County annual report · FIPS 55121
2025 Trempealeau County, WI Power Outage Report
In 2025, customers in Trempealeau County, WI went without power for an average of 1.7 hours, a total of 25K customer-hours (Wisconsin average 3.9 hours). That ranks 49th worst of 72 Wisconsin counties and 2539th of 3,000 nationally.
Compared with WI, the US and 2024
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Trempealeau County, 2025
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 29, 2025 04:15 | July 29, 2025 17:15 | 13h | 1,071 | 4,337 |
| 2 | July 9, 2025 23:30 | July 10, 2025 01:30 | 2h | 582 | 1,164 |
| 3 | August 9, 2025 12:30 | August 10, 2025 05:00 | 16h 30m | 531 | 1,333 |
| 4 | July 6, 2025 00:00 | July 6, 2025 10:00 | 10h | 524 | 1,731 |
| 5 | January 30, 2025 20:45 | January 30, 2025 21:00 | 15m | 472 | 118 |
| 6 | September 21, 2025 00:45 | September 21, 2025 10:15 | 9h 30m | 406 | 3,857 |
| 7 | June 30, 2025 01:30 | June 30, 2025 08:00 | 6h 30m | 374 | 1,207 |
| 8 | January 16, 2025 13:15 | January 16, 2025 13:30 | 15m | 373 | 93 |
| 9 | March 20, 2025 14:45 | March 20, 2025 17:00 | 2h 15m | 328 | 285 |
| 10 | May 16, 2025 21:15 | May 16, 2025 22:30 | 1h 15m | 312 | 390 |
Outage episodes by size in 2025: 22 reached 100+ customers, 1 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 2025, 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 | 2024 | 3.1 hrs | 1.06 | 2.0 hrs | 0.81 |
| Riverland Energy Cooperative | 2024 | 4.4 hrs | 1.76 | 2.4 hrs | 1.38 |
| 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 n/a of Wisconsin's customers in 2025; 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, 2025, 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/2025/wisconsin/trempealeau-county