County annual report · FIPS 46127
2017 Union County, SD Power Outage Report
In 2017, customers in Union County, SD went without power for an average of 1.4 hours, a total of 4,593 customer-hours (South Dakota average 0.8 hours). That ranks 7th worst of 26 South Dakota counties and 1886th of 2,786 nationally.
Compared with SD, the US and 2016
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Union County, 2017
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 20, 2017 03:30 | July 20, 2017 14:15 | 10h 45m | 594 | 614 |
| 2 | July 12, 2017 00:00 | July 12, 2017 02:45 | 2h 45m | 568 | 679 |
| 3 | April 13, 2017 22:30 | April 14, 2017 00:45 | 2h 15m | 508 | 535 |
| 4 | August 30, 2017 13:00 | August 30, 2017 16:15 | 3h 15m | 503 | 776 |
| 5 | May 16, 2017 11:45 | May 16, 2017 21:30 | 9h 45m | 380 | 1,111 |
| 6 | November 11, 2017 20:45 | November 11, 2017 23:00 | 2h 15m | 109 | 159 |
| 7 | June 14, 2017 02:30 | June 15, 2017 04:00 | 1d 1h | 45 | 176 |
| 8 | October 6, 2017 15:45 | October 6, 2017 17:15 | 1h 30m | 45 | 57 |
| 9 | July 27, 2017 16:45 | July 27, 2017 19:45 | 3h | 23 | 17 |
| 10 | September 21, 2017 19:00 | September 22, 2017 03:45 | 8h 45m | 22 | 142 |
Outage episodes by size in 2017: 6 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 2017, 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 | 2017 | 1.9 hrs | 1.00 | 1.6 hrs | 0.91 |
| 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 2017; 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, 2017, 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/2017/south-dakota/union-county