County annual report · FIPS 46033
2017 Custer County, SD Power Outage Report
In 2017, customers in Custer County, SD went without power for an average of 2.8 hours, a total of 13K customer-hours (South Dakota average 0.8 hours). That ranks 3rd worst of 26 South Dakota counties and 1378th of 2,786 nationally.
Compared with SD, the US and 2016
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Custer County, 2017
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 27, 2017 23:15 | June 29, 2017 00:00 | 1d | 779 | 6,008 |
| 2 | March 22, 2017 06:45 | March 22, 2017 09:15 | 2h 30m | 554 | 691 |
| 3 | December 21, 2017 14:15 | December 22, 2017 00:45 | 10h 30m | 270 | 653 |
| 4 | July 20, 2017 06:00 | July 20, 2017 07:30 | 1h 30m | 252 | 378 |
| 5 | December 11, 2017 15:30 | December 14, 2017 23:00 | 3d 7h | 143 | 3,727 |
| 6 | July 27, 2017 18:30 | July 27, 2017 23:00 | 4h 30m | 90 | 200 |
| 7 | July 12, 2017 21:00 | July 13, 2017 01:00 | 4h | 64 | 228 |
| 8 | October 23, 2017 11:00 | October 23, 2017 12:30 | 1h 30m | 63 | 95 |
| 9 | May 15, 2017 13:30 | May 15, 2017 19:30 | 6h | 59 | 354 |
| 10 | July 1, 2017 23:30 | July 1, 2017 23:45 | 15m | 55 | 14 |
Outage episodes by size in 2017: 5 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 2017, 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. | 2017 | 6.3 hrs | 1.90 | 68 min | 0.58 |
| Black Hills Electric Coop, Inc | 2017 | 1.6 hrs | 0.96 | 1.6 hrs | 0.96 |
| 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 2017; 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, 2017, 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/2017/south-dakota/custer-county