County annual report · FIPS 46099
2025 Minnehaha County, SD Power Outage Report
In 2025, customers in Minnehaha County, SD went without power for an average of 8.8 hours, a total of 808K customer-hours (South Dakota average 6.5 hours). That ranks 11th worst of 65 South Dakota counties and 918th of 3,000 nationally.
Compared with SD, the US and 2024
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Minnehaha County, 2025
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 16, 2025 04:15 | October 16, 2025 17:15 | 13h | 7,222 | 2,863 |
| 2 | November 7, 2025 23:15 | November 10, 2025 18:00 | 2d 18h | 6,588 | 21K |
| 3 | January 1, 2025 00:00 | January 31, 2025 07:45 | 30d 7h | 4,646 | 412K |
| 4 | August 6, 2025 08:30 | August 6, 2025 21:30 | 13h | 4,127 | 11K |
| 5 | July 23, 2025 13:15 | July 31, 2025 17:30 | 8d 4h | 3,821 | 79K |
| 6 | May 15, 2025 09:15 | May 15, 2025 23:15 | 14h | 3,722 | 7,179 |
| 7 | April 18, 2025 13:15 | April 18, 2025 17:00 | 3h 45m | 3,335 | 6,092 |
| 8 | December 9, 2025 21:30 | December 10, 2025 20:45 | 23h 15m | 3,029 | 7,157 |
| 9 | July 1, 2025 11:30 | July 2, 2025 23:15 | 1d 11h | 2,435 | 7,568 |
| 10 | May 19, 2025 11:00 | May 20, 2025 07:45 | 20h 45m | 2,264 | 5,294 |
Outage episodes by size in 2025: 59 reached 100+ customers, 20 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 2025, 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 | 2024 | 2.6 hrs | 0.99 | 76 min | 0.80 |
| Sioux Valley SW Elec Coop | 2024 | 46 min | 0.92 | 46 min | 0.92 |
| 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 n/a of South Dakota's customers in 2025; 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, 2025, 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/2025/south-dakota/minnehaha-county