County annual report · FIPS 46085
2024 Lyman County, SD Power Outage Report
In 2024, customers in Lyman County, SD went without power for an average of 1.5 hours, a total of 4,337 customer-hours (South Dakota average 2.3 hours). That ranks 35th worst of 65 South Dakota counties and 2576th 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 Lyman 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 30, 2024 01:00 | August 2, 2024 18:00 | 3d 17h | 471 | 496 |
| 2 | July 14, 2024 07:30 | July 15, 2024 17:30 | 1d 10h | 326 | 1,113 |
| 3 | August 20, 2024 15:30 | August 20, 2024 22:15 | 6h 45m | 220 | 223 |
| 4 | May 19, 2024 10:45 | May 19, 2024 13:15 | 2h 30m | 173 | 348 |
| 5 | August 14, 2024 03:30 | August 14, 2024 05:15 | 1h 45m | 173 | 115 |
| 6 | April 12, 2024 08:00 | April 12, 2024 10:00 | 2h | 127 | 254 |
| 7 | October 25, 2024 05:30 | October 25, 2024 07:00 | 1h 30m | 111 | 167 |
| 8 | November 20, 2024 16:30 | November 20, 2024 18:00 | 1h 30m | 81 | 82 |
| 9 | July 18, 2024 19:45 | July 22, 2024 18:00 | 3d 22h | 63 | 129 |
| 10 | November 15, 2024 18:30 | November 15, 2024 20:30 | 2h | 60 | 75 |
Outage episodes by size in 2024: 7 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 Lyman 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 |
|---|---|---|---|---|---|
| West Central Electric Coop Inc - (SD) | 2018 | 3.7 hrs | 1.25 | 1.5 hrs | 1.25 |
| Rosebud Electric Coop Inc | 2024 | 1.9 hrs | 0.84 | 1.6 hrs | 0.76 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
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 ÷ 2,969 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. Lyman County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Lyman 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/lyman-county