County annual report · FIPS 46033
2019 Custer County, SD Power Outage Report
In 2019, customers in Custer County, SD went without power for an average of 5.2 hours, a total of 24K customer-hours (South Dakota average 3.8 hours). That ranks 10th worst of 58 South Dakota counties and 1045th of 2,945 nationally.
Compared with SD, the US and 2018
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Custer County, 2019
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 22, 2019 10:45 | May 22, 2019 12:45 | 2h | 1,649 | 2,911 |
| 2 | November 30, 2019 18:30 | December 1, 2019 05:15 | 10h 45m | 1,506 | 14K |
| 3 | May 22, 2019 13:30 | May 22, 2019 15:30 | 2h | 986 | 1,968 |
| 4 | May 21, 2019 17:00 | May 21, 2019 18:00 | 1h | 654 | 466 |
| 5 | May 23, 2019 18:15 | May 23, 2019 18:45 | 30m | 286 | 143 |
| 6 | May 21, 2019 23:45 | May 22, 2019 06:15 | 6h 30m | 256 | 1,404 |
| 7 | August 31, 2019 14:15 | August 31, 2019 16:30 | 2h 15m | 113 | 142 |
| 8 | October 20, 2019 23:30 | October 21, 2019 07:00 | 7h 30m | 112 | 375 |
| 9 | November 3, 2019 22:45 | November 4, 2019 00:15 | 1h 30m | 67 | 98 |
| 10 | August 14, 2019 18:15 | August 14, 2019 18:45 | 30m | 66 | 18 |
Outage episodes by size in 2019: 8 reached 100+ customers, 2 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 2019, 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. | 2018 | 3.8 hrs | 1.21 | 3.7 hrs | 1.17 |
| Black Hills Electric Coop, Inc | 2018 | 68 min | 0.92 | 68 min | 0.92 |
| 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 87% of South Dakota's customers in 2019; 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, 2019, 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/2019/south-dakota/custer-county