County annual report · FIPS 19103
2017 Johnson County, IA Power Outage Report
In 2017, customers in Johnson County, IA went without power for an average of 1.9 hours, a total of 151K customer-hours (Iowa average 2.0 hours). That ranks 41st worst of 99 Iowa counties and 1652nd of 2,786 nationally.
Compared with IA, the US and 2016
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Johnson County, 2017
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 10, 2017 20:45 | March 10, 2017 23:00 | 2h 15m | 42,670 | 44K |
| 2 | July 9, 2017 20:15 | July 9, 2017 23:30 | 3h 15m | 18,167 | 8,207 |
| 3 | November 22, 2017 18:15 | November 22, 2017 20:00 | 1h 45m | 8,569 | 2,151 |
| 4 | July 11, 2017 19:30 | July 12, 2017 08:15 | 12h 45m | 5,678 | 8,429 |
| 5 | May 17, 2017 20:00 | May 18, 2017 10:30 | 14h 30m | 5,324 | 4,798 |
| 6 | March 7, 2017 03:30 | March 7, 2017 18:30 | 15h | 3,433 | 7,451 |
| 7 | August 13, 2017 04:45 | August 13, 2017 09:30 | 4h 45m | 3,112 | 2,831 |
| 8 | August 30, 2017 00:45 | August 30, 2017 05:15 | 4h 30m | 2,559 | 7,586 |
| 9 | March 31, 2017 16:45 | March 31, 2017 18:45 | 2h | 2,305 | 2,138 |
| 10 | August 7, 2017 16:30 | August 7, 2017 19:45 | 3h 15m | 2,305 | 2,091 |
Outage episodes by size in 2017: 88 reached 100+ customers, 19 reached 1,000+ customers, 2 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 2017, 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 | 2017 | 1.9 hrs | 1.00 | 1.6 hrs | 0.91 |
| Eastern Iowa Light & Power Coop | 2017 | 1.9 hrs | 1.06 | 88 min | 0.92 |
| T I P Rural Electric Coop | 2017 | 2.8 hrs | 2.31 | 2.8 hrs | 2.31 |
| Linn County REC | 2017 | 1.6 hrs | 1.47 | 1.6 hrs | 1.46 |
| Farmers Electric Coop - (IA) | 2017 | 10 min | 0.41 | 10 min | 0.41 |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| East-Central Iowa Rural Elec Coop | - | - | - | - | - |
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 2017; 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, 2017, 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/2017/iowa/johnson-county