County annual report · FIPS 46111
2021 Sanborn County, SD Power Outage Report
In 2021, customers in Sanborn County, SD went without power for an average of 4.1 hours, a total of 5,962 customer-hours (South Dakota average 3.4 hours). That ranks 17th worst of 61 South Dakota counties and 1521st 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 Sanborn 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 | September 10, 2021 19:00 | September 10, 2021 20:15 | 1h 15m | 545 | 681 |
| 2 | December 12, 2021 16:30 | December 12, 2021 21:00 | 4h 30m | 348 | 1,192 |
| 3 | December 13, 2021 19:45 | December 14, 2021 03:15 | 7h 30m | 204 | 1,175 |
| 4 | May 8, 2021 17:00 | May 8, 2021 18:15 | 1h 15m | 198 | 248 |
| 5 | January 11, 2021 13:30 | January 11, 2021 14:30 | 1h | 156 | 156 |
| 6 | March 15, 2021 07:30 | March 16, 2021 00:00 | 16h 30m | 122 | 910 |
| 7 | August 31, 2021 13:30 | September 1, 2021 00:30 | 11h | 95 | 227 |
| 8 | July 26, 2021 22:15 | July 27, 2021 02:30 | 4h 15m | 80 | 320 |
| 9 | April 6, 2021 18:00 | April 6, 2021 22:15 | 4h 15m | 79 | 129 |
| 10 | August 22, 2021 01:00 | August 22, 2021 04:00 | 3h | 47 | 29 |
Outage episodes by size in 2021: 6 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 Sanborn 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 |
|---|---|---|---|---|---|
| Northern States Power Co - Minnesota | 2021 | 1.8 hrs | 0.82 | 77 min | 0.74 |
| NorthWestern Energy - (SD) | 2021 | 1.5 hrs | 0.95 | 81 min | 0.83 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Dakota Energy Coop Inc | - | - | - | - | - |
| Central Electric Coop, Inc - (SD) | - | - | - | - | - |
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 ÷ 1,463 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. Sanborn County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sanborn 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/sanborn-county