County annual report · FIPS 26025
2025 Calhoun County, MI Power Outage Report
In 2025, customers in Calhoun County, MI went without power for an average of 21.0 hours, a total of 1.9M customer-hours (Michigan average 12.9 hours). That ranks 31st worst of 83 Michigan counties and 328th of 3,000 nationally.
Compared with MI, the US and 2024
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Calhoun County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 15, 2025 23:30 | May 22, 2025 15:15 | 6d 15h | 21,889 | 1.1M |
| 2 | March 30, 2025 21:45 | April 6, 2025 16:30 | 6d 18h | 13,044 | 608K |
| 3 | February 27, 2025 13:15 | February 27, 2025 23:45 | 10h 30m | 5,183 | 29K |
| 4 | December 14, 2025 06:15 | December 14, 2025 10:45 | 4h 30m | 4,555 | 16K |
| 5 | June 23, 2025 12:15 | June 26, 2025 12:30 | 3d | 2,702 | 22K |
| 6 | March 15, 2025 09:00 | March 17, 2025 01:30 | 1d 16h | 1,443 | 23K |
| 7 | June 26, 2025 13:30 | June 27, 2025 16:00 | 1d 2h | 1,405 | 9,162 |
| 8 | June 18, 2025 22:00 | June 20, 2025 04:15 | 1d 6h | 1,352 | 10K |
| 9 | July 5, 2025 17:00 | July 5, 2025 20:45 | 3h 45m | 1,263 | 2,513 |
| 10 | July 28, 2025 10:45 | July 30, 2025 00:45 | 1d 14h | 1,214 | 8,342 |
Outage episodes by size in 2025: 103 reached 100+ customers, 16 reached 1,000+ customers, 2 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 2025, 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) | 2024 | 8.4 hrs | 1.32 | 2.6 hrs | 0.88 |
| 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 n/a of Michigan's customers in 2025; 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, 2025, 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/2025/michigan/calhoun-county