County annual report · FIPS 46087
2021 McCook County, SD Power Outage Report
In 2021, customers in McCook County, SD went without power for an average of 3.3 hours, a total of 10K customer-hours (South Dakota average 3.4 hours). That ranks 24th worst of 61 South Dakota counties and 1755th 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 McCook 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 13, 2021 16:30 | August 14, 2021 10:00 | 17h 30m | 403 | 310 |
| 2 | November 2, 2021 07:15 | November 2, 2021 08:15 | 1h | 369 | 369 |
| 3 | November 19, 2021 08:15 | November 19, 2021 09:45 | 1h 30m | 369 | 554 |
| 4 | July 9, 2021 09:45 | July 14, 2021 18:00 | 5d 8h | 226 | 1,870 |
| 5 | June 5, 2021 19:15 | July 6, 2021 20:45 | 31d 1h | 103 | 1,362 |
| 6 | October 13, 2021 08:15 | October 17, 2021 15:45 | 4d 7h | 96 | 241 |
| 7 | September 18, 2021 00:15 | September 18, 2021 01:00 | 45m | 95 | 71 |
| 8 | March 18, 2021 20:15 | March 18, 2021 20:45 | 30m | 94 | 47 |
| 9 | September 29, 2021 23:30 | September 30, 2021 01:00 | 1h 30m | 53 | 54 |
| 10 | March 15, 2021 06:30 | March 15, 2021 17:00 | 10h 30m | 47 | 224 |
Outage episodes by size in 2021: 5 reached 100+ customers, 0 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 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) | - | - | - | - | - |
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 ÷ 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, 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/mccook-county