County annual report · FIPS 26131
2021 Ontonagon County, MI Power Outage Report
In 2021, customers in Ontonagon County, MI went without power for an average of 4.7 hours, a total of 20K customer-hours (Michigan average 26.6 hours). That ranks 74th worst of 83 Michigan counties and 1386th of 2,974 nationally.
Compared with MI, the US and 2020
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Ontonagon 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 | July 27, 2021 02:45 | July 29, 2021 18:30 | 2d 15h | 695 | 13K |
| 2 | March 22, 2021 12:00 | March 22, 2021 14:45 | 2h 45m | 637 | 1,720 |
| 3 | July 4, 2021 06:45 | July 4, 2021 07:45 | 1h | 439 | 331 |
| 4 | September 16, 2021 14:45 | September 16, 2021 16:45 | 2h | 433 | 218 |
| 5 | April 22, 2021 14:15 | April 22, 2021 16:15 | 2h | 313 | 579 |
| 6 | March 2, 2021 15:30 | March 2, 2021 19:45 | 4h 15m | 310 | 621 |
| 7 | August 10, 2021 18:30 | August 10, 2021 20:30 | 2h | 208 | 124 |
| 8 | May 26, 2021 10:15 | May 26, 2021 12:30 | 2h 15m | 193 | 386 |
| 9 | April 7, 2021 11:30 | April 7, 2021 14:00 | 2h 30m | 127 | 286 |
| 10 | May 21, 2021 09:15 | May 21, 2021 12:00 | 2h 45m | 123 | 247 |
Outage episodes by size in 2021: 11 reached 100+ customers, 0 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 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 |
| Upper Peninsula Power Company | 2021 | 4.6 hrs | 1.48 | 2.5 hrs | 1.16 |
| Upper Michigan Energy Resources Corp. | 2021 | 13.0 hrs | 2.15 | 4.0 hrs | 1.50 |
| 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 95% of Michigan's customers in 2021; 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, 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/michigan/ontonagon-county