County annual report · FIPS 19103
2020 Johnson County, IA Power Outage Report
In 2020, customers in Johnson County, IA went without power for an average of 31.3 hours, a total of 2.4M customer-hours (Iowa average 27.4 hours). That ranks 13th worst of 99 Iowa counties and 263rd of 3,019 nationally.
Compared with IA, the US and 2019
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Johnson County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 10, 2020 13:30 | August 23, 2020 11:00 | 12d 21h | 51,777 | 2.3M |
| 2 | September 8, 2020 03:30 | September 9, 2020 02:00 | 22h 30m | 4,167 | 5,218 |
| 3 | August 30, 2020 22:00 | September 1, 2020 10:15 | 1d 12h | 4,113 | 7,240 |
| 4 | July 6, 2020 21:45 | July 7, 2020 13:00 | 15h 15m | 3,426 | 6,023 |
| 5 | May 15, 2020 01:00 | May 15, 2020 07:30 | 6h 30m | 3,415 | 4,856 |
| 6 | June 3, 2020 19:15 | June 4, 2020 00:30 | 5h 15m | 3,243 | 4,216 |
| 7 | January 10, 2020 21:15 | January 13, 2020 13:15 | 2d 16h | 2,195 | 18K |
| 8 | December 23, 2020 21:30 | December 24, 2020 02:30 | 5h | 2,173 | 3,632 |
| 9 | September 3, 2020 16:45 | September 4, 2020 01:45 | 9h | 1,826 | 1,852 |
| 10 | June 6, 2020 23:30 | June 7, 2020 04:30 | 5h | 1,701 | 2,041 |
Outage episodes by size in 2020: 101 reached 100+ customers, 18 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 2020, 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 | 2020 | 18.3 hrs | 1.43 | 82 min | 0.79 |
| Eastern Iowa Light & Power Coop | 2020 | 10.6 hrs | 2.12 | 1.9 hrs | 1.18 |
| East-Central Iowa Rural Elec Coop | 2020 | 14.1 hrs | 1.01 | 54 min | 0.59 |
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Linn County REC | 2020 | 58.0 hrs | 3.02 | 2.6 hrs | 1.74 |
| 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 2020; 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, 2020, 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/2020/iowa/johnson-county