County annual report · FIPS 46091
2020 Marshall County, SD Power Outage Report
In 2020, customers in Marshall County, SD went without power for an average of 8.2 hours, a total of 21K customer-hours (South Dakota average 4.6 hours). That ranks 8th worst of 62 South Dakota counties and 934th 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 Marshall 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 | August 21, 2020 21:30 | August 24, 2020 13:15 | 2d 15h | 834 | 2,436 |
| 2 | August 25, 2020 13:45 | August 25, 2020 18:45 | 5h | 833 | 3,472 |
| 3 | July 25, 2020 04:15 | July 25, 2020 06:15 | 2h | 822 | 850 |
| 4 | April 28, 2020 07:30 | April 28, 2020 12:45 | 5h 15m | 682 | 922 |
| 5 | September 9, 2020 14:15 | September 11, 2020 14:15 | 2d | 676 | 5,062 |
| 6 | September 26, 2020 00:00 | September 26, 2020 22:15 | 22h 15m | 633 | 1,250 |
| 7 | April 8, 2020 20:00 | April 8, 2020 22:00 | 2h | 418 | 480 |
| 8 | July 8, 2020 06:30 | July 8, 2020 06:45 | 15m | 418 | 105 |
| 9 | July 11, 2020 04:45 | July 11, 2020 05:00 | 15m | 418 | 105 |
| 10 | January 26, 2020 17:30 | January 26, 2020 20:30 | 3h | 163 | 131 |
Outage episodes by size in 2020: 12 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 Marshall 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 |
|---|---|---|---|---|---|
| Otter Tail Power Co | 2020 | 1.6 hrs | 1.40 | 1.6 hrs | 1.40 |
| NorthWestern Energy - (SD) | 2020 | 2.6 hrs | 1.54 | 1.9 hrs | 1.28 |
| Northern Electric Coop, Inc | 2020 | 1.7 hrs | 0.62 | 1.6 hrs | 0.56 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Traverse Electric Coop, Inc | - | - | - | - | - |
| Lake Region Electric Assn, Inc - (SD) | - | - | - | - | - |
| Town of Langford- (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 ÷ 2,509 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. Marshall County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Marshall 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/marshall-county