County annual report · FIPS 46009
2025 Bon Homme County, SD Power Outage Report
In 2025, customers in Bon Homme County, SD went without power for an average of 7.6 hours, a total of 22K customer-hours (South Dakota average 6.5 hours). That ranks 15th worst of 65 South Dakota counties and 1065th 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 Bon Homme 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 | March 15, 2025 10:15 | March 15, 2025 18:45 | 8h 30m | 4,222 | 11K |
| 2 | November 30, 2025 17:30 | November 30, 2025 21:30 | 4h | 2,155 | 6,616 |
| 3 | December 16, 2025 21:15 | December 16, 2025 23:15 | 2h | 526 | 1,052 |
| 4 | July 29, 2025 01:15 | July 29, 2025 09:00 | 7h 45m | 470 | 1,185 |
| 5 | November 19, 2025 13:15 | November 19, 2025 23:30 | 10h 15m | 154 | 433 |
| 6 | October 27, 2025 18:00 | October 27, 2025 18:30 | 30m | 146 | 41 |
| 7 | March 1, 2025 03:00 | March 1, 2025 07:15 | 4h 15m | 71 | 302 |
| 8 | November 13, 2025 13:15 | November 13, 2025 23:15 | 10h | 34 | 106 |
| 9 | September 30, 2025 18:15 | September 30, 2025 22:45 | 4h 30m | 32 | 20 |
| 10 | May 15, 2025 05:00 | May 15, 2025 08:45 | 3h 45m | 31 | 80 |
Outage episodes by size in 2025: 6 reached 100+ customers, 2 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 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 |
| 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 n/a of South Dakota's customers in 2025; 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, 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/bon-homme-county