County annual report · FIPS 46103
2023 Pennington County, SD Power Outage Report
In 2023, customers in Pennington County, SD went without power for an average of 1.8 hours, a total of 124K customer-hours (South Dakota average 2.3 hours). That ranks 37th worst of 61 South Dakota counties and 2356th of 2,977 nationally.
Compared with SD, the US and 2022
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Pennington County, 2023
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 21, 2023 11:15 | October 21, 2023 11:45 | 30m | 2,491 | 1,246 |
| 2 | October 18, 2023 01:45 | October 19, 2023 00:30 | 22h 45m | 2,232 | 2,834 |
| 3 | August 1, 2023 00:15 | August 1, 2023 00:45 | 30m | 2,015 | 1,008 |
| 4 | June 29, 2023 00:15 | June 29, 2023 03:00 | 2h 45m | 1,917 | 5,272 |
| 5 | August 12, 2023 21:30 | September 15, 2023 16:45 | 33d 19h | 1,676 | 23K |
| 6 | December 26, 2023 17:45 | December 27, 2023 00:45 | 7h | 1,579 | 9,789 |
| 7 | December 6, 2023 15:15 | December 7, 2023 22:45 | 1d 7h | 1,446 | 2,078 |
| 8 | October 30, 2023 18:15 | October 31, 2023 14:45 | 20h 30m | 1,287 | 25K |
| 9 | October 10, 2023 15:45 | October 10, 2023 16:00 | 15m | 996 | 249 |
| 10 | April 12, 2023 15:15 | April 19, 2023 22:30 | 7d 7h | 863 | 1,845 |
Outage episodes by size in 2023: 41 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 2023, 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. | 2023 | 66 min | 0.77 | 64 min | 0.74 |
| Black Hills Electric Coop, Inc | 2023 | 2.7 hrs | 0.78 | 88 min | 0.62 |
| West River Electric Assn Inc | 2023 | 38 min | 0.46 | 38 min | 0.46 |
| 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 n/a of South Dakota's customers in 2023; 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, 2023, 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/2023/south-dakota/pennington-county