County annual report · FIPS 19103
2015 Johnson County, IA Power Outage Report
In 2015, customers in Johnson County, IA went without power for an average of 0.7 hours, a total of 54K customer-hours (Iowa average 1.1 hours). That ranks 65th worst of 99 Iowa counties and 1961st of 2,484 nationally.
Compared with IA, the US
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Johnson County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 4, 2015 18:30 | June 5, 2015 23:15 | 1d 4h | 4,054 | 28K |
| 2 | June 8, 2015 20:15 | June 8, 2015 20:30 | 15m | 1,630 | 408 |
| 3 | August 25, 2015 17:00 | August 25, 2015 18:15 | 1h 15m | 1,272 | 1,590 |
| 4 | November 12, 2015 16:15 | November 13, 2015 00:30 | 8h 15m | 1,231 | 1,059 |
| 5 | February 5, 2015 11:15 | February 5, 2015 11:45 | 30m | 1,008 | 504 |
| 6 | March 24, 2015 05:15 | March 24, 2015 09:00 | 3h 45m | 848 | 1,145 |
| 7 | November 11, 2015 23:15 | November 12, 2015 13:30 | 14h 15m | 625 | 1,628 |
| 8 | October 20, 2015 22:15 | October 21, 2015 05:15 | 7h | 557 | 1,417 |
| 9 | October 8, 2015 14:00 | October 9, 2015 01:30 | 11h 30m | 472 | 2,716 |
| 10 | October 15, 2015 21:30 | October 15, 2015 22:15 | 45m | 471 | 248 |
Outage episodes by size in 2015: 32 reached 100+ customers, 5 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 2015, 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 | 2015 | 2.2 hrs | 1.05 | 87 min | 0.88 |
| Eastern Iowa Light & Power Coop | 2015 | 2.2 hrs | 1.50 | 1.7 hrs | 1.25 |
| T I P Rural Electric Coop | 2015 | 2.1 hrs | 1.93 | 2.1 hrs | 1.93 |
| Linn County REC | 2015 | 1.6 hrs | 1.13 | 1.6 hrs | 1.11 |
| Farmers Electric Coop - (IA) | 2015 | 11 min | 0.14 | 11 min | 0.14 |
| 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 2015; 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, 2015, 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/2015/iowa/johnson-county