County annual report · FIPS 26147
2021 St. Clair County, MI Power Outage Report
In 2021, customers in St. Clair County, MI went without power for an average of 37.3 hours, a total of 2.7M customer-hours (Michigan average 26.6 hours). That ranks 25th worst of 83 Michigan counties and 239th 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 St. Clair 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 | September 22, 2021 00:15 | September 29, 2021 05:15 | 7d 5h | 30,637 | 1.4M |
| 2 | December 11, 2021 14:00 | December 18, 2021 02:30 | 6d 12h | 12,637 | 357K |
| 3 | August 11, 2021 22:15 | August 20, 2021 06:45 | 8d 8h | 9,590 | 321K |
| 4 | August 22, 2021 15:45 | September 2, 2021 05:00 | 10d 13h | 9,261 | 243K |
| 5 | September 12, 2021 22:30 | September 17, 2021 10:00 | 4d 11h | 5,649 | 41K |
| 6 | July 4, 2021 19:00 | July 12, 2021 06:00 | 7d 11h | 5,372 | 125K |
| 7 | August 7, 2021 13:30 | August 11, 2021 20:45 | 4d 7h | 2,780 | 23K |
| 8 | June 21, 2021 00:45 | June 23, 2021 02:00 | 2d 1h | 2,487 | 24K |
| 9 | June 23, 2021 11:00 | June 24, 2021 09:30 | 22h 30m | 2,124 | 8,298 |
| 10 | June 25, 2021 19:45 | July 4, 2021 02:15 | 8d 6h | 1,802 | 53K |
Outage episodes by size in 2021: 80 reached 100+ customers, 22 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 St. Clair 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 |
|---|---|---|---|---|---|
| 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 ÷ 71,469 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. St. Clair County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), St. Clair 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/st-clair-county