County annual report · FIPS 46023
2021 Charles Mix County, SD Power Outage Report
In 2021, customers in Charles Mix County, SD went without power for an average of 2.5 hours, a total of 12K customer-hours (South Dakota average 3.4 hours). That ranks 35th worst of 61 South Dakota counties and 2053rd 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 Charles Mix 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 | February 16, 2021 15:00 | February 16, 2021 17:45 | 2h 45m | 1,464 | 4,026 |
| 2 | February 23, 2021 09:30 | February 23, 2021 11:00 | 1h 30m | 1,162 | 1,743 |
| 3 | December 16, 2021 00:00 | December 16, 2021 06:00 | 6h | 386 | 1,145 |
| 4 | February 23, 2021 15:45 | February 23, 2021 16:45 | 1h | 272 | 272 |
| 5 | May 10, 2021 20:45 | May 10, 2021 21:00 | 15m | 260 | 65 |
| 6 | May 11, 2021 20:45 | May 11, 2021 23:00 | 2h 15m | 260 | 585 |
| 7 | September 23, 2021 09:00 | September 23, 2021 13:00 | 4h | 234 | 936 |
| 8 | October 14, 2021 05:30 | October 14, 2021 12:00 | 6h 30m | 205 | 1,282 |
| 9 | December 22, 2021 04:45 | December 22, 2021 06:45 | 2h | 205 | 256 |
| 10 | July 11, 2021 17:30 | July 11, 2021 21:30 | 4h | 137 | 483 |
Outage episodes by size in 2021: 10 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 Charles Mix 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 | - | - | - | - | - |
| 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 79% of South Dakota's customers in 2021; 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, 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/charles-mix-county