County annual report · FIPS 46065
2021 Hughes County, SD Power Outage Report
In 2021, customers in Hughes County, SD went without power for an average of 0.1 hours, a total of 2,122 customer-hours (South Dakota average 3.4 hours). That ranks 58th worst of 61 South Dakota counties and 2903rd 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 Hughes County, 2021
The 9 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 14, 2021 16:00 | September 14, 2021 17:15 | 1h 15m | 374 | 422 |
| 2 | July 14, 2021 08:00 | July 14, 2021 12:00 | 4h | 366 | 1,400 |
| 3 | January 5, 2021 00:00 | January 5, 2021 02:45 | 2h 45m | 123 | 155 |
| 4 | April 5, 2021 15:30 | April 5, 2021 23:15 | 7h 45m | 20 | 78 |
| 5 | April 21, 2021 18:15 | April 21, 2021 21:30 | 3h 15m | 10 | 30 |
| 6 | March 31, 2021 15:30 | March 31, 2021 21:15 | 5h 45m | 7 | 27 |
| 7 | April 20, 2021 18:30 | April 20, 2021 19:30 | 1h | 7 | 6 |
| 8 | July 17, 2021 14:30 | July 17, 2021 16:30 | 2h | 1 | 2 |
| 9 | August 17, 2021 14:00 | August 17, 2021 16:00 | 2h | 1 | 2 |
Outage episodes by size in 2021: 3 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 Hughes 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 | - | - | - | - | - |
| Oahe Electric Coop Inc | - | - | - | - | - |
| City of Pierre - (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 ÷ 14,362 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. Hughes County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Hughes 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/hughes-county