County annual report · FIPS 46013
2023 Brown County, SD Power Outage Report
In 2023, customers in Brown County, SD went without power for an average of 2.5 hours, a total of 48K customer-hours (South Dakota average 2.3 hours). That ranks 25th worst of 61 South Dakota counties and 2122nd of 2,977 nationally.
Compared with SD, the US and 2022
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Brown County, 2023
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 29, 2023 15:15 | August 29, 2023 19:15 | 4h | 6,685 | 8,810 |
| 2 | May 23, 2023 15:45 | May 23, 2023 18:15 | 2h 30m | 3,268 | 5,025 |
| 3 | September 14, 2023 22:45 | September 15, 2023 05:15 | 6h 30m | 1,570 | 10K |
| 4 | July 26, 2023 20:45 | July 27, 2023 05:15 | 8h 30m | 957 | 3,467 |
| 5 | July 6, 2023 22:30 | July 7, 2023 05:15 | 6h 45m | 956 | 3,686 |
| 6 | July 4, 2023 05:15 | July 4, 2023 08:45 | 3h 30m | 782 | 1,663 |
| 7 | December 26, 2023 00:30 | December 26, 2023 06:15 | 5h 45m | 629 | 2,270 |
| 8 | July 12, 2023 22:00 | July 13, 2023 04:00 | 6h | 481 | 2,646 |
| 9 | July 19, 2023 22:00 | July 20, 2023 06:30 | 8h 30m | 478 | 4,063 |
| 10 | April 27, 2023 16:00 | April 27, 2023 17:15 | 1h 15m | 462 | 578 |
Outage episodes by size in 2023: 16 reached 100+ customers, 3 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 2023, 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 |
|---|---|---|---|---|---|
| NorthWestern Energy - (SD) | 2023 | 1.9 hrs | 1.37 | 74 min | 1.03 |
| Northern Electric Coop, Inc | 2023 | 74 min | 0.67 | 54 min | 0.55 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| 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 2023; 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, 2023, 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/2023/south-dakota/brown-county