County annual report · FIPS 46079
2019 Lake County, SD Power Outage Report
In 2019, customers in Lake County, SD went without power for an average of 4.6 hours, a total of 37K customer-hours (South Dakota average 3.8 hours). That ranks 12th worst of 58 South Dakota counties and 1175th of 2,945 nationally.
Compared with SD, the US and 2018
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Lake County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 20, 2019 12:15 | July 21, 2019 18:00 | 1d 5h | 440 | 1,256 |
| 2 | September 5, 2019 17:30 | September 6, 2019 21:45 | 1d 4h | 317 | 558 |
| 3 | November 5, 2019 16:15 | November 5, 2019 19:00 | 2h 45m | 304 | 161 |
| 4 | July 23, 2019 19:30 | July 24, 2019 20:45 | 1d 1h | 301 | 449 |
| 5 | September 11, 2019 13:00 | September 23, 2019 19:00 | 12d 6h | 189 | 2,316 |
| 6 | March 9, 2019 13:45 | March 9, 2019 17:30 | 3h 45m | 185 | 641 |
| 7 | September 11, 2019 03:30 | September 11, 2019 06:15 | 2h 45m | 184 | 375 |
| 8 | April 27, 2019 12:00 | April 27, 2019 14:45 | 2h 45m | 183 | 396 |
| 9 | April 27, 2019 15:30 | April 27, 2019 19:30 | 4h | 183 | 277 |
| 10 | April 11, 2019 04:15 | April 14, 2019 20:00 | 3d 15h | 179 | 10K |
Outage episodes by size in 2019: 19 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 2019, 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 | 2018 | 1.8 hrs | 1.30 | 1.7 hrs | 1.23 |
| Northern States Power Co - Minnesota | 2018 | 90 min | 0.73 | 69 min | 0.62 |
| Sioux Valley SW Elec Coop | 2018 | 4.0 hrs | 3.62 | 2.0 hrs | 2.88 |
| 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 87% of South Dakota's customers in 2019; 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, 2019, 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/2019/south-dakota/lake-county