County annual report · FIPS 46109
2025 Roberts County, SD Power Outage Report
In 2025, customers in Roberts County, SD went without power for an average of 6.5 hours, a total of 26K customer-hours (South Dakota average 6.5 hours). That ranks 20th worst of 65 South Dakota counties and 1227th 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 Roberts 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 | November 25, 2025 19:00 | November 26, 2025 19:15 | 1d | 956 | 3,214 |
| 2 | July 29, 2025 00:00 | July 29, 2025 03:30 | 3h 30m | 561 | 823 |
| 3 | December 25, 2025 20:45 | December 26, 2025 03:15 | 6h 30m | 538 | 2,249 |
| 4 | March 23, 2025 03:45 | March 23, 2025 05:45 | 2h | 537 | 866 |
| 5 | May 15, 2025 09:30 | May 15, 2025 12:30 | 3h | 452 | 1,246 |
| 6 | December 29, 2025 21:15 | December 29, 2025 22:30 | 1h 15m | 383 | 165 |
| 7 | July 25, 2025 13:45 | July 25, 2025 15:15 | 1h 30m | 281 | 422 |
| 8 | February 23, 2025 18:15 | February 23, 2025 19:45 | 1h 30m | 224 | 299 |
| 9 | June 21, 2025 03:00 | June 21, 2025 08:15 | 5h 15m | 208 | 941 |
| 10 | June 21, 2025 14:00 | June 21, 2025 19:45 | 5h 45m | 208 | 387 |
Outage episodes by size in 2025: 34 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 Roberts 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 |
|---|---|---|---|---|---|
| Otter Tail Power Co | 2024 | 2.6 hrs | 1.37 | 1.9 hrs | 1.09 |
| Montana-Dakota Utilities Co | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| Whetstone Valley Elec Coop Inc | 2018 | 73 min | 0.64 | 42 min | 0.43 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Codington-Clark Elec Coop, Inc | - | - | - | - | - |
| Traverse Electric Coop, Inc | - | - | - | - | - |
| Lake Region Electric Assn, Inc - (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 ÷ 4,096 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. Roberts County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Roberts 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/roberts-county