County annual report · FIPS 46103
2017 Pennington County, SD Power Outage Report
In 2017, customers in Pennington County, SD went without power for an average of 0.3 hours, a total of 21K customer-hours (South Dakota average 0.8 hours). That ranks 17th worst of 26 South Dakota counties and 2402nd 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 Pennington 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 | October 14, 2017 10:15 | October 14, 2017 11:00 | 45m | 1,661 | 1,246 |
| 2 | May 13, 2017 19:45 | May 13, 2017 21:30 | 1h 45m | 1,658 | 2,902 |
| 3 | May 14, 2017 07:15 | May 14, 2017 07:30 | 15m | 1,658 | 415 |
| 4 | March 12, 2017 19:00 | March 12, 2017 22:45 | 3h 45m | 1,606 | 1,223 |
| 5 | July 18, 2017 15:30 | July 18, 2017 16:30 | 1h | 1,485 | 1,293 |
| 6 | September 15, 2017 11:45 | September 15, 2017 12:30 | 45m | 1,389 | 1,042 |
| 7 | August 15, 2017 03:00 | August 15, 2017 03:30 | 30m | 1,249 | 625 |
| 8 | October 23, 2017 20:00 | October 23, 2017 21:30 | 1h 30m | 1,160 | 1,132 |
| 9 | October 11, 2017 20:15 | October 11, 2017 20:30 | 15m | 730 | 183 |
| 10 | October 19, 2017 17:30 | October 19, 2017 18:00 | 30m | 721 | 361 |
Outage episodes by size in 2017: 24 reached 100+ customers, 8 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 Pennington 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 | - | - | - | - | - |
| Black Hills Energy | - | - | - | - | - |
| West River Electric Assn Inc | - | - | - | - | - |
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 ÷ 68,130 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. Pennington County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Pennington 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/pennington-county