County annual report · FIPS 38087
2021 Slope County, ND Power Outage Report
In 2021, customers in Slope County, ND went without power for an average of 0.2 hours, a total of 80 customer-hours (North Dakota average 1.0 hours). That ranks 43rd worst of 51 North Dakota counties and 2900th of 2,974 nationally.
Compared with ND, the US and 2019
Coverage line is EAGLE-I's share of North Dakota customers tracked each year.
Biggest outages in Slope County, 2021
The 1 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 28, 2021 20:15 | September 28, 2021 21:00 | 45m | 109 | 80 |
Outage episodes by size in 2021: 1 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 Slope 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 | - | - | - | - | - |
| Roughrider Electric Cooperativ | - | - | - | - | - |
| Goldenwest Electric Coop, Inc | - | - | - | - | - |
| Slope 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 ÷ 467 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. Slope County has data for 2019, 2021, 2023–2025.
Cite this report
MassOutage (massoutage.com), Slope 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/slope-county