County annual report · FIPS 46095
2021 Mellette County, SD Power Outage Report
In 2021, customers in Mellette County, SD went without power for an average of 1.9 hours, a total of 748 customer-hours (South Dakota average 3.4 hours). That ranks 42nd worst of 61 South Dakota counties and 2289th 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 Mellette County, 2021
The 8 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 14, 2021 22:15 | March 17, 2021 12:30 | 2d 14h | 25 | 586 |
| 2 | October 5, 2021 11:00 | October 5, 2021 12:15 | 1h 15m | 15 | 19 |
| 3 | March 29, 2021 18:00 | March 30, 2021 00:15 | 6h 15m | 8 | 40 |
| 4 | March 30, 2021 01:00 | March 30, 2021 01:30 | 30m | 8 | 4 |
| 5 | August 25, 2021 13:15 | August 25, 2021 14:30 | 1h 15m | 5 | 6 |
| 6 | January 15, 2021 21:30 | January 15, 2021 23:00 | 1h 30m | 2 | 3 |
| 7 | February 10, 2021 18:00 | February 12, 2021 13:45 | 1d 19h | 2 | 87 |
| 8 | July 12, 2021 16:15 | July 12, 2021 20:30 | 4h 15m | 1 | 4 |
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 Mellette 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 |
|---|---|---|---|---|---|
| West Central Electric Coop Inc - (SD) | 2018 | 3.7 hrs | 1.25 | 1.5 hrs | 1.25 |
| LaCreek Electric Assn, Inc | - | - | - | - | - |
| Cherry-Todd Electric Coop, Inc | - | - | - | - | - |
| Rosebud Electric Coop Inc | - | - | - | - | - |
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 ÷ 403 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. Mellette County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Mellette 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/mellette-county