County annual report · FIPS 46127
2015 Union County, SD Power Outage Report
In 2015, customers in Union County, SD went without power for an average of 0.3 hours, a total of 1,143 customer-hours (South Dakota average 0.7 hours). That ranks 6th worst of 10 South Dakota counties and 2159th of 2,484 nationally.
Compared with SD, the US
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Union County, 2015
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 20, 2015 14:00 | August 20, 2015 18:45 | 4h 45m | 218 | 704 |
| 2 | November 11, 2015 17:00 | November 11, 2015 22:30 | 5h 30m | 70 | 25 |
| 3 | September 25, 2015 17:15 | September 25, 2015 22:15 | 5h | 62 | 170 |
| 4 | September 10, 2015 04:15 | September 10, 2015 13:15 | 9h | 25 | 108 |
| 5 | August 13, 2015 07:45 | August 13, 2015 09:45 | 2h | 10 | 10 |
| 6 | September 1, 2015 14:00 | September 1, 2015 14:30 | 30m | 10 | 3 |
| 7 | September 26, 2015 06:30 | September 26, 2015 16:45 | 10h 15m | 7 | 30 |
| 8 | December 20, 2015 22:00 | December 21, 2015 02:30 | 4h 30m | 5 | 6 |
| 9 | August 5, 2015 13:30 | August 5, 2015 14:30 | 1h | 4 | 3 |
| 10 | August 23, 2015 14:30 | August 24, 2015 00:00 | 9h 30m | 3 | 29 |
Outage episodes by size in 2015: 1 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 2015, 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 | 2015 | 2.2 hrs | 1.05 | 87 min | 0.88 |
| 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 2015; 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, 2015, 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/2015/south-dakota/union-county