County annual report · FIPS 46057
2025 Hamlin County, SD Power Outage Report
In 2025, customers in Hamlin County, SD went without power for an average of 2.9 hours, a total of 6,348 customer-hours (South Dakota average 6.5 hours). That ranks 28th worst of 65 South Dakota counties and 2094th of 3,000 nationally.
Compared with SD, the US and 2024
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Hamlin County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 28, 2025 03:15 | June 28, 2025 18:30 | 15h 15m | 930 | 2,399 |
| 2 | March 24, 2025 18:45 | March 24, 2025 19:00 | 15m | 517 | 129 |
| 3 | December 4, 2025 13:00 | December 4, 2025 14:15 | 1h 15m | 511 | 130 |
| 4 | August 17, 2025 15:15 | August 17, 2025 15:45 | 30m | 506 | 127 |
| 5 | July 20, 2025 16:30 | July 21, 2025 13:45 | 21h 15m | 449 | 133 |
| 6 | August 11, 2025 15:45 | August 11, 2025 17:00 | 1h 15m | 448 | 275 |
| 7 | June 3, 2025 15:15 | June 3, 2025 21:45 | 6h 30m | 142 | 55 |
| 8 | August 21, 2025 21:00 | August 21, 2025 22:15 | 1h 15m | 130 | 139 |
| 9 | September 4, 2025 14:45 | September 4, 2025 16:00 | 1h 15m | 114 | 143 |
| 10 | April 1, 2025 15:00 | April 1, 2025 16:00 | 1h | 93 | 53 |
Outage episodes by size in 2025: 9 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 Hamlin County reported on EIA Form 861 for 2025, 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 | 2024 | 2.6 hrs | 1.37 | 1.9 hrs | 1.09 |
| NorthWestern Energy - (SD) | 2024 | 76 min | 0.70 | 66 min | 0.65 |
| Sioux Valley SW Elec Coop | 2024 | 46 min | 0.92 | 46 min | 0.92 |
| 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 n/a of South Dakota's customers in 2025; 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, 2025, 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/2025/south-dakota/hamlin-county