County annual report · FIPS 46099
2018 Minnehaha County, SD Power Outage Report
In 2018, customers in Minnehaha County, SD went without power for an average of 1.6 hours, a total of 147K customer-hours (South Dakota average 1.1 hours). That ranks 4th worst of 30 South Dakota counties and 2041st of 2,798 nationally.
Compared with SD, the US and 2017
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Minnehaha County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 7, 2018 11:30 | May 8, 2018 01:00 | 13h 30m | 13,253 | 17K |
| 2 | April 12, 2018 22:30 | May 3, 2018 11:30 | 20d 13h | 8,878 | 14K |
| 3 | November 30, 2018 22:30 | December 2, 2018 06:45 | 1d 8h | 6,048 | 8,017 |
| 4 | December 29, 2018 05:45 | December 29, 2018 09:15 | 3h 30m | 4,384 | 11K |
| 5 | January 2, 2018 18:00 | January 2, 2018 21:15 | 3h 15m | 3,994 | 3,996 |
| 6 | October 7, 2018 09:15 | October 7, 2018 11:00 | 1h 45m | 3,544 | 1,084 |
| 7 | May 6, 2018 21:30 | May 7, 2018 10:45 | 13h 15m | 1,901 | 1,023 |
| 8 | October 3, 2018 21:30 | October 4, 2018 09:30 | 12h | 1,816 | 4,344 |
| 9 | May 24, 2018 11:45 | May 24, 2018 19:30 | 7h 45m | 1,699 | 3,574 |
| 10 | July 26, 2018 17:15 | August 18, 2018 11:00 | 22d 17h | 1,181 | 22K |
Outage episodes by size in 2018: 58 reached 100+ customers, 11 reached 1,000+ customers, 1 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 2018, 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 | 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 |
| 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 46% of South Dakota's customers in 2018; 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, 2018, 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/2018/south-dakota/minnehaha-county