County annual report · FIPS 46127
2019 Union County, SD Power Outage Report
In 2019, customers in Union County, SD went without power for an average of 0.2 hours, a total of 561 customer-hours (South Dakota average 3.8 hours). That ranks 45th worst of 58 South Dakota counties and 2788th of 2,945 nationally.
Compared with SD, the US and 2017
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Union 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 | August 6, 2019 22:30 | August 6, 2019 23:15 | 45m | 314 | 197 |
| 2 | August 19, 2019 09:15 | August 19, 2019 10:45 | 1h 30m | 136 | 139 |
| 3 | June 30, 2019 14:30 | June 30, 2019 16:00 | 1h 30m | 16 | 21 |
| 4 | September 14, 2019 12:30 | September 14, 2019 14:30 | 2h | 14 | 28 |
| 5 | September 11, 2019 06:15 | September 11, 2019 11:30 | 5h 15m | 10 | 32 |
| 6 | September 12, 2019 02:30 | September 12, 2019 02:45 | 15m | 6 | 2 |
| 7 | June 27, 2019 11:30 | June 27, 2019 15:45 | 4h 15m | 4 | 16 |
| 8 | December 20, 2019 09:15 | December 20, 2019 11:00 | 1h 45m | 4 | 6 |
| 9 | August 2, 2019 12:30 | August 2, 2019 13:15 | 45m | 2 | 2 |
| 10 | September 11, 2019 15:00 | September 11, 2019 15:15 | 15m | 2 | 1 |
Outage episodes by size in 2019: 2 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 Union 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 |
|---|---|---|---|---|---|
| MidAmerican Energy Co | 2018 | 1.9 hrs | 1.18 | 75 min | 0.96 |
| 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 87% of South Dakota's customers in 2019; 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, 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/union-county