County annual report · FIPS 26105
2021 Mason County, MI Power Outage Report
In 2021, customers in Mason County, MI went without power for an average of 22.6 hours, a total of 426K customer-hours (Michigan average 26.6 hours). That ranks 41st worst of 83 Michigan counties and 382nd 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 Mason 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 02:15 | August 17, 2021 03:00 | 6d | 11,073 | 271K |
| 2 | December 16, 2021 01:00 | December 19, 2021 03:15 | 3d 2h | 4,118 | 61K |
| 3 | June 18, 2021 07:45 | June 19, 2021 02:15 | 18h 30m | 3,375 | 19K |
| 4 | November 21, 2021 22:00 | November 22, 2021 18:15 | 20h 15m | 2,086 | 6,104 |
| 5 | March 17, 2021 21:30 | March 18, 2021 00:45 | 3h 15m | 1,887 | 5,003 |
| 6 | September 25, 2021 02:00 | September 25, 2021 15:30 | 13h 30m | 1,473 | 12K |
| 7 | August 24, 2021 14:30 | August 25, 2021 17:00 | 1d 2h | 1,459 | 4,884 |
| 8 | August 28, 2021 05:45 | August 28, 2021 21:00 | 15h 15m | 1,269 | 6,005 |
| 9 | November 30, 2021 14:00 | November 30, 2021 18:00 | 4h | 1,114 | 1,224 |
| 10 | October 28, 2021 13:45 | October 28, 2021 16:00 | 2h 15m | 1,101 | 834 |
Outage episodes by size in 2021: 53 reached 100+ customers, 10 reached 1,000+ customers, 1 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 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 |
| Great Lakes Energy Coop | 2021 | 20.4 hrs | 3.25 | 3.4 hrs | 1.71 |
| 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 ÷ 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, 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/mason-county