County annual report · FIPS 46135
2019 Yankton County, SD Power Outage Report
In 2019, customers in Yankton County, SD went without power for an average of 0.1 hours, a total of 924 customer-hours (South Dakota average 3.8 hours). That ranks 47th worst of 58 South Dakota counties and 2832nd of 2,945 nationally.
Compared with SD, the US
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Yankton County, 2019
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 17, 2019 11:30 | July 17, 2019 11:45 | 15m | 68 | 17 |
| 2 | December 1, 2019 04:15 | December 2, 2019 15:00 | 1d 10h | 30 | 180 |
| 3 | July 13, 2019 11:30 | July 15, 2019 14:30 | 2d 3h | 21 | 271 |
| 4 | August 28, 2019 15:45 | August 28, 2019 16:15 | 30m | 20 | 10 |
| 5 | July 4, 2019 10:15 | July 5, 2019 15:15 | 1d 5h | 12 | 254 |
| 6 | December 5, 2019 16:15 | December 5, 2019 17:00 | 45m | 7 | 5 |
| 7 | July 17, 2019 12:30 | July 17, 2019 15:45 | 3h 15m | 6 | 16 |
| 8 | September 11, 2019 04:15 | September 11, 2019 04:30 | 15m | 6 | 2 |
| 9 | September 22, 2019 00:30 | September 22, 2019 02:15 | 1h 45m | 6 | 9 |
| 10 | October 16, 2019 14:45 | October 16, 2019 15:15 | 30m | 6 | 3 |
Outage episodes by size in 2019: 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 Yankton County reported on EIA Form 861 for 2019, 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) | 2018 | 1.9 hrs | 1.24 | 1.6 hrs | 1.13 |
| 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 87% of South Dakota's customers in 2019; 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, 2019, 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/2019/south-dakota/yankton-county