County annual report · FIPS 26025
2021 Calhoun County, MI Power Outage Report
In 2021, customers in Calhoun County, MI went without power for an average of 11.2 hours, a total of 1.0M customer-hours (Michigan average 26.6 hours). That ranks 56th worst of 83 Michigan counties and 716th 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 Calhoun 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 12, 2021 15:00 | August 18, 2021 22:30 | 6d 7h | 8,842 | 580K |
| 2 | August 11, 2021 01:45 | August 11, 2021 22:30 | 20h 45m | 8,627 | 56K |
| 3 | September 7, 2021 18:00 | September 10, 2021 03:45 | 2d 9h | 4,517 | 89K |
| 4 | November 2, 2021 14:00 | November 3, 2021 02:15 | 12h 15m | 4,227 | 12K |
| 5 | August 24, 2021 21:45 | August 26, 2021 09:30 | 1d 11h | 3,433 | 52K |
| 6 | December 11, 2021 06:15 | December 14, 2021 02:30 | 2d 20h | 2,729 | 42K |
| 7 | October 8, 2021 11:30 | October 9, 2021 02:30 | 15h | 2,645 | 7,342 |
| 8 | July 23, 2021 22:00 | July 24, 2021 00:45 | 2h 45m | 2,597 | 2,974 |
| 9 | October 15, 2021 13:30 | October 15, 2021 20:15 | 6h 45m | 2,366 | 2,391 |
| 10 | August 8, 2021 09:45 | August 8, 2021 14:15 | 4h 30m | 2,226 | 6,080 |
Outage episodes by size in 2021: 103 reached 100+ customers, 21 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 Calhoun 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 |
| City of Marshall - (MI) | - | - | - | - | - |
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 ÷ 92,794 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. Calhoun County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Calhoun 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/calhoun-county