County annual report · FIPS 19039
2021 Clarke County, IA Power Outage Report
In 2021, customers in Clarke County, IA went without power for an average of 2.7 hours, a total of 11K customer-hours (Iowa average 2.7 hours). That ranks 52nd worst of 99 Iowa counties and 1978th of 2,974 nationally.
Compared with IA, the US and 2020
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Clarke 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 | January 11, 2021 19:15 | January 11, 2021 19:30 | 15m | 907 | 227 |
| 2 | October 1, 2021 01:45 | October 1, 2021 03:15 | 1h 30m | 819 | 1,228 |
| 3 | December 15, 2021 23:30 | December 17, 2021 11:30 | 1d 12h | 693 | 6,835 |
| 4 | May 19, 2021 18:45 | May 19, 2021 19:15 | 30m | 485 | 243 |
| 5 | August 25, 2021 09:15 | August 25, 2021 13:45 | 4h 30m | 358 | 113 |
| 6 | April 16, 2021 18:45 | April 16, 2021 20:15 | 1h 30m | 112 | 57 |
| 7 | April 28, 2021 19:15 | April 28, 2021 19:45 | 30m | 85 | 43 |
| 8 | September 10, 2021 17:45 | September 10, 2021 18:30 | 45m | 85 | 43 |
| 9 | October 24, 2021 07:00 | October 24, 2021 09:30 | 2h 30m | 77 | 136 |
| 10 | December 29, 2021 02:15 | December 29, 2021 03:45 | 1h 30m | 69 | 87 |
Outage episodes by size in 2021: 6 reached 100+ customers, 0 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 Clarke 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 |
|---|---|---|---|---|---|
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Clarke Electric Coop Inc - (IA) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 91% of Iowa's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,290 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. Clarke County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Clarke County, IA 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/). https://massoutage.com/reports/2021/iowa/clarke-county