County annual report · FIPS 46009
2021 Bon Homme County, SD Power Outage Report
In 2021, customers in Bon Homme County, SD went without power for an average of 0.3 hours, a total of 834 customer-hours (South Dakota average 3.4 hours). That ranks 56th worst of 61 South Dakota counties and 2861st 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 Bon Homme 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 | May 6, 2021 13:45 | May 6, 2021 17:15 | 3h 30m | 62 | 217 |
| 2 | November 19, 2021 15:30 | November 19, 2021 17:45 | 2h 15m | 44 | 99 |
| 3 | December 13, 2021 17:00 | December 13, 2021 21:00 | 4h | 33 | 74 |
| 4 | June 24, 2021 14:00 | June 24, 2021 17:45 | 3h 45m | 30 | 113 |
| 5 | January 10, 2021 22:45 | January 10, 2021 23:45 | 1h | 25 | 25 |
| 6 | January 9, 2021 18:15 | January 9, 2021 19:30 | 1h 15m | 18 | 23 |
| 7 | January 12, 2021 21:45 | January 12, 2021 23:45 | 2h | 9 | 18 |
| 8 | May 10, 2021 14:15 | May 10, 2021 15:30 | 1h 15m | 9 | 11 |
| 9 | December 19, 2021 00:30 | December 19, 2021 04:15 | 3h 45m | 7 | 25 |
| 10 | January 12, 2021 19:30 | January 12, 2021 20:15 | 45m | 6 | 5 |
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 Bon Homme 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 |
| Bon Homme Yankton El Assn, Inc | 2018 | 34 min | 0.32 | 34 min | 0.32 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Southeastern Electric Coop Inc - (SD) | - | - | - | - | - |
| Charles Mix Electric Assn, Inc | - | - | - | - | - |
| City of Tyndall - (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 ÷ 2,917 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. Bon Homme County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Bon Homme 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/bon-homme-county