:00 | 15h 45m | 106 | 265 |
| 10 | September 20, 2021 23:15 | September 21, 2021 03:00 | 3h 45m | 91 | 139 |
Outage episodes by size in 2021: 9 reached 100+ customers, 2 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 Trempealeau 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 |
| Riverland Energy Cooperative | 2021 | 5.7 hrs | 1.31 | 72 min | 0.77 |
| Eau Claire Electric Coop | - | - | - | - | - |
| Jackson Electric Coop, Inc - (WI) | - | - | - | - | - |
| City of Arcadia - (WI) | - | - | - | - | - |
| Village of Trempealeau - (WI) | - | - | - | - | - |
| Whitehall Electric Utility | - | - | - | - | - |
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 ÷ 14,810 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. Trempealeau County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Trempealeau 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/trempealeau-county