County annual report · FIPS 46013
2025 Brown County, SD Power Outage Report
In 2025, customers in Brown County, SD went without power for an average of 1.9 hours, a total of 36K customer-hours (South Dakota average 6.5 hours). That ranks 42nd worst of 65 South Dakota counties and 2461st 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 Brown 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 | October 29, 2025 18:45 | October 29, 2025 20:45 | 2h | 1,838 | 3,669 |
| 2 | December 10, 2025 04:45 | December 10, 2025 09:15 | 4h 30m | 1,687 | 4,708 |
| 3 | November 25, 2025 16:45 | November 25, 2025 23:00 | 6h 15m | 1,573 | 5,426 |
| 4 | October 17, 2025 16:00 | October 17, 2025 20:30 | 4h 30m | 1,568 | 3,532 |
| 5 | October 21, 2025 07:15 | October 21, 2025 10:15 | 3h | 1,124 | 3,090 |
| 6 | August 6, 2025 00:00 | August 6, 2025 06:45 | 6h 45m | 984 | 3,008 |
| 7 | October 12, 2025 11:15 | October 12, 2025 13:00 | 1h 45m | 906 | 1,584 |
| 8 | May 30, 2025 02:15 | May 30, 2025 04:30 | 2h 15m | 875 | 1,969 |
| 9 | August 22, 2025 15:15 | August 22, 2025 16:45 | 1h 30m | 874 | 1,093 |
| 10 | July 21, 2025 08:00 | July 21, 2025 11:00 | 3h | 372 | 932 |
Outage episodes by size in 2025: 16 reached 100+ customers, 5 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 Brown 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 |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| 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 | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| Lake Region Electric Assn, Inc - (SD) | - | - | - | - | - |
| City of Groton - (SD) | - | - | - | - | - |
| City of Hecla | - | - | - | - | - |
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 ÷ 19,238 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. Brown County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Brown 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/brown-county