County annual report · FIPS 26161
2020 Washtenaw County, MI Power Outage Report
In 2020, customers in Washtenaw County, MI went without power for an average of 7.0 hours, a total of 1.4M customer-hours (Michigan average 9.8 hours). That ranks 54th worst of 83 Michigan counties and 1095th of 3,019 nationally.
Compared with MI, the US and 2019
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Washtenaw County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 10, 2020 00:15 | June 17, 2020 05:45 | 7d 5h | 18,692 | 120K |
| 2 | July 15, 2020 16:00 | July 25, 2020 08:30 | 9d 16h | 10,539 | 208K |
| 3 | June 26, 2020 19:00 | June 28, 2020 23:30 | 2d 4h | 10,397 | 166K |
| 4 | September 24, 2020 10:15 | September 25, 2020 16:45 | 1d 6h | 8,279 | 16K |
| 5 | August 27, 2020 17:45 | September 1, 2020 10:30 | 4d 16h | 7,925 | 70K |
| 6 | November 15, 2020 07:30 | November 20, 2020 04:30 | 4d 21h | 7,790 | 226K |
| 7 | March 29, 2020 04:45 | March 30, 2020 21:30 | 1d 16h | 7,327 | 35K |
| 8 | April 13, 2020 11:00 | April 14, 2020 03:00 | 16h | 3,914 | 12K |
| 9 | July 6, 2020 11:15 | July 14, 2020 03:15 | 7d 16h | 3,638 | 105K |
| 10 | October 7, 2020 16:30 | October 8, 2020 09:15 | 16h 45m | 3,442 | 13K |
Outage episodes by size in 2020: 149 reached 100+ customers, 42 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 2020, 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) | 2020 | 8.5 hrs | 1.35 | 3.2 hrs | 1.03 |
| DTE Electric Company | 2020 | 5.9 hrs | 1.29 | 2.4 hrs | 1.01 |
| 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 95% of Michigan's customers in 2020; 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, 2020, 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/2020/michigan/washtenaw-county