County annual report · FIPS 46027
2021 Clay County, SD Power Outage Report
In 2021, customers in Clay County, SD went without power for an average of 0.1 hours, a total of 823 customer-hours (South Dakota average 3.4 hours). That ranks 60th worst of 61 South Dakota counties and 2921st 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 Clay 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 | September 15, 2021 14:15 | September 15, 2021 15:00 | 45m | 94 | 71 |
| 2 | June 23, 2021 05:45 | June 24, 2021 12:45 | 1d 7h | 18 | 539 |
| 3 | June 9, 2021 15:00 | June 9, 2021 17:00 | 2h | 10 | 20 |
| 4 | June 14, 2021 18:15 | June 14, 2021 19:45 | 1h 30m | 10 | 15 |
| 5 | August 6, 2021 04:00 | August 6, 2021 04:30 | 30m | 10 | 5 |
| 6 | September 23, 2021 15:00 | September 23, 2021 16:00 | 1h | 10 | 10 |
| 7 | December 7, 2021 17:00 | December 7, 2021 17:15 | 15m | 10 | 3 |
| 8 | March 15, 2021 05:30 | March 15, 2021 13:00 | 7h 30m | 8 | 16 |
| 9 | June 11, 2021 11:15 | June 11, 2021 19:30 | 8h 15m | 3 | 25 |
| 10 | July 14, 2021 10:15 | July 14, 2021 17:00 | 6h 45m | 2 | 13 |
Outage episodes by size in 2021: 0 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 Clay 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 |
|---|---|---|---|---|---|
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Southeastern Electric Coop Inc - (SD) | - | - | - | - | - |
| Clay-Union Electric Corp | - | - | - | - | - |
| City of Vermillion - (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 ÷ 8,444 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. Clay County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Clay 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/). https://massoutage.com/reports/2021/south-dakota/clay-county