County annual report · FIPS 46103
2020 Pennington County, SD Power Outage Report
In 2020, customers in Pennington County, SD went without power for an average of 2.6 hours, a total of 175K customer-hours (South Dakota average 4.6 hours). That ranks 35th worst of 62 South Dakota counties and 2028th 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 Pennington 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 | June 20, 2020 22:45 | June 21, 2020 02:30 | 3h 45m | 5,384 | 4,412 |
| 2 | May 11, 2020 14:15 | May 19, 2020 22:00 | 8d 7h | 2,090 | 7,555 |
| 3 | August 10, 2020 20:30 | August 12, 2020 21:00 | 2d | 1,503 | 15K |
| 4 | October 7, 2020 22:15 | October 8, 2020 00:15 | 2h | 1,301 | 1,627 |
| 5 | January 7, 2020 07:45 | January 7, 2020 10:15 | 2h 30m | 1,207 | 954 |
| 6 | April 28, 2020 22:00 | May 4, 2020 12:45 | 5d 14h | 1,001 | 8,324 |
| 7 | April 25, 2020 01:00 | April 25, 2020 05:30 | 4h 30m | 983 | 891 |
| 8 | July 10, 2020 23:00 | July 13, 2020 21:30 | 2d 22h | 939 | 1,002 |
| 9 | July 23, 2020 13:30 | July 24, 2020 22:00 | 1d 8h | 903 | 2,254 |
| 10 | June 10, 2020 15:15 | June 15, 2020 23:00 | 5d 7h | 871 | 9,421 |
Outage episodes by size in 2020: 48 reached 100+ customers, 6 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 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 |
| West River Electric Assn Inc | 2020 | 28 min | 0.36 | 28 min | 0.36 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Black Hills Energy | - | - | - | - | - |
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 ÷ 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, 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/pennington-county