County annual report · FIPS 46137
2025 Ziebach County, SD Power Outage Report
In 2025, customers in Ziebach County, SD went without power for an average of 25.2 hours, a total of 35K customer-hours (South Dakota average 6.5 hours). That ranks 4th worst of 65 South Dakota counties and 243rd of 3,000 nationally.
Compared with SD, the US and 2024
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Ziebach County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 14, 2025 15:15 | November 14, 2025 16:45 | 1h 30m | 1,571 | 2,357 |
| 2 | September 3, 2025 12:15 | September 3, 2025 15:15 | 3h | 1,569 | 4,502 |
| 3 | November 25, 2025 15:30 | November 25, 2025 21:15 | 5h 45m | 1,566 | 898 |
| 4 | August 13, 2025 11:30 | August 13, 2025 16:45 | 5h 15m | 1,106 | 5,601 |
| 5 | November 12, 2025 21:45 | November 13, 2025 23:45 | 1d 2h | 896 | 16K |
| 6 | July 14, 2025 23:30 | July 15, 2025 14:00 | 14h 30m | 465 | 131 |
| 7 | October 29, 2025 12:15 | October 29, 2025 14:15 | 2h | 465 | 930 |
| 8 | November 8, 2025 15:30 | November 8, 2025 19:00 | 3h 30m | 256 | 832 |
| 9 | December 18, 2025 11:15 | December 18, 2025 20:00 | 8h 45m | 255 | 480 |
| 10 | July 27, 2025 22:30 | July 27, 2025 23:15 | 45m | 77 | 27 |
Outage episodes by size in 2025: 9 reached 100+ customers, 4 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 Ziebach County reported on EIA Form 861 for 2025, 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 |
|---|---|---|---|---|---|
| West River Electric Assn Inc | 2024 | 44 min | 0.53 | 44 min | 0.53 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Grand Electric Coop, Inc | - | - | - | - | - |
| 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 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,374 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. Ziebach County has data for 2018–2025.
Cite this report
MassOutage (massoutage.com), Ziebach County, SD annual power outage report, 2025, 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/2025/south-dakota/ziebach-county