County annual report · FIPS 26027
2021 Cass County, MI Power Outage Report
In 2021, customers in Cass County, MI went without power for an average of 155.3 hours, a total of 532K customer-hours (Michigan average 26.6 hours). That ranks 1st worst of 83 Michigan counties and 37th 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 Cass 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 | January 1, 2021 19:30 | January 5, 2021 04:00 | 3d 8h | 5,837 | 66K |
| 2 | September 25, 2021 16:30 | September 26, 2021 14:15 | 21h 45m | 4,959 | 21K |
| 3 | June 19, 2021 23:30 | June 22, 2021 21:30 | 2d 22h | 4,687 | 57K |
| 4 | August 10, 2021 21:15 | August 16, 2021 22:15 | 6d 1h | 4,566 | 92K |
| 5 | December 11, 2021 10:45 | December 13, 2021 02:30 | 1d 15h | 3,195 | 27K |
| 6 | June 18, 2021 11:00 | June 19, 2021 05:00 | 18h | 2,729 | 11K |
| 7 | June 26, 2021 07:15 | June 28, 2021 06:00 | 1d 22h | 2,537 | 34K |
| 8 | June 7, 2021 15:15 | June 8, 2021 06:00 | 14h 45m | 2,136 | 9,001 |
| 9 | October 11, 2021 21:00 | October 13, 2021 18:45 | 1d 21h | 2,106 | 30K |
| 10 | February 18, 2021 13:30 | February 18, 2021 22:30 | 9h | 1,756 | 8,702 |
Outage episodes by size in 2021: 110 reached 100+ customers, 18 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 Cass 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 |
|---|---|---|---|---|---|
| Indiana Michigan Power Co | 2021 | 11.2 hrs | 1.57 | 3.8 hrs | 1.09 |
| Midwest Energy Cooperative - (MI) | 2014 | 9.8 hrs | 2.23 | 4.9 hrs | 1.87 |
| Wolverine Power Supply Coop | - | - | - | - | - |
| City of Dowagiac | - | - | - | - | - |
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 ÷ 3,423 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. Cass County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Cass 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/cass-county