County annual report · FIPS 19167
2021 Sioux County, IA Power Outage Report
In 2021, customers in Sioux County, IA went without power for an average of 0.7 hours, a total of 12K customer-hours (Iowa average 2.7 hours). That ranks 96th worst of 99 Iowa counties and 2767th 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 Sioux 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 | December 16, 2021 03:00 | December 16, 2021 08:15 | 5h 15m | 791 | 2,160 |
| 2 | August 2, 2021 18:15 | August 2, 2021 20:00 | 1h 45m | 396 | 588 |
| 3 | September 20, 2021 07:45 | September 20, 2021 11:30 | 3h 45m | 380 | 132 |
| 4 | April 10, 2021 11:00 | April 10, 2021 11:45 | 45m | 362 | 272 |
| 5 | May 1, 2021 19:30 | May 1, 2021 20:45 | 1h 15m | 322 | 403 |
| 6 | November 14, 2021 05:15 | November 14, 2021 07:00 | 1h 45m | 213 | 373 |
| 7 | January 14, 2021 22:45 | January 15, 2021 13:30 | 14h 45m | 175 | 325 |
| 8 | October 11, 2021 19:30 | October 11, 2021 20:15 | 45m | 173 | 130 |
| 9 | August 26, 2021 13:15 | August 26, 2021 14:45 | 1h 30m | 161 | 163 |
| 10 | December 2, 2021 18:30 | December 2, 2021 20:00 | 1h 30m | 155 | 233 |
Outage episodes by size in 2021: 12 reached 100+ customers, 0 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 Sioux 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 |
| Lyon Rural Electric Coop | 2018 | 34 min | 0.38 | 34 min | 0.38 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Interstate Power and Light Co | - | - | - | - | - |
| North West Rural Electric Coop | - | - | - | - | - |
| City of Alton | - | - | - | - | - |
| City of Hawarden - (IA) | - | - | - | - | - |
| City of Orange City - (IA) | - | - | - | - | - |
| City of Sioux Center | - | - | - | - | - |
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 ÷ 16,993 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. Sioux County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sioux 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/sioux-county