County annual report · FIPS 55019
2021 Clark County, WI Power Outage Report
In 2021, customers in Clark County, WI went without power for an average of 5.3 hours, a total of 84K customer-hours (Wisconsin average 4.7 hours). That ranks 18th worst of 72 Wisconsin counties and 1281st 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 Clark 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 03:30 | December 18, 2021 19:45 | 2d 16h | 4,358 | 73K |
| 2 | August 24, 2021 13:00 | August 25, 2021 03:45 | 14h 45m | 1,115 | 5,629 |
| 3 | April 6, 2021 21:15 | April 7, 2021 02:00 | 4h 45m | 503 | 741 |
| 4 | June 11, 2021 01:00 | June 11, 2021 03:45 | 2h 45m | 348 | 458 |
| 5 | August 31, 2021 00:45 | August 31, 2021 03:00 | 2h 15m | 258 | 580 |
| 6 | March 8, 2021 10:30 | March 8, 2021 17:15 | 6h 45m | 174 | 1,034 |
| 7 | June 2, 2021 11:45 | June 2, 2021 12:45 | 1h | 172 | 86 |
| 8 | July 6, 2021 21:00 | July 7, 2021 04:00 | 7h | 163 | 337 |
| 9 | November 3, 2021 14:00 | November 3, 2021 14:45 | 45m | 142 | 107 |
| 10 | May 25, 2021 22:45 | May 26, 2021 08:45 | 10h | 91 | 171 |
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 Clark 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 |
| Taylor Electric Coop - (WI) | 2018 | 80 min | - | 46 min | - |
| City of Marshfield - (WI) | 2021 | 26 min | 0.26 | 13 min | 0.16 |
| Eau Claire Electric Coop | - | - | - | - | - |
| Clark Electric Coop - (WI) | - | - | - | - | - |
| Jackson Electric Coop, Inc - (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 ÷ 15,996 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. Clark County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Clark 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/clark-county