County annual report · FIPS 46025
2023 Clark County, SD Power Outage Report
In 2023, customers in Clark County, SD went without power for an average of 3.5 hours, a total of 5,605 customer-hours (South Dakota average 2.3 hours). That ranks 16th worst of 61 South Dakota counties and 1773rd 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 Clark 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 | February 6, 2023 17:00 | February 6, 2023 19:15 | 2h 15m | 461 | 984 |
| 2 | February 11, 2023 02:45 | February 11, 2023 06:00 | 3h 15m | 368 | 581 |
| 3 | July 13, 2023 21:00 | July 13, 2023 23:45 | 2h 45m | 323 | 430 |
| 4 | July 3, 2023 00:45 | July 3, 2023 06:00 | 5h 15m | 302 | 1,586 |
| 5 | June 27, 2023 12:00 | June 27, 2023 13:30 | 1h 30m | 138 | 173 |
| 6 | April 6, 2023 19:30 | April 6, 2023 23:15 | 3h 45m | 79 | 127 |
| 7 | May 24, 2023 14:15 | May 25, 2023 03:15 | 13h | 69 | 897 |
| 8 | May 31, 2023 13:15 | May 31, 2023 14:15 | 1h | 69 | 69 |
| 9 | June 27, 2023 23:00 | June 28, 2023 00:15 | 1h 15m | 69 | 86 |
| 10 | July 12, 2023 12:30 | July 12, 2023 14:00 | 1h 30m | 69 | 104 |
Outage episodes by size in 2023: 5 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 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 |
|---|---|---|---|---|---|
| NorthWestern Energy - (SD) | 2023 | 1.9 hrs | 1.37 | 74 min | 1.03 |
| Northern Electric Coop, Inc | 2023 | 74 min | 0.67 | 54 min | 0.55 |
| 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 2023; 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, 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/clark-county