County annual report · FIPS 46019
2021 Butte County, SD Power Outage Report
In 2021, customers in Butte County, SD went without power for an average of 4.7 hours, a total of 22K customer-hours (South Dakota average 3.4 hours). That ranks 14th worst of 61 South Dakota counties and 1400th 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 Butte 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 | January 19, 2021 20:45 | January 19, 2021 21:15 | 30m | 395 | 198 |
| 2 | September 18, 2021 18:00 | September 18, 2021 19:45 | 1h 45m | 209 | 366 |
| 3 | September 19, 2021 19:45 | September 19, 2021 21:30 | 1h 45m | 209 | 341 |
| 4 | October 4, 2021 16:00 | October 4, 2021 16:45 | 45m | 203 | 152 |
| 5 | May 20, 2021 00:00 | June 1, 2021 15:15 | 12d 15h | 181 | 1,425 |
| 6 | January 14, 2021 08:30 | January 14, 2021 09:15 | 45m | 174 | 87 |
| 7 | January 14, 2021 10:00 | January 14, 2021 10:30 | 30m | 174 | 87 |
| 8 | September 15, 2021 20:00 | September 15, 2021 20:45 | 45m | 174 | 131 |
| 9 | December 15, 2021 21:30 | December 15, 2021 23:00 | 1h 30m | 168 | 91 |
| 10 | June 11, 2021 08:45 | June 25, 2021 21:30 | 14d 12h | 167 | 1,110 |
Outage episodes by size in 2021: 12 reached 100+ customers, 0 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 Butte 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 |
|---|---|---|---|---|---|
| Black Hills Power, Inc. | 2021 | 2.6 hrs | 1.17 | 41 min | 0.32 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Grand Electric Coop, Inc | - | - | - | - | - |
| Butte Electric Coop, Inc | - | - | - | - | - |
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 ÷ 4,717 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. Butte County has data for 2016–2025.
Cite this report
MassOutage (massoutage.com), Butte 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/butte-county