County annual report · FIPS 26155
2025 Shiawassee County, MI Power Outage Report
In 2025, customers in Shiawassee County, MI went without power for an average of 15.9 hours, a total of 658K customer-hours (Michigan average 12.9 hours). That ranks 39th worst of 83 Michigan counties and 466th 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 Shiawassee 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 30, 2025 23:00 | April 6, 2025 05:45 | 6d 6h | 10,186 | 467K |
| 2 | July 4, 2025 08:00 | July 4, 2025 10:00 | 2h | 3,436 | 6,597 |
| 3 | March 15, 2025 09:30 | March 17, 2025 20:30 | 2d 11h | 3,347 | 25K |
| 4 | May 16, 2025 04:00 | May 20, 2025 20:30 | 4d 16h | 1,973 | 68K |
| 5 | July 12, 2025 16:30 | July 12, 2025 21:15 | 4h 45m | 1,148 | 1,628 |
| 6 | April 29, 2025 13:00 | April 30, 2025 20:00 | 1d 7h | 1,056 | 4,871 |
| 7 | May 1, 2025 20:15 | May 2, 2025 03:00 | 6h 45m | 1,008 | 3,188 |
| 8 | May 31, 2025 13:15 | May 31, 2025 18:45 | 5h 30m | 962 | 5,106 |
| 9 | July 2, 2025 23:45 | July 3, 2025 01:45 | 2h | 902 | 1,128 |
| 10 | June 27, 2025 03:30 | June 28, 2025 20:15 | 1d 16h | 864 | 8,788 |
Outage episodes by size in 2025: 52 reached 100+ customers, 7 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 Shiawassee 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 |
| DTE Electric Company | 2024 | 8.0 hrs | 1.25 | 2.7 hrs | 0.94 |
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 ÷ 41,361 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. Shiawassee County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Shiawassee 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/shiawassee-county