County annual report · FIPS 46023
2020 Charles Mix County, SD Power Outage Report
In 2020, customers in Charles Mix County, SD went without power for an average of 6.4 hours, a total of 31K customer-hours (South Dakota average 4.6 hours). That ranks 13th worst of 62 South Dakota counties and 1177th of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Charles Mix County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 5, 2020 08:00 | October 5, 2020 10:45 | 2h 45m | 1,464 | 4,023 |
| 2 | June 9, 2020 11:45 | June 9, 2020 22:45 | 11h | 1,364 | 6,000 |
| 3 | July 3, 2020 06:15 | July 3, 2020 10:30 | 4h 15m | 1,209 | 4,668 |
| 4 | February 20, 2020 12:30 | February 20, 2020 22:30 | 10h | 1,177 | 3,502 |
| 5 | November 9, 2020 01:00 | November 9, 2020 04:15 | 3h 15m | 947 | 1,936 |
| 6 | July 1, 2020 04:45 | July 1, 2020 08:30 | 3h 45m | 934 | 2,397 |
| 7 | June 26, 2020 22:30 | June 27, 2020 00:45 | 2h 15m | 930 | 1,925 |
| 8 | December 23, 2020 17:15 | December 23, 2020 23:00 | 5h 45m | 299 | 1,441 |
| 9 | October 8, 2020 13:15 | October 8, 2020 15:30 | 2h 15m | 265 | 338 |
| 10 | October 9, 2020 13:15 | October 9, 2020 14:30 | 1h 15m | 238 | 298 |
Outage episodes by size in 2020: 15 reached 100+ customers, 4 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 2020, 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) | 2020 | 2.6 hrs | 1.54 | 1.9 hrs | 1.28 |
| 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 2020; 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, 2020, 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/2020/south-dakota/charles-mix-county