County annual report · FIPS 46085
2019 Lyman County, SD Power Outage Report
In 2019, customers in Lyman County, SD went without power for an average of 2.2 hours, a total of 6,504 customer-hours (South Dakota average 3.8 hours). That ranks 21st worst of 58 South Dakota counties and 1968th of 2,945 nationally.
Compared with SD, the US
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Lyman County, 2019
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 28, 2019 13:00 | July 28, 2019 15:30 | 2h 30m | 521 | 1,058 |
| 2 | August 28, 2019 19:00 | August 28, 2019 19:30 | 30m | 256 | 74 |
| 3 | July 20, 2019 11:45 | July 20, 2019 17:15 | 5h 30m | 65 | 222 |
| 4 | August 21, 2019 18:45 | August 21, 2019 19:30 | 45m | 52 | 39 |
| 5 | July 10, 2019 18:30 | July 19, 2019 16:15 | 8d 21h | 43 | 548 |
| 6 | December 12, 2019 19:00 | December 12, 2019 22:00 | 3h | 43 | 55 |
| 7 | October 12, 2019 22:00 | October 14, 2019 14:45 | 1d 16h | 41 | 169 |
| 8 | August 10, 2019 00:00 | August 10, 2019 19:30 | 19h 30m | 34 | 56 |
| 9 | August 18, 2019 00:45 | August 18, 2019 05:45 | 5h | 32 | 94 |
| 10 | July 1, 2019 01:15 | July 1, 2019 15:45 | 14h 30m | 31 | 262 |
Outage episodes by size in 2019: 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 Lyman County reported on EIA Form 861 for 2019, 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 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Rosebud 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 87% of South Dakota's customers in 2019; 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, 2019, 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/2019/south-dakota/lyman-county