County annual report · FIPS 46079
2025 Lake County, SD Power Outage Report
In 2025, customers in Lake County, SD went without power for an average of 1.0 hours, a total of 8,154 customer-hours (South Dakota average 6.5 hours). That ranks 56th worst of 65 South Dakota counties and 2754th 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 Lake 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 | August 17, 2025 15:00 | August 17, 2025 16:30 | 1h 30m | 893 | 309 |
| 2 | September 5, 2025 15:15 | September 5, 2025 17:30 | 2h 15m | 303 | 357 |
| 3 | April 30, 2025 14:15 | May 1, 2025 01:15 | 11h | 214 | 195 |
| 4 | January 10, 2025 19:00 | January 10, 2025 19:15 | 15m | 190 | 48 |
| 5 | June 12, 2025 01:15 | June 12, 2025 07:00 | 5h 45m | 190 | 1,046 |
| 6 | August 29, 2025 06:15 | August 29, 2025 09:45 | 3h 30m | 190 | 665 |
| 7 | April 28, 2025 16:15 | April 28, 2025 17:00 | 45m | 106 | 67 |
| 8 | November 21, 2025 14:00 | November 21, 2025 14:45 | 45m | 105 | 79 |
| 9 | September 12, 2025 13:15 | September 12, 2025 14:15 | 1h | 73 | 64 |
| 10 | October 12, 2025 11:45 | October 12, 2025 13:45 | 2h | 63 | 124 |
Outage episodes by size in 2025: 8 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 Lake 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 |
| Northern States Power Co - Minnesota | 2024 | 2.6 hrs | 0.99 | 76 min | 0.80 |
| Sioux Valley SW Elec Coop | 2024 | 46 min | 0.92 | 46 min | 0.92 |
| Southeastern Electric Coop Inc - (SD) | - | - | - | - | - |
| City of Madison - (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 ÷ 8,064 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. Lake County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Lake 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/lake-county