County annual report · FIPS 46025
2024 Clark County, SD Power Outage Report
In 2024, customers in Clark County, SD went without power for an average of 1.0 hours, a total of 1,637 customer-hours (South Dakota average 2.3 hours). That ranks 46th worst of 65 South Dakota counties and 2718th of 2,990 nationally.
Compared with SD, the US and 2023
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Clark County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 31, 2024 16:30 | July 31, 2024 17:00 | 30m | 317 | 140 |
| 2 | July 13, 2024 12:30 | July 13, 2024 13:30 | 1h | 211 | 211 |
| 3 | August 26, 2024 04:30 | August 26, 2024 08:15 | 3h 45m | 69 | 259 |
| 4 | August 27, 2024 15:15 | August 27, 2024 19:45 | 4h 30m | 69 | 260 |
| 5 | October 5, 2024 12:30 | October 5, 2024 18:15 | 5h 45m | 60 | 205 |
| 6 | June 22, 2024 16:30 | June 22, 2024 18:15 | 1h 45m | 53 | 80 |
| 7 | September 4, 2024 19:30 | September 4, 2024 20:00 | 30m | 51 | 26 |
| 8 | December 25, 2024 15:45 | December 25, 2024 17:45 | 2h | 51 | 102 |
| 9 | January 24, 2024 17:45 | January 24, 2024 20:30 | 2h 45m | 25 | 54 |
| 10 | December 26, 2024 01:00 | December 26, 2024 03:15 | 2h 15m | 15 | 34 |
Outage episodes by size in 2024: 2 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 Clark County reported on EIA Form 861 for 2024, 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 |
|---|---|---|---|---|---|
| NorthWestern Energy - (SD) | 2024 | 76 min | 0.70 | 66 min | 0.65 |
| Northern Electric Coop, Inc | 2024 | 50 min | 0.67 | 50 min | 0.67 |
| H-D Electric Coop Inc | 2018 | 2.6 hrs | 1.52 | 1.6 hrs | 1.14 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Codington-Clark Elec Coop, Inc | - | - | - | - | - |
| Kingsbury Electric Coop, 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 2024; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,587 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. Clark County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Clark County, SD annual power outage report, 2024, 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/2024/south-dakota/clark-county