County annual report · FIPS 26155
2021 Shiawassee County, MI Power Outage Report
In 2021, customers in Shiawassee County, MI went without power for an average of 4.1 hours, a total of 170K customer-hours (Michigan average 26.6 hours). That ranks 76th worst of 83 Michigan counties and 1513th 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 Shiawassee 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 17, 2021 22:00 | 5d 7h | 5,883 | 29K |
| 2 | June 11, 2021 19:30 | June 13, 2021 23:45 | 2d 4h | 2,698 | 24K |
| 3 | April 8, 2021 20:15 | April 9, 2021 22:45 | 1d 2h | 2,491 | 2,309 |
| 4 | December 11, 2021 14:15 | December 14, 2021 21:15 | 3d 7h | 1,710 | 28K |
| 5 | September 22, 2021 18:45 | September 23, 2021 22:45 | 1d 4h | 1,535 | 2,547 |
| 6 | September 1, 2021 09:00 | September 1, 2021 12:45 | 3h 45m | 1,506 | 4,892 |
| 7 | July 20, 2021 22:30 | July 21, 2021 06:00 | 7h 30m | 1,283 | 4,362 |
| 8 | December 19, 2021 02:00 | December 19, 2021 16:15 | 14h 15m | 1,235 | 5,878 |
| 9 | April 2, 2021 02:30 | April 2, 2021 05:15 | 2h 45m | 1,078 | 2,428 |
| 10 | April 24, 2021 04:15 | April 24, 2021 13:00 | 8h 45m | 967 | 8,218 |
Outage episodes by size in 2021: 44 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 Shiawassee 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 |
| DTE Electric Company | 2021 | 15.5 hrs | 1.58 | 2.3 hrs | 0.92 |
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 ÷ 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, 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/shiawassee-county