County annual report · FIPS 26069
2021 Iosco County, MI Power Outage Report
In 2021, customers in Iosco County, MI went without power for an average of 38.5 hours, a total of 551K customer-hours (Michigan average 26.6 hours). That ranks 24th worst of 83 Michigan counties and 228th 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 Iosco 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 17:30 | December 20, 2021 21:00 | 4d 3h | 6,309 | 232K |
| 2 | August 24, 2021 23:00 | August 25, 2021 23:15 | 1d | 4,870 | 27K |
| 3 | December 16, 2021 07:45 | December 16, 2021 16:30 | 8h 45m | 3,562 | 7,640 |
| 4 | December 11, 2021 04:30 | December 15, 2021 00:00 | 3d 19h | 3,220 | 80K |
| 5 | September 22, 2021 20:30 | September 24, 2021 18:00 | 1d 21h | 2,623 | 19K |
| 6 | December 23, 2021 04:15 | December 23, 2021 08:00 | 3h 45m | 2,486 | 7,970 |
| 7 | May 16, 2021 10:00 | May 16, 2021 22:30 | 12h 30m | 2,045 | 23K |
| 8 | August 28, 2021 14:00 | August 31, 2021 05:45 | 2d 15h | 1,503 | 26K |
| 9 | April 30, 2021 15:30 | May 1, 2021 02:00 | 10h 30m | 1,419 | 4,052 |
| 10 | June 13, 2021 00:15 | June 13, 2021 18:45 | 18h 30m | 1,406 | 10K |
Outage episodes by size in 2021: 55 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 Iosco 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 |
|---|---|---|---|---|---|
| Consumers Energy Co - (MI) | 2021 | 15.2 hrs | 1.60 | 3.8 hrs | 1.05 |
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 ÷ 14,310 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. Iosco County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Iosco 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/iosco-county