County annual report · FIPS 46127
2023 Union County, SD Power Outage Report
In 2023, customers in Union County, SD went without power for an average of 2.3 hours, a total of 7,844 customer-hours (South Dakota average 2.3 hours). That ranks 29th worst of 61 South Dakota counties and 2176th 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 Union 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 | November 20, 2023 22:15 | November 20, 2023 23:30 | 1h 15m | 1,082 | 1,096 |
| 2 | December 9, 2023 23:30 | December 10, 2023 02:00 | 2h 30m | 1,082 | 1,553 |
| 3 | October 17, 2023 22:00 | October 18, 2023 00:15 | 2h 15m | 893 | 1,250 |
| 4 | August 19, 2023 15:15 | August 19, 2023 15:30 | 15m | 327 | 82 |
| 5 | May 2, 2023 19:45 | May 2, 2023 22:45 | 3h | 220 | 187 |
| 6 | May 18, 2023 15:15 | May 18, 2023 17:45 | 2h 30m | 61 | 151 |
| 7 | June 1, 2023 15:15 | June 1, 2023 15:45 | 30m | 60 | 30 |
| 8 | October 23, 2023 19:00 | October 23, 2023 23:00 | 4h | 42 | 55 |
| 9 | May 5, 2023 04:00 | May 5, 2023 10:15 | 6h 15m | 33 | 200 |
| 10 | April 16, 2023 22:15 | April 17, 2023 04:15 | 6h | 32 | 110 |
Outage episodes by size in 2023: 5 reached 100+ customers, 2 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 Union 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 |
|---|---|---|---|---|---|
| MidAmerican Energy Co | 2023 | 2.8 hrs | 1.13 | 78 min | 0.83 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Southeastern Electric Coop Inc - (SD) | - | - | - | - | - |
| Clay-Union Electric Corp | - | - | - | - | - |
| City of Beresford | - | - | - | - | - |
| City of Elk Point | - | - | - | - | - |
| Union County Electric Coop Inc | - | - | - | - | - |
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 ÷ 3,359 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. Union County has data for 2015–2017, 2019–2025.
Cite this report
MassOutage (massoutage.com), Union 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/union-county