County annual report · FIPS 46033
2023 Custer County, SD Power Outage Report
In 2023, customers in Custer County, SD went without power for an average of 3.5 hours, a total of 16K customer-hours (South Dakota average 2.3 hours). That ranks 18th worst of 61 South Dakota counties and 1811th 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 Custer 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 | July 27, 2023 07:00 | September 6, 2023 17:00 | 41d 10h | 1,386 | 11K |
| 2 | June 28, 2023 14:15 | June 28, 2023 14:30 | 15m | 106 | 27 |
| 3 | June 18, 2023 10:30 | June 18, 2023 12:45 | 2h 15m | 74 | 130 |
| 4 | June 14, 2023 01:30 | June 16, 2023 13:00 | 2d 11h | 70 | 270 |
| 5 | July 4, 2023 01:15 | July 4, 2023 03:30 | 2h 15m | 70 | 141 |
| 6 | July 25, 2023 05:30 | July 25, 2023 17:00 | 11h 30m | 70 | 449 |
| 7 | December 7, 2023 17:45 | December 7, 2023 20:45 | 3h | 60 | 136 |
| 8 | April 4, 2023 05:00 | April 4, 2023 16:15 | 11h 15m | 50 | 407 |
| 9 | June 28, 2023 21:00 | June 28, 2023 22:00 | 1h | 50 | 17 |
| 10 | September 18, 2023 16:00 | September 18, 2023 16:30 | 30m | 49 | 25 |
Outage episodes by size in 2023: 2 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 Custer 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 | - | - | - | - | - |
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 ÷ 4,481 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. Custer County has data for 2016–2025.
Cite this report
MassOutage (massoutage.com), Custer 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/custer-county