County annual report · FIPS 26161
2015 Washtenaw County, MI Power Outage Report
In 2015, customers in Washtenaw County, MI went without power for an average of 4.5 hours, a total of 887K customer-hours (Michigan average 6.8 hours). That ranks 45th worst of 80 Michigan counties and 623rd of 2,484 nationally.
Compared with MI, the US
Coverage line is EAGLE-I's share of Michigan customers tracked each year.
Biggest outages in Washtenaw County, 2015
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, 2015 08:30 | June 13, 2015 02:15 | 2d 17h | 8,785 | 22K |
| 2 | June 22, 2015 11:45 | June 29, 2015 09:00 | 6d 21h | 7,533 | 168K |
| 3 | December 28, 2015 14:15 | December 31, 2015 00:15 | 2d 10h | 6,066 | 104K |
| 4 | July 1, 2015 23:45 | July 4, 2015 06:00 | 2d 6h | 4,981 | 10K |
| 5 | November 21, 2015 11:30 | November 25, 2015 02:45 | 3d 15h | 4,699 | 37K |
| 6 | February 20, 2015 15:00 | February 21, 2015 01:15 | 10h 15m | 4,469 | 1,148 |
| 7 | August 1, 2015 19:00 | August 4, 2015 17:30 | 2d 22h | 4,374 | 64K |
| 8 | May 5, 2015 17:45 | May 6, 2015 21:45 | 1d 4h | 3,846 | 15K |
| 9 | November 19, 2015 13:00 | November 20, 2015 06:15 | 17h 15m | 3,402 | 13K |
| 10 | January 7, 2015 23:30 | January 9, 2015 20:30 | 1d 21h | 3,268 | 9,214 |
Outage episodes by size in 2015: 107 reached 100+ customers, 44 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 2015, 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) | 2015 | 7.3 hrs | 1.18 | 3.0 hrs | 0.98 |
| DTE Electric Company | 2015 | 4.6 hrs | 1.00 | 3.1 hrs | 0.91 |
| 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 2015; 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, 2015, 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/2015/michigan/washtenaw-county