County annual report · FIPS 46047
2023 Fall River County, SD Power Outage Report
In 2023, customers in Fall River County, SD went without power for an average of 7.5 hours, a total of 30K customer-hours (South Dakota average 2.3 hours). That ranks 7th worst of 61 South Dakota counties and 1079th 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 Fall River 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 | September 23, 2023 16:15 | September 23, 2023 22:15 | 6h | 2,235 | 8,231 |
| 2 | September 11, 2023 20:30 | September 11, 2023 20:45 | 15m | 2,233 | 558 |
| 3 | June 28, 2023 19:15 | June 28, 2023 21:00 | 1h 45m | 1,366 | 709 |
| 4 | September 20, 2023 18:15 | September 20, 2023 18:30 | 15m | 669 | 167 |
| 5 | August 4, 2023 20:45 | August 4, 2023 21:15 | 30m | 667 | 334 |
| 6 | August 9, 2023 03:30 | August 9, 2023 07:00 | 3h 30m | 302 | 467 |
| 7 | April 19, 2023 02:00 | April 19, 2023 12:30 | 10h 30m | 188 | 618 |
| 8 | August 30, 2023 16:30 | August 30, 2023 17:00 | 30m | 175 | 60 |
| 9 | July 23, 2023 18:45 | July 23, 2023 23:45 | 5h | 173 | 773 |
| 10 | July 17, 2023 16:15 | July 17, 2023 19:30 | 3h 15m | 164 | 357 |
Outage episodes by size in 2023: 14 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 Fall River 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 |
|---|---|---|---|---|---|
| Black Hills Power, Inc. | 2023 | 66 min | 0.77 | 64 min | 0.74 |
| Black Hills Electric Coop, Inc | 2023 | 2.7 hrs | 0.78 | 88 min | 0.62 |
| 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 n/a of South Dakota's customers in 2023; 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, 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/fall-river-county