County annual report · FIPS 26161
2019 Washtenaw County, MI Power Outage Report
In 2019, customers in Washtenaw County, MI went without power for an average of 13.5 hours, a total of 2.6M customer-hours (Michigan average 12.7 hours). That ranks 29th worst of 83 Michigan counties and 395th of 2,945 nationally.
Compared with MI, the US and 2018
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Washtenaw County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 16, 2019 22:00 | July 27, 2019 18:15 | 10d 20h | 36,636 | 1.6M |
| 2 | September 11, 2019 04:00 | September 17, 2019 07:30 | 6d 3h | 8,199 | 191K |
| 3 | October 18, 2019 14:45 | October 20, 2019 03:00 | 1d 12h | 7,122 | 16K |
| 4 | September 19, 2019 11:30 | October 9, 2019 01:15 | 19d 13h | 5,982 | 64K |
| 5 | September 5, 2019 11:45 | September 8, 2019 07:45 | 2d 20h | 5,357 | 15K |
| 6 | October 26, 2019 20:30 | October 31, 2019 09:00 | 4d 12h | 5,094 | 62K |
| 7 | February 23, 2019 13:45 | February 27, 2019 11:00 | 3d 21h | 4,941 | 116K |
| 8 | November 27, 2019 04:15 | November 30, 2019 09:30 | 3d 5h | 4,833 | 57K |
| 9 | March 16, 2019 13:45 | March 19, 2019 10:00 | 2d 20h | 4,650 | 32K |
| 10 | February 12, 2019 11:30 | February 13, 2019 15:30 | 1d 4h | 3,476 | 16K |
Outage episodes by size in 2019: 91 reached 100+ customers, 40 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 Washtenaw County reported on EIA Form 861 for 2019, 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 96% of Michigan's customers in 2019; 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, 2019, 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/2019/michigan/washtenaw-county