County annual report · FIPS 26147
2018 St. Clair County, MI Power Outage Report
In 2018, customers in St. Clair County, MI went without power for an average of 13.4 hours, a total of 957K customer-hours (Michigan average 10.0 hours). That ranks 20th worst of 80 Michigan counties and 420th of 2,798 nationally.
Compared with MI, the US and 2017
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in St. Clair County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 4, 2018 08:30 | May 11, 2018 05:45 | 6d 21h | 25,132 | 747K |
| 2 | March 28, 2018 18:00 | March 29, 2018 00:45 | 6h 45m | 6,580 | 4,590 |
| 3 | April 25, 2018 11:45 | April 27, 2018 10:00 | 1d 22h | 2,732 | 6,204 |
| 4 | March 20, 2018 12:45 | March 20, 2018 22:00 | 9h 15m | 2,712 | 7,050 |
| 5 | November 15, 2018 14:00 | November 16, 2018 20:00 | 1d 6h | 2,710 | 3,460 |
| 6 | October 17, 2018 13:30 | October 18, 2018 07:00 | 17h 30m | 2,574 | 3,385 |
| 7 | July 15, 2018 21:00 | July 18, 2018 23:15 | 3d 2h | 2,163 | 21K |
| 8 | September 21, 2018 11:45 | September 26, 2018 23:30 | 5d 11h | 2,125 | 11K |
| 9 | August 15, 2018 12:15 | August 16, 2018 04:00 | 15h 45m | 1,956 | 4,705 |
| 10 | April 13, 2018 12:30 | April 13, 2018 17:00 | 4h 30m | 1,827 | 1,445 |
Outage episodes by size in 2018: 93 reached 100+ customers, 19 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 St. Clair County reported on EIA Form 861 for 2018, 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 | 2018 | 8.1 hrs | 1.36 | 3.0 hrs | 1.04 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 91% of Michigan's customers in 2018; 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, 2018, 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/2018/michigan/st-clair-county