County annual report · FIPS 26161
2021 Washtenaw County, MI Power Outage Report
In 2021, customers in Washtenaw County, MI went without power for an average of 29.8 hours, a total of 5.8M customer-hours (Michigan average 26.6 hours). That ranks 31st worst of 83 Michigan counties and 298th of 2,974 nationally.
Compared with MI, the US and 2020
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Washtenaw County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 9, 2021 00:00 | September 4, 2021 09:00 | 26d 9h | 68,416 | 4.6M |
| 2 | December 11, 2021 13:45 | December 15, 2021 10:00 | 3d 20h | 12,262 | 324K |
| 3 | September 13, 2021 05:00 | September 29, 2021 22:00 | 16d 17h | 8,053 | 349K |
| 4 | June 25, 2021 11:00 | July 2, 2021 06:00 | 6d 19h | 4,932 | 57K |
| 5 | July 20, 2021 14:00 | July 22, 2021 10:30 | 1d 20h | 4,903 | 33K |
| 6 | June 20, 2021 12:00 | June 23, 2021 19:15 | 3d 7h | 4,217 | 47K |
| 7 | July 4, 2021 21:30 | July 5, 2021 19:45 | 22h 15m | 4,015 | 19K |
| 8 | June 7, 2021 11:00 | June 9, 2021 19:15 | 2d 8h | 4,011 | 6,023 |
| 9 | October 29, 2021 11:45 | October 31, 2021 03:30 | 1d 15h | 3,960 | 25K |
| 10 | January 15, 2021 15:15 | January 16, 2021 03:00 | 11h 45m | 3,372 | 4,925 |
Outage episodes by size in 2021: 130 reached 100+ customers, 45 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 2021, 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) | 2021 | 15.2 hrs | 1.60 | 3.8 hrs | 1.05 |
| DTE Electric Company | 2021 | 15.5 hrs | 1.58 | 2.3 hrs | 0.92 |
| 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 2021; 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, 2021, 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/2021/michigan/washtenaw-county