County annual report · FIPS 46041
2024 Dewey County, SD Power Outage Report
In 2024, customers in Dewey County, SD went without power for an average of 1.0 hours, a total of 4,880 customer-hours (South Dakota average 2.3 hours). That ranks 49th worst of 65 South Dakota counties and 2725th of 2,990 nationally.
Compared with SD, the US
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Dewey 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 | August 22, 2024 03:45 | August 22, 2024 07:15 | 3h 30m | 371 | 681 |
| 2 | June 23, 2024 00:15 | June 23, 2024 03:45 | 3h 30m | 288 | 521 |
| 3 | December 25, 2024 17:45 | December 26, 2024 02:15 | 8h 30m | 251 | 482 |
| 4 | December 4, 2024 16:15 | December 4, 2024 17:15 | 1h | 243 | 243 |
| 5 | July 14, 2024 06:30 | July 14, 2024 18:00 | 11h 30m | 209 | 1,174 |
| 6 | September 18, 2024 02:30 | September 18, 2024 05:00 | 2h 30m | 156 | 314 |
| 7 | June 28, 2024 03:00 | June 28, 2024 05:30 | 2h 30m | 137 | 39 |
| 8 | August 20, 2024 08:45 | August 20, 2024 11:45 | 3h | 118 | 95 |
| 9 | November 28, 2024 21:45 | November 29, 2024 01:45 | 4h | 98 | 392 |
| 10 | August 20, 2024 02:00 | August 20, 2024 03:15 | 1h 15m | 95 | 72 |
Outage episodes by size in 2024: 8 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 Dewey 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 |
|---|---|---|---|---|---|
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Moreau-Grand 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 ÷ 4,866 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. Dewey County has data for 2024–2025.
Cite this report
MassOutage (massoutage.com), Dewey 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/). https://massoutage.com/reports/2024/south-dakota/dewey-county