County annual report · FIPS 46061
2021 Hanson County, SD Power Outage Report
In 2021, customers in Hanson County, SD went without power for an average of 1.4 hours, a total of 2,825 customer-hours (South Dakota average 3.4 hours). That ranks 45th worst of 61 South Dakota counties and 2490th 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 Hanson 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 | October 20, 2021 09:30 | October 20, 2021 10:00 | 30m | 329 | 83 |
| 2 | August 23, 2021 18:00 | August 23, 2021 21:15 | 3h 15m | 250 | 746 |
| 3 | March 15, 2021 07:15 | March 16, 2021 00:15 | 17h | 202 | 1,047 |
| 4 | December 16, 2021 03:00 | December 16, 2021 06:15 | 3h 15m | 83 | 230 |
| 5 | May 8, 2021 08:30 | May 8, 2021 14:00 | 5h 30m | 26 | 142 |
| 6 | June 15, 2021 20:15 | June 15, 2021 22:45 | 2h 30m | 26 | 41 |
| 7 | January 14, 2021 23:45 | January 15, 2021 14:30 | 14h 45m | 24 | 82 |
| 8 | May 21, 2021 22:00 | May 22, 2021 01:00 | 3h | 22 | 66 |
| 9 | May 6, 2021 15:45 | May 6, 2021 16:45 | 1h | 20 | 20 |
| 10 | June 25, 2021 22:15 | June 26, 2021 00:30 | 2h 15m | 20 | 45 |
Outage episodes by size in 2021: 3 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 Hanson 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 | - | - | - | - | - |
| Southeastern Electric Coop Inc - (SD) | - | - | - | - | - |
| 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 ÷ 1,960 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. Hanson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Hanson 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/hanson-county