County annual report · FIPS 19049
2021 Dallas County, IA Power Outage Report
In 2021, customers in Dallas County, IA went without power for an average of 1.0 hours, a total of 59K customer-hours (Iowa average 2.7 hours). That ranks 89th worst of 99 Iowa counties and 2664th of 2,974 nationally.
Compared with IA, the US and 2020
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Dallas County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 12, 2021 15:45 | January 12, 2021 20:15 | 4h 30m | 4,704 | 1,181 |
| 2 | December 5, 2021 14:30 | December 5, 2021 18:45 | 4h 15m | 4,609 | 10K |
| 3 | December 15, 2021 23:30 | December 18, 2021 18:45 | 2d 19h | 2,148 | 17K |
| 4 | October 14, 2021 14:15 | October 14, 2021 18:30 | 4h 15m | 2,105 | 2,108 |
| 5 | December 11, 2021 07:00 | December 11, 2021 19:15 | 12h 15m | 1,857 | 3,632 |
| 6 | September 30, 2021 07:30 | September 30, 2021 15:45 | 8h 15m | 1,644 | 5,451 |
| 7 | March 13, 2021 18:00 | March 13, 2021 18:15 | 15m | 1,108 | 277 |
| 8 | October 21, 2021 23:00 | October 22, 2021 00:45 | 1h 45m | 1,004 | 1,260 |
| 9 | August 31, 2021 04:30 | August 31, 2021 21:45 | 17h 15m | 926 | 3,350 |
| 10 | January 5, 2021 23:15 | January 6, 2021 01:15 | 2h | 905 | 770 |
Outage episodes by size in 2021: 29 reached 100+ customers, 8 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 Dallas County reported on EIA Form 861 for 2021, 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 | 2021 | 1.9 hrs | 1.04 | 75 min | 0.74 |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Midland Power Coop | - | - | - | - | - |
| Waverly Municipal Elec Utility | - | - | - | - | - |
| Guthrie County Rural E C A | - | - | - | - | - |
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 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 58,451 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. Dallas County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Dallas County, IA annual power outage report, 2021, 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/2021/iowa/dallas-county