County annual report · FIPS 46103
2019 Pennington County, SD Power Outage Report
In 2019, customers in Pennington County, SD went without power for an average of 2.2 hours, a total of 150K customer-hours (South Dakota average 3.8 hours). That ranks 20th worst of 58 South Dakota counties and 1966th 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 Pennington 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 | August 5, 2019 13:45 | October 9, 2019 22:00 | 65d 8h | 7,770 | 15K |
| 2 | January 24, 2019 09:30 | January 24, 2019 10:45 | 1h 15m | 5,427 | 2,284 |
| 3 | November 28, 2019 14:15 | December 3, 2019 23:00 | 5d 8h | 4,701 | 36K |
| 4 | December 12, 2019 06:00 | December 12, 2019 22:15 | 16h 15m | 3,841 | 8,549 |
| 5 | July 1, 2019 07:45 | July 1, 2019 08:00 | 15m | 2,168 | 542 |
| 6 | May 28, 2019 23:00 | May 28, 2019 23:15 | 15m | 2,045 | 511 |
| 7 | March 25, 2019 16:00 | March 25, 2019 17:15 | 1h 15m | 1,930 | 2,413 |
| 8 | March 27, 2019 22:00 | March 28, 2019 13:30 | 15h 30m | 1,585 | 25K |
| 9 | March 28, 2019 14:15 | March 28, 2019 16:30 | 2h 15m | 1,506 | 1,647 |
| 10 | April 2, 2019 19:30 | April 2, 2019 19:45 | 15m | 1,101 | 275 |
Outage episodes by size in 2019: 54 reached 100+ customers, 12 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 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 | - | - | - | - | - |
| 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 87% of South Dakota's customers in 2019; 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, 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/pennington-county