County annual report · FIPS 46057
2020 Hamlin County, SD Power Outage Report
In 2020, customers in Hamlin County, SD went without power for an average of 22.7 hours, a total of 50K customer-hours (South Dakota average 4.6 hours). That ranks 4th worst of 62 South Dakota counties and 379th of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Hamlin County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 28, 2020 07:00 | August 28, 2020 15:45 | 8h 45m | 1,049 | 4,866 |
| 2 | January 2, 2020 15:15 | January 2, 2020 22:30 | 7h 15m | 556 | 3,541 |
| 3 | January 31, 2020 15:00 | January 31, 2020 22:00 | 7h | 556 | 277 |
| 4 | August 9, 2020 07:30 | August 9, 2020 10:15 | 2h 45m | 444 | 1,105 |
| 5 | November 18, 2020 13:30 | November 18, 2020 16:00 | 2h 30m | 443 | 1,108 |
| 6 | September 30, 2020 22:30 | September 30, 2020 23:00 | 30m | 440 | 220 |
| 7 | January 18, 2020 20:45 | January 20, 2020 20:15 | 1d 23h | 432 | 20K |
| 8 | December 2, 2020 16:15 | December 2, 2020 22:15 | 6h | 336 | 2,016 |
| 9 | April 27, 2020 16:00 | April 27, 2020 17:00 | 1h | 334 | 334 |
| 10 | April 27, 2020 19:30 | April 27, 2020 22:00 | 2h 30m | 334 | 651 |
Outage episodes by size in 2020: 27 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 Hamlin County reported on EIA Form 861 for 2020, 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 | 2020 | 1.6 hrs | 1.40 | 1.6 hrs | 1.40 |
| NorthWestern Energy - (SD) | 2020 | 2.6 hrs | 1.54 | 1.9 hrs | 1.28 |
| Sioux Valley SW Elec Coop | 2020 | 1.5 hrs | 2.73 | 83 min | 2.32 |
| H-D Electric Coop Inc | 2018 | 2.6 hrs | 1.52 | 1.6 hrs | 1.14 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Codington-Clark Elec Coop, Inc | - | - | - | - | - |
| Kingsbury Electric Coop, Inc | - | - | - | - | - |
| City of Bryant - (SD) | - | - | - | - | - |
| City of Estelline - (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 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,187 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. Hamlin County has data for 2018–2025.
Cite this report
MassOutage (massoutage.com), Hamlin County, SD annual power outage report, 2020, 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/2020/south-dakota/hamlin-county