County annual report · FIPS 46109
2019 Roberts County, SD Power Outage Report
In 2019, customers in Roberts County, SD went without power for an average of 0.9 hours, a total of 3,793 customer-hours (South Dakota average 3.8 hours). That ranks 33rd worst of 58 South Dakota counties and 2524th of 2,945 nationally.
Compared with SD, the US
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Roberts County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 30, 2019 02:30 | December 30, 2019 18:15 | 15h 45m | 150 | 2,077 |
| 2 | September 30, 2019 13:00 | September 30, 2019 13:45 | 45m | 38 | 29 |
| 3 | October 14, 2019 19:15 | October 15, 2019 13:45 | 18h 30m | 37 | 683 |
| 4 | December 27, 2019 17:15 | December 27, 2019 18:45 | 1h 30m | 19 | 23 |
| 5 | September 25, 2019 17:00 | September 27, 2019 19:45 | 2d 2h | 18 | 841 |
| 6 | December 29, 2019 17:30 | December 29, 2019 18:45 | 1h 15m | 10 | 11 |
| 7 | July 17, 2019 13:00 | July 17, 2019 13:30 | 30m | 8 | 4 |
| 8 | September 3, 2019 15:30 | September 3, 2019 18:00 | 2h 30m | 6 | 8 |
| 9 | December 30, 2019 20:15 | December 30, 2019 21:00 | 45m | 6 | 5 |
| 10 | July 1, 2019 13:15 | July 1, 2019 15:00 | 1h 45m | 5 | 9 |
Outage episodes by size in 2019: 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 Roberts County reported on EIA Form 861 for 2019, 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 | 2018 | 1.8 hrs | 1.30 | 1.7 hrs | 1.23 |
| Whetstone Valley Elec Coop Inc | 2018 | 73 min | 0.64 | 42 min | 0.43 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| 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 87% of South Dakota's customers in 2019; 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, 2019, 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/2019/south-dakota/roberts-county