County annual report · FIPS 26073
2021 Isabella County, MI Power Outage Report
In 2021, customers in Isabella County, MI went without power for an average of 9.6 hours, a total of 350K customer-hours (Michigan average 26.6 hours). That ranks 58th worst of 83 Michigan counties and 802nd 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 Isabella 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 | August 11, 2021 03:00 | August 16, 2021 03:45 | 5d | 6,851 | 98K |
| 2 | August 24, 2021 21:45 | August 27, 2021 21:15 | 2d 23h | 4,603 | 71K |
| 3 | December 11, 2021 11:45 | December 14, 2021 04:30 | 2d 16h | 3,256 | 50K |
| 4 | December 16, 2021 00:15 | December 18, 2021 06:45 | 2d 6h | 3,061 | 23K |
| 5 | March 11, 2021 14:30 | March 12, 2021 04:30 | 14h | 1,681 | 8,797 |
| 6 | June 16, 2021 18:15 | June 16, 2021 22:00 | 3h 45m | 1,454 | 5,090 |
| 7 | August 1, 2021 18:30 | August 1, 2021 21:30 | 3h | 1,448 | 1,450 |
| 8 | June 25, 2021 16:15 | June 27, 2021 18:00 | 2d 1h | 1,075 | 13K |
| 9 | August 22, 2021 02:45 | August 22, 2021 21:00 | 18h 15m | 1,068 | 11K |
| 10 | August 29, 2021 04:30 | August 30, 2021 02:00 | 21h 30m | 1,000 | 2,074 |
Outage episodes by size in 2021: 41 reached 100+ customers, 10 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 Isabella 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 |
| DTE Electric Company | 2021 | 15.5 hrs | 1.58 | 2.3 hrs | 0.92 |
| Tri-County Electric Coop (MI) | 2021 | 6.3 hrs | 1.63 | 2.5 hrs | 1.12 |
| Wolverine Power Supply Coop | - | - | - | - | - |
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 ÷ 36,507 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. Isabella County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Isabella 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/isabella-county