County annual report · FIPS 46079
2021 Lake County, SD Power Outage Report
In 2021, customers in Lake County, SD went without power for an average of 2.1 hours, a total of 17K customer-hours (South Dakota average 3.4 hours). That ranks 37th worst of 61 South Dakota counties and 2165th 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 Lake 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 | June 28, 2021 11:15 | June 28, 2021 12:30 | 1h 15m | 632 | 790 |
| 2 | June 1, 2021 05:00 | June 1, 2021 07:00 | 2h | 627 | 940 |
| 3 | July 21, 2021 13:45 | July 22, 2021 13:00 | 23h 15m | 609 | 9,757 |
| 4 | July 28, 2021 12:30 | July 28, 2021 13:15 | 45m | 347 | 201 |
| 5 | July 24, 2021 07:15 | July 24, 2021 09:45 | 2h 30m | 213 | 533 |
| 6 | September 30, 2021 02:15 | September 30, 2021 06:45 | 4h 30m | 188 | 759 |
| 7 | May 8, 2021 17:00 | May 8, 2021 18:15 | 1h 15m | 186 | 233 |
| 8 | July 3, 2021 03:30 | July 3, 2021 05:15 | 1h 45m | 109 | 173 |
| 9 | April 19, 2021 14:00 | April 30, 2021 12:30 | 10d 22h | 108 | 728 |
| 10 | July 3, 2021 19:30 | July 3, 2021 20:45 | 1h 15m | 107 | 122 |
Outage episodes by size in 2021: 10 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 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 |
|---|---|---|---|---|---|
| Otter Tail Power Co | 2021 | 86 min | 1.13 | 74 min | 1.09 |
| Northern States Power Co - Minnesota | 2021 | 1.8 hrs | 0.82 | 77 min | 0.74 |
| Sioux Valley SW Elec Coop | 2021 | 1.8 hrs | 1.08 | 1.5 hrs | 0.93 |
| 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 79% of South Dakota's customers in 2021; 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, 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/lake-county