County annual report · FIPS 46047
2020 Fall River County, SD Power Outage Report
In 2020, customers in Fall River County, SD went without power for an average of 4.7 hours, a total of 19K customer-hours (South Dakota average 4.6 hours). That ranks 26th worst of 62 South Dakota counties and 1457th of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Fall River County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 12, 2020 14:15 | October 12, 2020 20:30 | 6h 15m | 1,459 | 9,119 |
| 2 | October 18, 2020 14:00 | October 18, 2020 16:15 | 2h 15m | 456 | 907 |
| 3 | October 18, 2020 17:15 | October 18, 2020 20:15 | 3h | 456 | 573 |
| 4 | June 13, 2020 18:30 | June 13, 2020 19:30 | 1h | 452 | 199 |
| 5 | October 19, 2020 14:30 | October 19, 2020 14:45 | 15m | 291 | 73 |
| 6 | August 28, 2020 01:15 | September 3, 2020 20:45 | 6d 19h | 173 | 4,310 |
| 7 | October 26, 2020 12:30 | October 26, 2020 16:30 | 4h | 165 | 320 |
| 8 | April 27, 2020 22:00 | April 27, 2020 22:30 | 30m | 156 | 78 |
| 9 | August 9, 2020 12:45 | August 9, 2020 14:45 | 2h | 152 | 229 |
| 10 | June 7, 2020 00:00 | June 7, 2020 16:30 | 16h 30m | 123 | 681 |
Outage episodes by size in 2020: 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 Fall River County reported on EIA Form 861 for 2020, 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. | 2020 | 63 min | 0.56 | 30 min | 0.36 |
| Black Hills Electric Coop, Inc | 2020 | 3.7 hrs | 1.16 | 3.7 hrs | 1.16 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Niobrara Electric Assn, Inc | - | - | - | - | - |
| Black Hills Energy | - | - | - | - | - |
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 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,055 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. Fall River County has data for 2016–2025.
Cite this report
MassOutage (massoutage.com), Fall River County, SD annual power outage report, 2020, 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/2020/south-dakota/fall-river-county