County annual report · FIPS 26105
2025 Mason County, MI Power Outage Report
In 2025, customers in Mason County, MI went without power for an average of 8.8 hours, a total of 166K customer-hours (Michigan average 12.9 hours). That ranks 55th worst of 83 Michigan counties and 917th 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 Mason 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 | March 20, 2025 08:45 | March 20, 2025 20:30 | 11h 45m | 4,184 | 10K |
| 2 | December 29, 2025 09:45 | December 31, 2025 17:45 | 2d 8h | 3,857 | 48K |
| 3 | March 15, 2025 15:15 | March 16, 2025 21:30 | 1d 6h | 3,385 | 25K |
| 4 | November 26, 2025 16:30 | November 28, 2025 03:30 | 1d 11h | 2,398 | 32K |
| 5 | February 6, 2025 17:45 | February 6, 2025 21:00 | 3h 15m | 2,094 | 4,228 |
| 6 | October 22, 2025 09:00 | October 22, 2025 10:15 | 1h 15m | 1,540 | 1,777 |
| 7 | October 18, 2025 11:30 | October 18, 2025 15:15 | 3h 45m | 1,289 | 1,377 |
| 8 | February 6, 2025 21:45 | February 7, 2025 22:45 | 1d 1h | 1,241 | 5,455 |
| 9 | June 22, 2025 19:15 | June 22, 2025 22:30 | 3h 15m | 1,182 | 2,067 |
| 10 | June 28, 2025 14:30 | June 28, 2025 16:15 | 1h 45m | 936 | 1,404 |
Outage episodes by size in 2025: 48 reached 100+ customers, 9 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 Mason 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 |
| Great Lakes Energy Coop | 2024 | 8.1 hrs | 2.83 | 4.3 hrs | 2.35 |
| 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 n/a of Michigan's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 18,909 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. Mason County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Mason 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/mason-county