County annual report · FIPS 46087
2025 McCook County, SD Power Outage Report
In 2025, customers in McCook County, SD went without power for an average of 5.7 hours, a total of 18K customer-hours (South Dakota average 6.5 hours). That ranks 22nd worst of 65 South Dakota counties and 1326th 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 McCook 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 | June 12, 2025 01:15 | June 12, 2025 07:00 | 5h 45m | 1,715 | 4,190 |
| 2 | July 29, 2025 01:00 | July 29, 2025 18:00 | 17h | 386 | 1,086 |
| 3 | November 25, 2025 17:15 | November 25, 2025 19:30 | 2h 15m | 376 | 414 |
| 4 | March 19, 2025 15:15 | March 20, 2025 20:30 | 1d 5h | 372 | 1,797 |
| 5 | April 3, 2025 20:15 | April 8, 2025 15:30 | 4d 19h | 371 | 1,813 |
| 6 | July 4, 2025 08:45 | July 4, 2025 11:45 | 3h | 341 | 1,020 |
| 7 | June 12, 2025 22:00 | June 12, 2025 22:15 | 15m | 176 | 44 |
| 8 | September 18, 2025 15:15 | September 18, 2025 16:00 | 45m | 126 | 64 |
| 9 | March 12, 2025 07:30 | March 12, 2025 08:30 | 1h | 101 | 101 |
| 10 | March 15, 2025 02:00 | March 19, 2025 12:30 | 4d 10h | 78 | 725 |
Outage episodes by size in 2025: 9 reached 100+ customers, 1 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 McCook 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) | - | - | - | - | - |
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 ÷ 3,102 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. McCook County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), McCook 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/mccook-county