County annual report · FIPS 38017
2021 Cass County, ND Power Outage Report
In 2021, customers in Cass County, ND went without power for an average of 0.9 hours, a total of 112K customer-hours (North Dakota average 1.0 hours). That ranks 23rd worst of 51 North Dakota counties and 2706th 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 Cass 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 | January 13, 2021 19:15 | January 13, 2021 19:30 | 15m | 14,760 | 3,690 |
| 2 | May 16, 2021 00:30 | May 16, 2021 03:00 | 2h 30m | 5,994 | 12K |
| 3 | June 8, 2021 03:00 | June 9, 2021 02:45 | 23h 45m | 4,205 | 14K |
| 4 | September 2, 2021 19:15 | September 3, 2021 01:00 | 5h 45m | 3,496 | 9,272 |
| 5 | July 4, 2021 09:15 | July 4, 2021 11:15 | 2h | 3,055 | 3,819 |
| 6 | April 21, 2021 18:15 | April 21, 2021 21:30 | 3h 15m | 2,980 | 772 |
| 7 | March 11, 2021 01:15 | March 11, 2021 17:15 | 16h | 1,779 | 9,932 |
| 8 | June 13, 2021 01:45 | June 13, 2021 02:45 | 1h | 1,587 | 1,190 |
| 9 | December 26, 2021 10:30 | December 26, 2021 15:45 | 5h 15m | 1,528 | 2,375 |
| 10 | June 16, 2021 16:30 | June 17, 2021 02:15 | 9h 45m | 1,521 | 3,397 |
Outage episodes by size in 2021: 73 reached 100+ customers, 16 reached 1,000+ customers, 1 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 Cass 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 |
|---|---|---|---|---|---|
| Otter Tail Power Co | 2021 | 86 min | 1.13 | 74 min | 1.09 |
| Northern States Power Co - Minnesota | 2021 | 1.8 hrs | 0.82 | 77 min | 0.74 |
| Nodak Electric Coop Inc | 2021 | 3.4 hrs | 1.38 | 3.4 hrs | 1.38 |
| Cass County Elec Coop Inc | 2021 | 47 min | 0.54 | 24 min | 0.39 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
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 ÷ 124,603 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. Cass County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Cass 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/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/north-dakota/cass-county