County annual report · FIPS 26161
2017 Washtenaw County, MI Power Outage Report
In 2017, customers in Washtenaw County, MI went without power for an average of 3.3 hours, a total of 648K customer-hours (Michigan average 6.0 hours). That ranks 61st worst of 80 Michigan counties and 1246th of 2,786 nationally.
Compared with MI, the US and 2016
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Washtenaw County, 2017
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 3, 2017 13:00 | December 8, 2017 02:30 | 4d 13h | 7,209 | 27K |
| 2 | June 12, 2017 12:00 | June 15, 2017 06:30 | 2d 18h | 5,948 | 29K |
| 3 | April 26, 2017 16:15 | April 28, 2017 06:30 | 1d 14h | 5,572 | 53K |
| 4 | May 20, 2017 14:30 | May 22, 2017 08:30 | 1d 18h | 5,152 | 45K |
| 5 | April 6, 2017 17:30 | April 10, 2017 09:45 | 3d 16h | 4,646 | 13K |
| 6 | July 7, 2017 11:30 | July 10, 2017 00:45 | 2d 13h | 4,464 | 39K |
| 7 | April 10, 2017 11:30 | April 11, 2017 02:00 | 14h 30m | 3,714 | 12K |
| 8 | March 9, 2017 19:30 | March 10, 2017 16:30 | 21h | 3,498 | 55K |
| 9 | October 11, 2017 10:15 | October 13, 2017 04:15 | 1d 18h | 2,881 | 28K |
| 10 | October 14, 2017 15:15 | October 17, 2017 06:45 | 2d 15h | 2,821 | 21K |
Outage episodes by size in 2017: 100 reached 100+ customers, 31 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 Washtenaw County reported on EIA Form 861 for 2017, 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) | 2017 | 10.1 hrs | 1.31 | 2.7 hrs | 0.89 |
| DTE Electric Company | 2017 | 17.7 hrs | 1.39 | 3.3 hrs | 0.99 |
| 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 n/a of Michigan's customers in 2017; 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, 2017, 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/2017/michigan/washtenaw-county