County annual report · FIPS 46033
2020 Custer County, SD Power Outage Report
In 2020, customers in Custer County, SD went without power for an average of 5.5 hours, a total of 25K customer-hours (South Dakota average 4.6 hours). That ranks 18th worst of 62 South Dakota counties and 1314th 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 Custer 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 18, 2020 14:00 | October 19, 2020 18:00 | 1d 4h | 704 | 2,353 |
| 2 | October 26, 2020 12:30 | October 26, 2020 16:30 | 4h | 703 | 963 |
| 3 | February 21, 2020 21:45 | February 21, 2020 22:00 | 15m | 551 | 138 |
| 4 | December 23, 2020 09:00 | December 23, 2020 23:00 | 14h | 545 | 2,185 |
| 5 | July 6, 2020 02:00 | July 6, 2020 07:30 | 5h 30m | 537 | 2,024 |
| 6 | April 16, 2020 16:00 | April 16, 2020 19:15 | 3h 15m | 313 | 148 |
| 7 | May 14, 2020 12:15 | May 19, 2020 18:45 | 5d 6h | 286 | 1,153 |
| 8 | February 17, 2020 15:45 | February 18, 2020 15:30 | 23h 45m | 181 | 3,937 |
| 9 | May 21, 2020 00:15 | May 22, 2020 12:30 | 1d 12h | 118 | 433 |
| 10 | June 4, 2020 11:30 | June 7, 2020 16:30 | 3d 5h | 110 | 472 |
Outage episodes by size in 2020: 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 Custer 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 | - | - | - | - | - |
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 ÷ 4,481 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, 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/custer-county