County annual report · FIPS 46011
2021 Brookings County, SD Power Outage Report
In 2021, customers in Brookings County, SD went without power for an average of 1.4 hours, a total of 26K customer-hours (South Dakota average 3.4 hours). That ranks 47th worst of 61 South Dakota counties and 2523rd 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 Brookings 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 | May 18, 2021 17:15 | September 28, 2021 13:30 | 132d 20h | 2,002 | 22K |
| 2 | March 30, 2021 02:30 | March 30, 2021 03:00 | 30m | 453 | 227 |
| 3 | March 29, 2021 18:45 | March 29, 2021 20:00 | 1h 15m | 238 | 224 |
| 4 | May 11, 2021 14:15 | May 11, 2021 15:30 | 1h 15m | 226 | 173 |
| 5 | March 10, 2021 20:30 | March 10, 2021 21:30 | 1h | 192 | 180 |
| 6 | February 2, 2021 15:15 | February 2, 2021 16:30 | 1h 15m | 177 | 221 |
| 7 | October 25, 2021 14:15 | October 25, 2021 15:00 | 45m | 152 | 42 |
| 8 | November 22, 2021 15:15 | November 22, 2021 18:00 | 2h 45m | 127 | 214 |
| 9 | May 5, 2021 14:15 | May 5, 2021 16:15 | 2h | 114 | 121 |
| 10 | December 21, 2021 14:30 | December 21, 2021 14:45 | 15m | 106 | 27 |
Outage episodes by size in 2021: 10 reached 100+ customers, 1 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 Brookings 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 |
|---|---|---|---|---|---|
| Otter Tail Power Co | 2021 | 86 min | 1.13 | 74 min | 1.09 |
| Sioux Valley SW Elec Coop | 2021 | 1.8 hrs | 1.08 | 1.5 hrs | 0.93 |
| H-D Electric Coop Inc | 2018 | 2.6 hrs | 1.52 | 1.6 hrs | 1.14 |
| City of Brookings - (SD) | 2021 | 4 min | 0.05 | 4 min | 0.05 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Kingsbury Electric Coop, Inc | - | - | - | - | - |
| City of Arlington - (SD) | - | - | - | - | - |
| City of Aurora - (SD) | - | - | - | - | - |
| City of Volga - (SD) | - | - | - | - | - |
| City of White - (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 79% of South Dakota's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 19,030 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. Brookings County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Brookings 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/brookings-county