County annual report · FIPS 46091
2025 Marshall County, SD Power Outage Report
In 2025, customers in Marshall County, SD went without power for an average of 14.6 hours, a total of 37K customer-hours (South Dakota average 6.5 hours). That ranks 7th worst of 65 South Dakota counties and 524th 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 Marshall 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 | August 16, 2025 10:15 | August 16, 2025 13:00 | 2h 45m | 692 | 377 |
| 2 | October 8, 2025 14:15 | October 9, 2025 19:45 | 1d 5h | 429 | 12K |
| 3 | December 18, 2025 17:15 | December 18, 2025 20:15 | 3h | 339 | 498 |
| 4 | November 25, 2025 19:15 | November 26, 2025 16:45 | 21h 30m | 310 | 1,397 |
| 5 | September 17, 2025 20:15 | September 17, 2025 21:30 | 1h 15m | 148 | 185 |
| 6 | August 11, 2025 19:30 | August 12, 2025 17:15 | 21h 45m | 126 | 1,827 |
| 7 | October 2, 2025 16:45 | October 2, 2025 19:15 | 2h 30m | 114 | 197 |
| 8 | August 18, 2025 18:30 | August 18, 2025 22:15 | 3h 45m | 113 | 397 |
| 9 | August 21, 2025 20:30 | August 28, 2025 14:45 | 6d 18h | 110 | 13K |
| 10 | March 30, 2025 03:00 | March 30, 2025 08:15 | 5h 15m | 106 | 439 |
Outage episodes by size in 2025: 11 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 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 |
| NorthWestern Energy - (SD) | 2024 | 76 min | 0.70 | 66 min | 0.65 |
| Northern Electric Coop, Inc | 2024 | 50 min | 0.67 | 50 min | 0.67 |
| 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 n/a of South Dakota's customers in 2025; 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, 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/marshall-county