County annual report · FIPS 26161
2023 Washtenaw County, MI Power Outage Report
In 2023, customers in Washtenaw County, MI went without power for an average of 57.3 hours, a total of 11.2M customer-hours (Michigan average 26.5 hours). That ranks 6th worst of 83 Michigan counties and 83rd of 2,977 nationally.
Compared with MI, the US and 2022
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Washtenaw County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | February 13, 2023 14:15 | March 24, 2023 14:45 | 39d | 79,028 | 7.4M |
| 2 | July 11, 2023 12:45 | September 5, 2023 05:30 | 55d 16h | 34,976 | 3.0M |
| 3 | June 25, 2023 11:00 | July 1, 2023 04:30 | 5d 17h | 11,980 | 331K |
| 4 | March 24, 2023 15:30 | May 27, 2023 03:30 | 63d 12h | 9,098 | 256K |
| 5 | November 13, 2023 12:30 | November 18, 2023 10:15 | 4d 21h | 2,998 | 15K |
| 6 | May 29, 2023 23:00 | June 11, 2023 12:15 | 12d 13h | 2,757 | 34K |
| 7 | January 24, 2023 20:30 | January 27, 2023 19:00 | 2d 22h | 2,635 | 4,821 |
| 8 | February 1, 2023 20:30 | February 4, 2023 06:15 | 2d 9h | 2,472 | 3,237 |
| 9 | June 21, 2023 03:45 | June 25, 2023 01:30 | 3d 21h | 2,342 | 12K |
| 10 | December 15, 2023 11:00 | December 16, 2023 05:30 | 18h 30m | 2,272 | 9,296 |
Outage episodes by size in 2023: 59 reached 100+ customers, 15 reached 1,000+ customers, 3 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 2023, 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) | 2023 | 15.2 hrs | 1.37 | 2.9 hrs | 0.96 |
| DTE Electric Company | 2023 | 25.7 hrs | 1.72 | 2.6 hrs | 0.85 |
| 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 2023; 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, 2023, 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/2023/michigan/washtenaw-county