County annual report · FIPS 38085
2021 Sioux County, ND Power Outage Report
In 2021, customers in Sioux County, ND went without power for an average of 0.3 hours, a total of 712 customer-hours (North Dakota average 1.0 hours). That ranks 36th worst of 51 North Dakota counties and 2863rd of 2,974 nationally.
Compared with ND, the US and 2020
Coverage line is EAGLE-I's share of North Dakota customers tracked each year.
Biggest outages in Sioux County, 2021
The 5 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 14, 2021 05:45 | October 14, 2021 08:45 | 3h | 92 | 273 |
| 2 | January 13, 2021 21:30 | January 13, 2021 22:15 | 45m | 91 | 66 |
| 3 | August 14, 2021 09:00 | August 14, 2021 11:15 | 2h 15m | 89 | 197 |
| 4 | August 5, 2021 21:15 | August 5, 2021 23:15 | 2h | 83 | 166 |
| 5 | February 2, 2021 17:15 | February 2, 2021 18:30 | 1h 15m | 11 | 11 |
Outage episodes by size in 2021: 0 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 |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | - | - | - | - | - |
| Mor-Gran-Sou Electric Coop Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 66% of North Dakota's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,559 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 2019–2023, 2025.
Cite this report
MassOutage (massoutage.com), Sioux County, ND 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/). https://massoutage.com/reports/2021/north-dakota/sioux-county