County annual report · FIPS 19123
2018 Mahaska County, IA Power Outage Report
In 2018, customers in Mahaska County, IA went without power for an average of 3.1 hours, a total of 25K customer-hours (Iowa average 2.2 hours). That ranks 27th worst of 99 Iowa counties and 1480th of 2,798 nationally.
Compared with IA, the US and 2017
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Mahaska County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 1, 2018 17:15 | September 3, 2018 02:15 | 1d 9h | 2,531 | 5,526 |
| 2 | September 15, 2018 19:00 | September 15, 2018 22:30 | 3h 30m | 1,651 | 2,403 |
| 3 | July 19, 2018 21:30 | July 20, 2018 19:45 | 22h 15m | 1,461 | 7,098 |
| 4 | August 28, 2018 22:15 | August 29, 2018 00:30 | 2h 15m | 1,304 | 2,279 |
| 5 | August 20, 2018 08:00 | August 20, 2018 09:30 | 1h 30m | 1,286 | 1,929 |
| 6 | January 11, 2018 21:15 | January 11, 2018 23:00 | 1h 45m | 320 | 195 |
| 7 | July 31, 2018 12:30 | July 31, 2018 14:00 | 1h 30m | 264 | 396 |
| 8 | December 8, 2018 14:45 | December 8, 2018 16:45 | 2h | 240 | 284 |
| 9 | September 3, 2018 17:45 | September 3, 2018 20:15 | 2h 30m | 227 | 59 |
| 10 | May 27, 2018 15:00 | May 27, 2018 18:30 | 3h 30m | 187 | 512 |
Outage episodes by size in 2018: 11 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 Mahaska County reported on EIA Form 861 for 2018, 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 | 2018 | 1.9 hrs | 1.18 | 75 min | 0.96 |
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Interstate Power and Light Co | - | - | - | - | - |
| Pella Cooperative Elec Assn | - | - | - | - | - |
| City of Pella - (IA) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 89% of Iowa's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 8,162 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. Mahaska County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Mahaska County, IA annual power outage report, 2018, 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/2018/iowa/mahaska-county