County annual report · FIPS 46127
2024 Union County, SD Power Outage Report
In 2024, customers in Union County, SD went without power for an average of 5.5 hours, a total of 18K customer-hours (South Dakota average 2.3 hours). That ranks 10th worst of 65 South Dakota counties and 1509th of 2,990 nationally.
Compared with SD, the US and 2023
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Union County, 2024
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 13, 2024 19:00 | July 13, 2024 20:15 | 1h 15m | 1,806 | 1,943 |
| 2 | July 29, 2024 21:45 | July 31, 2024 09:45 | 1d 12h | 755 | 4,239 |
| 3 | February 27, 2024 18:30 | February 27, 2024 18:45 | 15m | 500 | 125 |
| 4 | April 15, 2024 18:30 | April 15, 2024 20:45 | 2h 15m | 499 | 1,117 |
| 5 | December 19, 2024 15:30 | December 19, 2024 16:30 | 1h | 475 | 438 |
| 6 | June 22, 2024 17:30 | June 28, 2024 16:45 | 5d 23h | 353 | 6,459 |
| 7 | January 29, 2024 20:30 | January 29, 2024 22:00 | 1h 30m | 269 | 403 |
| 8 | May 15, 2024 21:15 | May 16, 2024 02:30 | 5h 15m | 268 | 558 |
| 9 | May 21, 2024 11:30 | May 21, 2024 15:45 | 4h 15m | 155 | 312 |
| 10 | December 4, 2024 20:15 | December 4, 2024 22:45 | 2h 30m | 153 | 79 |
Outage episodes by size in 2024: 12 reached 100+ customers, 1 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 2024, 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 | 2024 | 5.5 hrs | 1.42 | 1.7 hrs | 0.94 |
| 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 2024; 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, 2024, 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/2024/south-dakota/union-county