County annual report · FIPS 26067
2021 Ionia County, MI Power Outage Report
In 2021, customers in Ionia County, MI went without power for an average of 14.3 hours, a total of 503K customer-hours (Michigan average 26.6 hours). That ranks 51st worst of 83 Michigan counties and 589th 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 Ionia 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 18, 2021 01:15 | August 18, 2021 04:30 | 3h 15m | 4,856 | 11K |
| 2 | August 11, 2021 03:00 | August 12, 2021 00:15 | 21h 15m | 4,676 | 85K |
| 3 | December 11, 2021 13:15 | December 15, 2021 04:30 | 3d 15h | 3,694 | 138K |
| 4 | August 12, 2021 02:30 | August 15, 2021 23:15 | 3d 20h | 2,958 | 104K |
| 5 | November 21, 2021 23:30 | November 23, 2021 04:30 | 1d 5h | 2,276 | 24K |
| 6 | August 24, 2021 22:00 | August 26, 2021 16:30 | 1d 18h | 1,768 | 28K |
| 7 | June 11, 2021 22:00 | June 13, 2021 09:45 | 1d 11h | 1,455 | 21K |
| 8 | March 18, 2021 13:45 | March 19, 2021 08:00 | 18h 15m | 1,387 | 3,757 |
| 9 | October 25, 2021 22:00 | October 26, 2021 05:45 | 7h 45m | 1,076 | 1,560 |
| 10 | August 29, 2021 17:15 | August 30, 2021 04:00 | 10h 45m | 993 | 3,584 |
Outage episodes by size in 2021: 61 reached 100+ customers, 9 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 Ionia 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 |
| Tri-County Electric Coop (MI) | 2021 | 6.3 hrs | 1.63 | 2.5 hrs | 1.12 |
| Wolverine Power Supply Coop | - | - | - | - | - |
| City of Portland - (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 ÷ 35,242 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. Ionia County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Ionia 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/ionia-county