County annual report · FIPS 19103
2021 Johnson County, IA Power Outage Report
In 2021, customers in Johnson County, IA went without power for an average of 1.5 hours, a total of 119K customer-hours (Iowa average 2.7 hours). That ranks 79th worst of 99 Iowa counties and 2458th 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 Johnson 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 30, 2021 17:15 | January 31, 2021 01:30 | 8h 15m | 5,738 | 11K |
| 2 | May 9, 2021 04:30 | May 9, 2021 14:30 | 10h | 3,410 | 5,056 |
| 3 | September 6, 2021 06:15 | September 6, 2021 07:45 | 1h 30m | 3,354 | 2,275 |
| 4 | May 15, 2021 08:00 | May 15, 2021 10:30 | 2h 30m | 2,540 | 5,138 |
| 5 | March 11, 2021 02:30 | March 11, 2021 05:00 | 2h 30m | 2,148 | 3,765 |
| 6 | December 16, 2021 02:30 | December 17, 2021 02:15 | 23h 45m | 2,085 | 8,514 |
| 7 | September 18, 2021 12:15 | September 18, 2021 13:45 | 1h 30m | 1,879 | 1,439 |
| 8 | May 1, 2021 20:15 | May 3, 2021 19:15 | 1d 23h | 1,873 | 1,884 |
| 9 | June 18, 2021 13:15 | June 18, 2021 18:15 | 5h | 1,864 | 1,602 |
| 10 | September 26, 2021 20:45 | September 27, 2021 03:00 | 6h 15m | 1,758 | 3,420 |
Outage episodes by size in 2021: 94 reached 100+ customers, 16 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 Johnson 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 |
|---|---|---|---|---|---|
| MidAmerican Energy Co | 2021 | 1.9 hrs | 1.04 | 75 min | 0.74 |
| Eastern Iowa Light & Power Coop | 2021 | 2.1 hrs | 1.31 | 1.8 hrs | 1.22 |
| East-Central Iowa Rural Elec Coop | 2021 | 1.7 hrs | 1.30 | 88 min | 1.10 |
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Linn County REC | 2021 | 2.3 hrs | 1.59 | 2.3 hrs | 1.59 |
| Farmers Electric Coop - (IA) | 2018 | 77 min | 2.30 | 77 min | 2.30 |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
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 ÷ 77,769 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. Johnson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Johnson 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/johnson-county