County annual report · FIPS 46091
2021 Marshall County, SD Power Outage Report
In 2021, customers in Marshall County, SD went without power for an average of 2.3 hours, a total of 5,873 customer-hours (South Dakota average 3.4 hours). That ranks 36th worst of 61 South Dakota counties and 2094th 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 Marshall County, 2021
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 2, 2021 17:45 | December 2, 2021 18:45 | 1h | 436 | 436 |
| 2 | July 20, 2021 18:15 | July 20, 2021 20:30 | 2h 15m | 258 | 581 |
| 3 | December 7, 2021 15:15 | December 7, 2021 20:45 | 5h 30m | 202 | 1,111 |
| 4 | April 28, 2021 21:15 | April 28, 2021 23:30 | 2h 15m | 201 | 452 |
| 5 | June 30, 2021 15:15 | June 30, 2021 15:30 | 15m | 81 | 20 |
| 6 | March 29, 2021 18:45 | March 29, 2021 20:45 | 2h | 66 | 86 |
| 7 | February 2, 2021 06:15 | February 2, 2021 07:45 | 1h 30m | 55 | 83 |
| 8 | December 15, 2021 00:45 | December 15, 2021 14:30 | 13h 45m | 55 | 192 |
| 9 | May 5, 2021 18:15 | May 6, 2021 19:15 | 1d 1h | 50 | 97 |
| 10 | March 30, 2021 04:00 | March 30, 2021 13:15 | 9h 15m | 39 | 129 |
Outage episodes by size in 2021: 4 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 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 |
|---|---|---|---|---|---|
| Otter Tail Power Co | 2021 | 86 min | 1.13 | 74 min | 1.09 |
| NorthWestern Energy - (SD) | 2021 | 1.5 hrs | 0.95 | 81 min | 0.83 |
| Northern Electric Coop, Inc | 2021 | 2.0 hrs | 1.20 | 1.9 hrs | 1.18 |
| 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 2021; 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, 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/marshall-county