County annual report · FIPS 19101
2021 Jefferson County, IA Power Outage Report
In 2021, customers in Jefferson County, IA went without power for an average of 2.7 hours, a total of 19K customer-hours (Iowa average 2.7 hours). That ranks 50th worst of 99 Iowa counties and 1955th 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 Jefferson 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 | September 3, 2021 16:45 | September 3, 2021 20:45 | 4h | 1,317 | 705 |
| 2 | September 21, 2021 00:30 | September 21, 2021 21:30 | 21h | 1,171 | 3,036 |
| 3 | June 19, 2021 05:30 | June 19, 2021 18:30 | 13h | 1,054 | 1,724 |
| 4 | December 16, 2021 02:30 | December 16, 2021 13:45 | 11h 15m | 854 | 3,847 |
| 5 | October 11, 2021 04:30 | October 11, 2021 07:00 | 2h 30m | 812 | 1,853 |
| 6 | September 13, 2021 06:00 | September 13, 2021 11:00 | 5h | 647 | 1,432 |
| 7 | July 10, 2021 09:30 | July 10, 2021 11:30 | 2h | 230 | 346 |
| 8 | February 4, 2021 18:15 | February 5, 2021 00:30 | 6h 15m | 201 | 619 |
| 9 | April 9, 2021 03:30 | April 9, 2021 08:45 | 5h 15m | 189 | 992 |
| 10 | August 13, 2021 08:45 | August 13, 2021 11:30 | 2h 45m | 189 | 131 |
Outage episodes by size in 2021: 13 reached 100+ customers, 3 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 Jefferson 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 |
|---|---|---|---|---|---|
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Access Energy Coop | - | - | - | - | - |
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 ÷ 6,879 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. Jefferson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Jefferson 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/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/iowa/jefferson-county