County annual report · FIPS 26131
2025 Ontonagon County, MI Power Outage Report
In 2025, customers in Ontonagon County, MI went without power for an average of 16.4 hours, a total of 70K customer-hours (Michigan average 12.9 hours). That ranks 38th worst of 83 Michigan counties and 450th of 3,000 nationally.
Compared with MI, the US and 2024
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Ontonagon 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 | November 26, 2025 08:30 | November 29, 2025 17:30 | 3d 9h | 2,384 | 48K |
| 2 | November 3, 2025 17:45 | November 4, 2025 02:00 | 8h 15m | 1,649 | 1,975 |
| 3 | September 3, 2025 12:15 | September 3, 2025 14:15 | 2h | 1,269 | 1,906 |
| 4 | May 15, 2025 22:30 | May 16, 2025 09:30 | 11h | 1,207 | 1,603 |
| 5 | January 23, 2025 16:30 | January 23, 2025 21:15 | 4h 45m | 684 | 175 |
| 6 | December 29, 2025 00:30 | December 29, 2025 19:45 | 19h 15m | 680 | 4,183 |
| 7 | October 5, 2025 17:15 | October 6, 2025 00:30 | 7h 15m | 652 | 3,806 |
| 8 | May 6, 2025 22:15 | May 7, 2025 04:30 | 6h 15m | 224 | 467 |
| 9 | November 4, 2025 18:00 | November 4, 2025 20:15 | 2h 15m | 217 | 109 |
| 10 | June 18, 2025 13:45 | June 22, 2025 01:45 | 3d 12h | 187 | 688 |
Outage episodes by size in 2025: 24 reached 100+ customers, 4 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 Ontonagon 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 |
| Upper Peninsula Power Company | 2024 | 6.7 hrs | 1.65 | 3.1 hrs | 1.26 |
| Upper Michigan Energy Resources Corp. | 2024 | 18.0 hrs | 1.71 | 3.6 hrs | 1.02 |
| Ontonagon County R E A | - | - | - | - | - |
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 Michigan's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,246 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. Ontonagon County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Ontonagon County, MI 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/michigan/ontonagon-county