County annual report · FIPS 26161
2018 Washtenaw County, MI Power Outage Report
In 2018, customers in Washtenaw County, MI went without power for an average of 10.3 hours, a total of 2.0M customer-hours (Michigan average 10.0 hours). That ranks 26th worst of 80 Michigan counties and 531st 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 Washtenaw 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 | April 12, 2018 13:45 | April 21, 2018 14:15 | 9d | 27,714 | 414K |
| 2 | July 25, 2018 12:15 | August 4, 2018 02:00 | 9d 13h | 19,257 | 464K |
| 3 | March 1, 2018 12:30 | March 6, 2018 01:00 | 4d 12h | 9,667 | 218K |
| 4 | April 30, 2018 12:45 | May 11, 2018 06:30 | 10d 17h | 7,440 | 131K |
| 5 | June 29, 2018 11:00 | July 6, 2018 23:00 | 7d 12h | 5,396 | 44K |
| 6 | May 27, 2018 10:15 | June 4, 2018 09:30 | 7d 23h | 5,379 | 111K |
| 7 | November 24, 2018 01:45 | November 26, 2018 06:45 | 2d 5h | 4,882 | 12K |
| 8 | October 20, 2018 05:15 | October 25, 2018 05:30 | 5d | 4,786 | 82K |
| 9 | January 10, 2018 16:45 | January 14, 2018 02:15 | 3d 9h | 3,924 | 15K |
| 10 | June 16, 2018 08:45 | June 27, 2018 00:15 | 10d 15h | 3,660 | 95K |
Outage episodes by size in 2018: 103 reached 100+ customers, 35 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 Washtenaw 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 |
|---|---|---|---|---|---|
| Consumers Energy Co - (MI) | 2018 | 6.8 hrs | 1.29 | 3.3 hrs | 1.02 |
| DTE Electric Company | 2018 | 8.1 hrs | 1.36 | 3.0 hrs | 1.04 |
| Village of Clinton - (MI) | - | - | - | - | - |
| Village of Chelsea - (MI) | - | - | - | - | - |
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 ÷ 195,553 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. Washtenaw County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Washtenaw 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/washtenaw-county