County annual report · FIPS 46127
2020 Union County, SD Power Outage Report
In 2020, customers in Union County, SD went without power for an average of 1.7 hours, a total of 5,600 customer-hours (South Dakota average 4.6 hours). That ranks 44th worst of 62 South Dakota counties and 2395th of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Union County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 17, 2020 01:15 | May 17, 2020 04:00 | 2h 45m | 226 | 617 |
| 2 | February 14, 2020 20:30 | February 15, 2020 03:30 | 7h | 147 | 82 |
| 3 | December 4, 2020 03:15 | December 4, 2020 14:45 | 11h 30m | 88 | 217 |
| 4 | February 7, 2020 23:30 | February 8, 2020 01:45 | 2h 15m | 84 | 48 |
| 5 | November 5, 2020 14:45 | November 5, 2020 15:15 | 30m | 66 | 22 |
| 6 | July 16, 2020 09:30 | July 16, 2020 10:30 | 1h | 59 | 40 |
| 7 | June 17, 2020 15:00 | June 17, 2020 16:45 | 1h 45m | 36 | 49 |
| 8 | October 19, 2020 05:45 | October 19, 2020 06:30 | 45m | 33 | 10 |
| 9 | July 27, 2020 13:15 | July 27, 2020 15:15 | 2h | 25 | 45 |
| 10 | August 12, 2020 22:00 | August 13, 2020 02:00 | 4h | 25 | 88 |
Outage episodes by size in 2020: 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 2020, 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 | 2020 | 18.3 hrs | 1.43 | 82 min | 0.79 |
| 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 79% of South Dakota's customers in 2020; 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, 2020, 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/2020/south-dakota/union-county