County annual report · FIPS 46003
2021 Aurora County, SD Power Outage Report
In 2021, customers in Aurora County, SD went without power for an average of 0.6 hours, a total of 794 customer-hours (South Dakota average 3.4 hours). That ranks 54th worst of 61 South Dakota counties and 2790th of 2,974 nationally.
Compared with SD, the US and 2020
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Aurora County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 15, 2021 11:15 | March 15, 2021 22:45 | 11h 30m | 46 | 311 |
| 2 | February 3, 2021 15:30 | February 3, 2021 18:15 | 2h 45m | 33 | 55 |
| 3 | August 31, 2021 11:00 | August 31, 2021 22:30 | 11h 30m | 21 | 26 |
| 4 | July 15, 2021 21:00 | July 15, 2021 21:30 | 30m | 19 | 10 |
| 5 | September 10, 2021 19:00 | September 10, 2021 21:45 | 2h 45m | 15 | 41 |
| 6 | October 1, 2021 19:45 | October 1, 2021 21:45 | 2h | 15 | 24 |
| 7 | September 12, 2021 21:30 | September 12, 2021 22:30 | 1h | 14 | 8 |
| 8 | November 11, 2021 17:00 | November 11, 2021 19:30 | 2h 30m | 14 | 13 |
| 9 | October 19, 2021 22:45 | October 20, 2021 00:15 | 1h 30m | 10 | 7 |
| 10 | November 9, 2021 15:00 | November 9, 2021 19:15 | 4h 15m | 10 | 43 |
Outage episodes by size in 2021: 0 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 2021, 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) | 2021 | 1.5 hrs | 0.95 | 81 min | 0.83 |
| 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 79% of South Dakota's customers in 2021; 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, 2021, 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/2021/south-dakota/aurora-county