County annual report · FIPS 19103
2025 Johnson County, IA Power Outage Report
In 2025, customers in Johnson County, IA went without power for an average of 1.7 hours, a total of 136K customer-hours (Iowa average 2.9 hours). That ranks 84th worst of 99 Iowa counties and 2528th of 3,000 nationally.
Compared with IA, the US and 2024
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Johnson County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 1, 2025 16:00 | December 2, 2025 00:45 | 8h 45m | 8,629 | 15K |
| 2 | November 30, 2025 22:15 | December 1, 2025 15:15 | 17h | 8,208 | 12K |
| 3 | August 12, 2025 07:15 | August 12, 2025 13:15 | 6h | 3,588 | 7,263 |
| 4 | July 11, 2025 08:15 | July 11, 2025 15:30 | 7h 15m | 3,379 | 3,647 |
| 5 | August 15, 2025 23:00 | August 16, 2025 20:30 | 21h 30m | 2,884 | 11K |
| 6 | June 24, 2025 11:00 | June 24, 2025 14:00 | 3h | 2,512 | 3,659 |
| 7 | December 8, 2025 15:00 | December 8, 2025 19:45 | 4h 45m | 2,278 | 1,684 |
| 8 | September 20, 2025 19:00 | September 20, 2025 23:30 | 4h 30m | 2,066 | 4,295 |
| 9 | July 20, 2025 19:00 | July 21, 2025 00:15 | 5h 15m | 1,936 | 2,468 |
| 10 | April 14, 2025 02:30 | April 14, 2025 04:00 | 1h 30m | 1,535 | 1,405 |
Outage episodes by size in 2025: 91 reached 100+ customers, 17 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 2025, 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 2025; 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, 2025, 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/2025/iowa/johnson-county