County annual report · FIPS 55097
2025 Portage County, WI Power Outage Report
In 2025, customers in Portage County, WI went without power for an average of 4.9 hours, a total of 133K customer-hours (Wisconsin average 3.9 hours). That ranks 18th worst of 72 Wisconsin counties and 1518th 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 Portage 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 | April 21, 2025 08:15 | April 21, 2025 11:00 | 2h 45m | 4,843 | 7,267 |
| 2 | March 30, 2025 08:45 | April 2, 2025 00:45 | 2d 16h | 4,781 | 59K |
| 3 | June 23, 2025 11:15 | June 23, 2025 12:30 | 1h 15m | 2,974 | 2,879 |
| 4 | March 23, 2025 19:45 | March 25, 2025 06:15 | 1d 10h | 2,604 | 14K |
| 5 | June 23, 2025 19:30 | June 24, 2025 07:45 | 12h 15m | 2,379 | 3,106 |
| 6 | December 29, 2025 04:30 | December 29, 2025 11:15 | 6h 45m | 2,290 | 1,818 |
| 7 | July 23, 2025 22:00 | July 29, 2025 00:15 | 5d 2h | 2,283 | 4,628 |
| 8 | November 19, 2025 20:15 | November 19, 2025 22:45 | 2h 30m | 2,225 | 1,230 |
| 9 | May 28, 2025 12:15 | May 28, 2025 18:30 | 6h 15m | 1,873 | 5,521 |
| 10 | June 26, 2025 00:45 | June 26, 2025 09:00 | 8h 15m | 1,838 | 4,030 |
Outage episodes by size in 2025: 35 reached 100+ customers, 12 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 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 |
|---|---|---|---|---|---|
| Wisconsin Public Service Corp | 2024 | 7.8 hrs | 1.22 | 1.6 hrs | 0.77 |
| Adams-Columbia Electric Coop | 2024 | 2.3 hrs | 1.15 | 2.3 hrs | 1.15 |
| 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 n/a of Wisconsin's customers in 2025; 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, 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/portage-county