County annual report · FIPS 46095
2025 Mellette County, SD Power Outage Report
In 2025, customers in Mellette County, SD went without power for an average of 8.7 hours, a total of 3,519 customer-hours (South Dakota average 6.5 hours). That ranks 12th worst of 65 South Dakota counties and 924th 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 Mellette 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 | April 28, 2025 22:00 | April 29, 2025 22:30 | 1d | 389 | 250 |
| 2 | September 21, 2025 12:45 | September 22, 2025 13:45 | 1d 1h | 28 | 79 |
| 3 | September 10, 2025 13:15 | September 18, 2025 21:45 | 8d 8h | 24 | 268 |
| 4 | October 9, 2025 16:45 | October 9, 2025 17:45 | 1h | 15 | 15 |
| 5 | August 29, 2025 19:15 | August 29, 2025 23:30 | 4h 15m | 11 | 27 |
| 6 | August 14, 2025 13:15 | August 14, 2025 16:45 | 3h 30m | 9 | 30 |
| 7 | May 14, 2025 22:15 | May 20, 2025 13:30 | 5d 15h | 8 | 172 |
| 8 | May 8, 2025 13:30 | May 12, 2025 19:15 | 4d 5h | 6 | 113 |
| 9 | July 27, 2025 02:15 | July 27, 2025 04:45 | 2h 30m | 6 | 9 |
| 10 | May 6, 2025 17:00 | May 6, 2025 17:30 | 30m | 5 | 3 |
Outage episodes by size in 2025: 1 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 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 |
|---|---|---|---|---|---|
| West Central Electric Coop Inc - (SD) | 2018 | 3.7 hrs | 1.25 | 1.5 hrs | 1.25 |
| Rosebud Electric Coop Inc | 2024 | 1.9 hrs | 0.84 | 1.6 hrs | 0.76 |
| LaCreek Electric Assn, Inc | - | - | - | - | - |
| Cherry-Todd 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 n/a of South Dakota's customers in 2025; 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, 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/mellette-county