County annual report · FIPS 19103
2023 Johnson County, IA Power Outage Report
In 2023, customers in Johnson County, IA went without power for an average of 2.6 hours, a total of 204K customer-hours (Iowa average 2.0 hours). That ranks 33rd worst of 99 Iowa counties and 2079th of 2,977 nationally.
Compared with IA, the US and 2022
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Johnson County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 31, 2023 22:00 | April 2, 2023 12:45 | 1d 14h | 12,293 | 39K |
| 2 | May 6, 2023 05:45 | May 9, 2023 16:45 | 3d 11h | 6,587 | 35K |
| 3 | November 2, 2023 13:15 | November 2, 2023 21:00 | 7h 45m | 6,302 | 4,691 |
| 4 | August 12, 2023 23:30 | August 13, 2023 01:15 | 1h 45m | 5,210 | 1,304 |
| 5 | July 27, 2023 13:15 | July 27, 2023 20:30 | 7h 15m | 3,625 | 1,949 |
| 6 | July 14, 2023 00:00 | July 14, 2023 19:15 | 19h 15m | 3,326 | 2,773 |
| 7 | November 30, 2023 01:45 | November 30, 2023 04:00 | 2h 15m | 3,089 | 3,474 |
| 8 | June 17, 2023 11:00 | June 17, 2023 23:45 | 12h 45m | 2,894 | 6,141 |
| 9 | January 22, 2023 13:45 | January 22, 2023 16:00 | 2h 15m | 2,334 | 2,336 |
| 10 | June 18, 2023 05:15 | June 19, 2023 21:00 | 1d 15h | 2,211 | 13K |
Outage episodes by size in 2023: 96 reached 100+ customers, 20 reached 1,000+ customers, 1 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 2023, 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 | 2023 | 2.8 hrs | 1.13 | 78 min | 0.83 |
| Eastern Iowa Light & Power Coop | 2023 | 3.1 hrs | 1.23 | 1.7 hrs | 0.98 |
| East-Central Iowa Rural Elec Coop | 2023 | 52 min | 0.65 | 52 min | 0.65 |
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Linn County REC | 2023 | 2.1 hrs | 1.82 | 2.1 hrs | 1.82 |
| 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 2023; 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, 2023, 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/2023/iowa/johnson-county