County annual report · FIPS 46013
2021 Brown County, SD Power Outage Report
In 2021, customers in Brown County, SD went without power for an average of 1.1 hours, a total of 22K customer-hours (South Dakota average 3.4 hours). That ranks 50th worst of 61 South Dakota counties and 2608th 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 Brown 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 | February 16, 2021 14:30 | February 16, 2021 17:30 | 3h | 3,279 | 6,558 |
| 2 | September 4, 2021 14:00 | September 4, 2021 16:15 | 2h 15m | 1,333 | 2,074 |
| 3 | September 20, 2021 20:15 | September 20, 2021 22:15 | 2h | 1,332 | 2,663 |
| 4 | May 28, 2021 15:30 | May 28, 2021 18:00 | 2h 30m | 840 | 855 |
| 5 | July 26, 2021 13:45 | July 26, 2021 17:15 | 3h 30m | 531 | 1,721 |
| 6 | November 21, 2021 10:15 | November 21, 2021 15:30 | 5h 15m | 286 | 858 |
| 7 | July 14, 2021 10:15 | July 14, 2021 12:00 | 1h 45m | 265 | 464 |
| 8 | August 3, 2021 10:00 | August 3, 2021 10:45 | 45m | 265 | 199 |
| 9 | December 21, 2021 14:30 | December 22, 2021 02:00 | 11h 30m | 245 | 447 |
| 10 | March 10, 2021 23:00 | March 11, 2021 01:45 | 2h 45m | 238 | 655 |
Outage episodes by size in 2021: 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 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 |
|---|---|---|---|---|---|
| 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 | - | - | - | - | - |
| 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 79% of South Dakota's customers in 2021; 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, 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/brown-county