massoutage

County annual report · FIPS 38085

2025 Sioux County, ND Power Outage Report

In 2025, customers in Sioux County, ND went without power for an average of 0.0 hours, a total of 115 customer-hours (North Dakota average 3.1 hours). That ranks 52nd worst of 52 North Dakota counties and 2957th of 3,000 nationally.

Summary data CSVJSON
Avg hrs / customer
0.0
2,559 customers
Customer-hours out
115
Peak customers out
29
Outages ≥1,000 out
0
0 of 10,000+ · 1 total
Longest outage
4h
began December 20, 2025
Rank in state
52nd/52
2957th of 3,000 US

Compared with ND, the US and 2023

Sioux County, ND average hours without power per customer compared with state and national averages, 2025Sioux County 0.0 hours, North Dakota average 3.1 hours, US average 5.9 hours, Sioux County, 2023 0.2 hoursSioux CountySioux County0.0hNorth Dakota averageNorth Dakota average3.1hUS averageUS average5.9hSioux County, 2023Sioux County, 20230.2h
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Average hours without power per customer in 2025; last bar is this county in 2023.

Month by month

CSVJSON
Sioux County, ND customer-hours without power by month, 2025Jan 0, Feb 0, Mar 0, Apr 0, May 0, Jun 0, Jul 0, Aug 0, Sep 0, Oct 0, Nov 0, Dec 1150501001500Jan0Feb0Mar0Apr0May0Jun0Jul0Aug0Sep0Oct0Nov115Dec
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Customer-hours; December was the worst month.

Sioux County year over year

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Sioux County, ND: average hours without power per customer by year2015: no data; 2016: no data; 2017: no data; 2018: no data; 2019: 0.0h, coverage 53%; 2020: 0.3h, coverage 66%; 2021: 0.3h, coverage 66%; 2022: 0.1h, coverage 66%; 2023: 0.2h; 2024: no data; 2025: 0.0h00.10.20.30.40%50%100%n/a2015n/a2016n/a2017n/a20180.0h20190.3h20200.3h20210.1h20220.2h2023n/a20240.0h2025
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Average hours without power per customer. Line: EAGLE-I coverage, share of customers tracked (right axis).

Coverage line is EAGLE-I's share of North Dakota customers tracked each year.

Biggest outages in Sioux County, 2025

The 1 outage episodes with the most customers out at once. Times are UTC.

CSVJSON
#Started (UTC)Ended (UTC)DurationPeak outCustomer-hours
1December 20, 2025 10:15December 20, 2025 14:154h29115

Outage episodes by size in 2025: 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 2025, or their most recent earlier filing. Utility-wide figures, not county-specific.

CSVJSON
UtilityEIA yearSAIDISAIFISAIDI excl. major eventsSAIFI excl. major events
Montana-Dakota Utilities Co20242.9 hrs1.262.1 hrs1.10
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 n/a of North Dakota's customers in 2025; 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, 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/north-dakota/sioux-county

summary CSVJSONyears CSVJSONmonths CSVJSONevents CSVJSONutilities CSVJSON
Sioux County by year:20232022202120202019
Live outages in Sioux County2025 North Dakota report2025 US report