County annual report · FIPS 19103
2024 Johnson County, IA Power Outage Report
In 2024, customers in Johnson County, IA went without power for an average of 2.2 hours, a total of 170K customer-hours (Iowa average 3.2 hours). That ranks 67th worst of 99 Iowa counties and 2354th of 2,990 nationally.
Compared with IA, the US and 2023
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Johnson County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 29, 2024 11:30 | May 29, 2024 12:30 | 1h | 3,665 | 921 |
| 2 | July 15, 2024 23:30 | July 16, 2024 23:00 | 23h 30m | 2,897 | 11K |
| 3 | May 28, 2024 09:00 | May 28, 2024 11:00 | 2h | 2,762 | 2,902 |
| 4 | November 8, 2024 20:15 | November 9, 2024 00:15 | 4h | 2,690 | 1,420 |
| 5 | December 14, 2024 12:45 | December 15, 2024 23:15 | 1d 10h | 2,608 | 17K |
| 6 | September 11, 2024 13:45 | September 11, 2024 21:15 | 7h 30m | 2,470 | 5,463 |
| 7 | September 20, 2024 14:00 | September 20, 2024 19:00 | 5h | 2,383 | 629 |
| 8 | April 16, 2024 14:00 | April 17, 2024 14:00 | 1d | 1,969 | 11K |
| 9 | April 8, 2024 04:30 | April 8, 2024 08:45 | 4h 15m | 1,898 | 2,496 |
| 10 | September 8, 2024 12:00 | September 8, 2024 19:00 | 7h | 1,898 | 1,452 |
Outage episodes by size in 2024: 91 reached 100+ customers, 24 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 2024, 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 | 2024 | 5.5 hrs | 1.42 | 1.7 hrs | 0.94 |
| Eastern Iowa Light & Power Coop | 2024 | 3.7 hrs | 1.29 | 1.6 hrs | 0.90 |
| East-Central Iowa Rural Elec Coop | 2024 | 38 min | 0.53 | 38 min | 0.53 |
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Linn County REC | 2024 | 1.9 hrs | 1.50 | 1.9 hrs | 1.50 |
| 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 n/a of Iowa's customers in 2024; 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, 2024, 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/2024/iowa/johnson-county