County annual report · FIPS 46099
2021 Minnehaha County, SD Power Outage Report
In 2021, customers in Minnehaha County, SD went without power for an average of 2.5 hours, a total of 233K customer-hours (South Dakota average 3.4 hours). That ranks 34th worst of 61 South Dakota counties and 2023rd 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 Minnehaha 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 | August 6, 2021 01:45 | August 31, 2021 19:45 | 25d 18h | 7,171 | 27K |
| 2 | February 16, 2021 13:45 | February 16, 2021 22:30 | 8h 45m | 7,033 | 16K |
| 3 | June 3, 2021 11:30 | June 16, 2021 23:15 | 13d 11h | 2,732 | 9,752 |
| 4 | September 16, 2021 13:15 | September 29, 2021 19:30 | 13d 6h | 2,622 | 47K |
| 5 | February 24, 2021 15:15 | February 25, 2021 01:00 | 9h 45m | 2,206 | 2,432 |
| 6 | July 25, 2021 12:00 | July 25, 2021 18:45 | 6h 45m | 2,102 | 3,223 |
| 7 | December 16, 2021 02:00 | December 16, 2021 20:45 | 18h 45m | 1,913 | 4,663 |
| 8 | November 5, 2021 10:45 | November 16, 2021 22:30 | 11d 11h | 1,864 | 6,935 |
| 9 | January 26, 2021 14:30 | January 26, 2021 21:30 | 7h | 1,772 | 1,829 |
| 10 | December 14, 2021 15:15 | December 14, 2021 18:00 | 2h 45m | 1,614 | 1,910 |
Outage episodes by size in 2021: 63 reached 100+ customers, 14 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 Minnehaha 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 |
|---|---|---|---|---|---|
| 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 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Southeastern Electric Coop Inc - (SD) | - | - | - | - | - |
| City of Sioux Falls - (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 ÷ 91,940 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. Minnehaha County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Minnehaha 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/minnehaha-county