County annual report · FIPS 46079
2020 Lake County, SD Power Outage Report
In 2020, customers in Lake County, SD went without power for an average of 5.6 hours, a total of 45K customer-hours (South Dakota average 4.6 hours). That ranks 17th worst of 62 South Dakota counties and 1299th 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 Lake 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 | October 13, 2020 01:00 | November 19, 2020 14:15 | 37d 13h | 451 | 2,453 |
| 2 | March 25, 2020 16:15 | July 22, 2020 15:45 | 118d 23h | 269 | 39K |
| 3 | March 11, 2020 15:00 | March 11, 2020 20:45 | 5h 45m | 191 | 92 |
| 4 | August 10, 2020 10:15 | August 10, 2020 12:00 | 1h 45m | 188 | 329 |
| 5 | July 28, 2020 12:45 | July 29, 2020 15:00 | 1d 2h | 142 | 490 |
| 6 | August 5, 2020 20:30 | August 5, 2020 23:45 | 3h 15m | 141 | 189 |
| 7 | December 23, 2020 14:00 | December 23, 2020 14:15 | 15m | 127 | 32 |
| 8 | January 6, 2020 16:00 | January 6, 2020 21:15 | 5h 15m | 105 | 213 |
| 9 | August 23, 2020 20:45 | August 23, 2020 22:45 | 2h | 93 | 136 |
| 10 | December 1, 2020 18:45 | December 1, 2020 22:45 | 4h | 58 | 92 |
Outage episodes by size in 2020: 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 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 |
| Northern States Power Co - Minnesota | 2020 | 1.7 hrs | 0.84 | 68 min | 0.71 |
| Sioux Valley SW Elec Coop | 2020 | 1.5 hrs | 2.73 | 83 min | 2.32 |
| 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 2020; 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, 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/lake-county