County annual report · FIPS 46023
2025 Charles Mix County, SD Power Outage Report
In 2025, customers in Charles Mix County, SD went without power for an average of 0.9 hours, a total of 4,207 customer-hours (South Dakota average 6.5 hours). That ranks 57th worst of 65 South Dakota counties and 2799th 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 Charles Mix 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 | July 29, 2025 00:00 | July 29, 2025 06:45 | 6h 45m | 631 | 1,910 |
| 2 | September 10, 2025 15:45 | September 10, 2025 17:15 | 1h 30m | 462 | 578 |
| 3 | July 16, 2025 00:30 | July 16, 2025 02:15 | 1h 45m | 216 | 230 |
| 4 | April 25, 2025 16:30 | April 26, 2025 00:15 | 7h 45m | 33 | 256 |
| 5 | November 4, 2025 15:45 | November 4, 2025 18:45 | 3h | 27 | 81 |
| 6 | May 23, 2025 21:00 | May 23, 2025 23:45 | 2h 45m | 18 | 45 |
| 7 | August 25, 2025 18:00 | August 26, 2025 01:00 | 7h | 18 | 44 |
| 8 | August 28, 2025 22:00 | August 29, 2025 00:30 | 2h 30m | 18 | 45 |
| 9 | July 30, 2025 18:30 | July 30, 2025 20:45 | 2h 15m | 17 | 38 |
| 10 | October 21, 2025 15:15 | October 21, 2025 21:30 | 6h 15m | 17 | 62 |
Outage episodes by size in 2025: 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 Charles Mix 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 | - | - | - | - | - |
| Douglas Electric Coop, Inc | - | - | - | - | - |
| Charles Mix Electric Assn, Inc | - | - | - | - | - |
| Town of Pickstown - (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 ÷ 4,915 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. Charles Mix County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Charles Mix 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/charles-mix-county