County annual report · FIPS 46099
2020 Minnehaha County, SD Power Outage Report
In 2020, customers in Minnehaha County, SD went without power for an average of 7.0 hours, a total of 641K customer-hours (South Dakota average 4.6 hours). That ranks 10th worst of 62 South Dakota counties and 1093rd 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 Minnehaha 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 22, 2020 08:30 | October 22, 2020 22:45 | 14h 15m | 7,575 | 6,846 |
| 2 | October 4, 2020 23:30 | October 5, 2020 03:15 | 3h 45m | 3,983 | 4,887 |
| 3 | February 19, 2020 13:45 | February 28, 2020 15:30 | 9d 1h | 3,443 | 25K |
| 4 | June 15, 2020 13:30 | July 14, 2020 02:00 | 28d 12h | 2,738 | 29K |
| 5 | July 23, 2020 13:00 | July 23, 2020 20:15 | 7h 15m | 2,621 | 2,990 |
| 6 | April 15, 2020 12:45 | May 18, 2020 20:30 | 33d 7h | 2,277 | 105K |
| 7 | January 1, 2020 00:00 | January 18, 2020 19:45 | 17d 19h | 2,164 | 201K |
| 8 | February 1, 2020 14:15 | February 17, 2020 21:45 | 16d 7h | 1,899 | 205K |
| 9 | October 27, 2020 04:15 | October 27, 2020 04:30 | 15m | 1,845 | 461 |
| 10 | January 19, 2020 04:30 | January 20, 2020 15:15 | 1d 10h | 1,512 | 669 |
Outage episodes by size in 2020: 58 reached 100+ customers, 13 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 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 |
|---|---|---|---|---|---|
| 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 |
| 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 2020; 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, 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/minnehaha-county