County annual report · FIPS 46003
2025 Aurora County, SD Power Outage Report
In 2025, customers in Aurora County, SD went without power for an average of 1.8 hours, a total of 2,521 customer-hours (South Dakota average 6.5 hours). That ranks 45th worst of 65 South Dakota counties and 2480th of 3,000 nationally.
Compared with SD, the US and 2024
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Aurora County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 30, 2025 08:00 | November 30, 2025 14:45 | 6h 45m | 701 | 1,396 |
| 2 | January 15, 2025 19:15 | January 15, 2025 19:30 | 15m | 472 | 118 |
| 3 | July 23, 2025 12:15 | July 23, 2025 14:15 | 2h | 79 | 97 |
| 4 | November 7, 2025 18:30 | November 7, 2025 18:45 | 15m | 69 | 17 |
| 5 | October 2, 2025 17:45 | October 2, 2025 21:15 | 3h 30m | 64 | 178 |
| 6 | November 13, 2025 15:00 | November 13, 2025 18:15 | 3h 15m | 42 | 119 |
| 7 | July 29, 2025 23:30 | July 30, 2025 02:30 | 3h | 20 | 51 |
| 8 | August 28, 2025 12:00 | August 28, 2025 13:45 | 1h 45m | 20 | 35 |
| 9 | November 10, 2025 18:00 | November 10, 2025 18:30 | 30m | 20 | 5 |
| 10 | December 14, 2025 10:00 | December 14, 2025 12:30 | 2h 30m | 20 | 22 |
Outage episodes by size in 2025: 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 Aurora County reported on EIA Form 861 for 2025, 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 |
|---|---|---|---|---|---|
| NorthWestern Energy - (SD) | 2024 | 76 min | 0.70 | 66 min | 0.65 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Central Electric Coop, Inc - (SD) | - | - | - | - | - |
| Douglas Electric Coop, Inc | - | - | - | - | - |
| City of Plankinton - (SD) | - | - | - | - | - |
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 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,368 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. Aurora County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Aurora County, SD annual power outage report, 2025, 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/2025/south-dakota/aurora-county