County annual report · FIPS 46135
2020 Yankton County, SD Power Outage Report
In 2020, customers in Yankton County, SD went without power for an average of 29.5 hours, a total of 353K customer-hours (South Dakota average 4.6 hours). That ranks 2nd worst of 62 South Dakota counties and 283rd of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Yankton County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 6, 2020 22:00 | July 7, 2020 13:45 | 15h 45m | 1,406 | 3,809 |
| 2 | June 9, 2020 22:30 | June 10, 2020 11:30 | 13h | 1,117 | 1,747 |
| 3 | December 15, 2020 15:00 | December 15, 2020 16:15 | 1h 15m | 1,071 | 1,339 |
| 4 | December 15, 2020 19:15 | December 17, 2020 14:30 | 1d 19h | 1,071 | 42K |
| 5 | October 11, 2020 20:45 | November 7, 2020 14:30 | 26d 17h | 758 | 283K |
| 6 | July 3, 2020 16:30 | July 6, 2020 19:30 | 3d 3h | 418 | 703 |
| 7 | March 6, 2020 22:15 | March 7, 2020 00:00 | 1h 45m | 222 | 334 |
| 8 | April 27, 2020 13:15 | May 2, 2020 00:00 | 4d 10h | 203 | 10K |
| 9 | July 10, 2020 22:45 | July 15, 2020 23:30 | 5d | 91 | 1,848 |
| 10 | June 29, 2020 18:30 | June 30, 2020 01:45 | 7h 15m | 72 | 244 |
Outage episodes by size in 2020: 8 reached 100+ customers, 4 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 Yankton County reported on EIA Form 861 for 2020, 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 |
|---|---|---|---|---|---|
| NorthWestern Energy - (SD) | 2020 | 2.6 hrs | 1.54 | 1.9 hrs | 1.28 |
| Bon Homme Yankton El Assn, Inc | 2018 | 34 min | 0.32 | 34 min | 0.32 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Southeastern Electric Coop Inc - (SD) | - | - | - | - | - |
| Clay-Union Electric Corp | - | - | - | - | - |
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 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 11,940 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. Yankton County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Yankton County, SD annual power outage report, 2020, 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/2020/south-dakota/yankton-county