County annual report · FIPS 46135
2023 Yankton County, SD Power Outage Report
In 2023, customers in Yankton County, SD went without power for an average of 3.1 hours, a total of 37K customer-hours (South Dakota average 2.3 hours). That ranks 21st worst of 61 South Dakota counties and 1928th of 2,977 nationally.
Compared with SD, the US and 2022
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Yankton County, 2023
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 18, 2023 14:30 | July 18, 2023 18:30 | 4h | 5,835 | 11K |
| 2 | May 8, 2023 02:15 | May 8, 2023 05:00 | 2h 45m | 3,237 | 6,789 |
| 3 | August 16, 2023 15:45 | August 16, 2023 17:30 | 1h 45m | 2,187 | 3,500 |
| 4 | July 26, 2023 14:15 | July 26, 2023 16:30 | 2h 15m | 877 | 1,754 |
| 5 | April 1, 2023 08:30 | April 1, 2023 10:00 | 1h 30m | 475 | 607 |
| 6 | September 26, 2023 23:45 | September 27, 2023 04:45 | 5h | 475 | 1,653 |
| 7 | November 6, 2023 23:00 | November 7, 2023 01:00 | 2h | 455 | 828 |
| 8 | July 9, 2023 13:15 | July 9, 2023 14:30 | 1h 15m | 421 | 526 |
| 9 | April 27, 2023 19:45 | April 28, 2023 02:00 | 6h 15m | 413 | 663 |
| 10 | June 16, 2023 23:45 | June 17, 2023 03:45 | 4h | 391 | 1,085 |
Outage episodes by size in 2023: 16 reached 100+ customers, 3 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 2023, 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) | 2023 | 1.9 hrs | 1.37 | 74 min | 1.03 |
| 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 n/a of South Dakota's customers in 2023; 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, 2023, 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/2023/south-dakota/yankton-county