County annual report · FIPS 19167
2025 Sioux County, IA Power Outage Report
In 2025, customers in Sioux County, IA went without power for an average of 3.7 hours, a total of 63K customer-hours (Iowa average 2.9 hours). That ranks 41st worst of 99 Iowa counties and 1845th of 3,000 nationally.
Compared with IA, the US and 2024
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Sioux County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 29, 2025 02:30 | August 1, 2025 13:15 | 3d 10h | 4,060 | 47K |
| 2 | August 16, 2025 21:45 | August 18, 2025 12:15 | 1d 14h | 763 | 1,589 |
| 3 | June 29, 2025 08:45 | June 30, 2025 01:15 | 16h 30m | 758 | 2,208 |
| 4 | April 2, 2025 05:15 | April 2, 2025 07:30 | 2h 15m | 607 | 160 |
| 5 | September 15, 2025 03:00 | September 15, 2025 09:45 | 6h 45m | 591 | 978 |
| 6 | October 3, 2025 18:30 | October 3, 2025 19:30 | 1h | 578 | 434 |
| 7 | May 19, 2025 09:45 | May 19, 2025 20:15 | 10h 30m | 512 | 2,014 |
| 8 | June 15, 2025 14:00 | June 15, 2025 16:00 | 2h | 402 | 309 |
| 9 | December 14, 2025 05:30 | December 14, 2025 08:15 | 2h 45m | 255 | 492 |
| 10 | March 10, 2025 14:00 | March 10, 2025 15:30 | 1h 30m | 232 | 219 |
Outage episodes by size in 2025: 19 reached 100+ customers, 1 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 2025, 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 | 2024 | 5.5 hrs | 1.42 | 1.7 hrs | 0.94 |
| 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 n/a of Iowa's customers in 2025; 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, 2025, 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/2025/iowa/sioux-county