County annual report · FIPS 46045
2021 Edmunds County, SD Power Outage Report
In 2021, customers in Edmunds County, SD went without power for an average of 5.5 hours, a total of 12K customer-hours (South Dakota average 3.4 hours). That ranks 11th worst of 61 South Dakota counties and 1239th of 2,974 nationally.
Compared with SD, the US and 2020
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Edmunds 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 | February 3, 2021 20:45 | February 4, 2021 14:15 | 17h 30m | 1,188 | 5,790 |
| 2 | October 14, 2021 05:45 | October 14, 2021 06:30 | 45m | 687 | 515 |
| 3 | January 15, 2021 17:15 | January 15, 2021 17:30 | 15m | 171 | 43 |
| 4 | June 29, 2021 14:15 | July 1, 2021 09:30 | 1d 19h | 171 | 4,017 |
| 5 | August 27, 2021 02:00 | August 27, 2021 08:15 | 6h 15m | 165 | 666 |
| 6 | March 2, 2021 22:15 | March 2, 2021 22:30 | 15m | 161 | 40 |
| 7 | July 29, 2021 01:00 | July 30, 2021 09:15 | 1d 8h | 160 | 632 |
| 8 | December 29, 2021 03:00 | December 29, 2021 03:15 | 15m | 140 | 35 |
| 9 | November 8, 2021 17:15 | November 8, 2021 17:45 | 30m | 139 | 70 |
| 10 | November 14, 2021 03:30 | November 14, 2021 04:15 | 45m | 77 | 58 |
Outage episodes by size in 2021: 9 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 Edmunds 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 |
|---|---|---|---|---|---|
| NorthWestern Energy - (SD) | 2021 | 1.5 hrs | 0.95 | 81 min | 0.83 |
| Northern Electric Coop, Inc | 2021 | 2.0 hrs | 1.20 | 1.9 hrs | 1.18 |
| FEM Electric Assn, Inc | 2018 | 3.8 hrs | 2.21 | 3.8 hrs | 2.21 |
| Montana-Dakota Utilities Co | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 79% of South Dakota's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,191 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. Edmunds County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Edmunds County, SD 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/south-dakota/edmunds-county