County annual report · FIPS 46013
2024 Brown County, SD Power Outage Report
In 2024, customers in Brown County, SD went without power for an average of 1.3 hours, a total of 24K customer-hours (South Dakota average 2.3 hours). That ranks 42nd worst of 65 South Dakota counties and 2641st of 2,990 nationally.
Compared with SD, the US and 2023
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Brown County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 31, 2024 16:00 | July 31, 2024 18:00 | 2h | 2,920 | 2,346 |
| 2 | June 18, 2024 08:15 | June 18, 2024 18:45 | 10h 30m | 2,058 | 11K |
| 3 | August 20, 2024 21:15 | August 20, 2024 23:15 | 2h | 640 | 1,131 |
| 4 | May 6, 2024 13:15 | May 6, 2024 17:30 | 4h 15m | 570 | 327 |
| 5 | November 19, 2024 14:00 | November 19, 2024 23:30 | 9h 30m | 551 | 1,672 |
| 6 | October 29, 2024 15:15 | October 29, 2024 17:45 | 2h 30m | 464 | 1,160 |
| 7 | June 12, 2024 21:15 | June 12, 2024 22:00 | 45m | 292 | 219 |
| 8 | April 10, 2024 14:15 | April 10, 2024 18:45 | 4h 30m | 159 | 160 |
| 9 | October 8, 2024 19:30 | October 8, 2024 21:30 | 2h | 138 | 276 |
| 10 | January 30, 2024 22:45 | January 31, 2024 02:45 | 4h | 120 | 243 |
Outage episodes by size in 2024: 11 reached 100+ customers, 2 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 2024, 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 2024; 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, 2024, 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/2024/south-dakota/brown-county