County annual report · FIPS 46085
2020 Lyman County, SD Power Outage Report
In 2020, customers in Lyman County, SD went without power for an average of 22.9 hours, a total of 68K customer-hours (South Dakota average 4.6 hours). That ranks 3rd worst of 62 South Dakota counties and 377th of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Lyman County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 5, 2020 15:15 | October 20, 2020 15:15 | 15d | 628 | 2,926 |
| 2 | December 23, 2020 15:30 | December 29, 2020 21:30 | 6d 6h | 398 | 58K |
| 3 | June 18, 2020 02:30 | June 18, 2020 14:00 | 11h 30m | 195 | 1,768 |
| 4 | May 15, 2020 01:15 | May 15, 2020 04:00 | 2h 45m | 173 | 137 |
| 5 | March 5, 2020 03:45 | March 5, 2020 05:00 | 1h 15m | 167 | 70 |
| 6 | December 2, 2020 16:15 | December 2, 2020 16:30 | 15m | 158 | 40 |
| 7 | January 2, 2020 21:00 | January 2, 2020 21:45 | 45m | 154 | 116 |
| 8 | July 25, 2020 00:00 | July 25, 2020 03:00 | 3h | 131 | 118 |
| 9 | April 11, 2020 16:45 | April 11, 2020 19:15 | 2h 30m | 130 | 89 |
| 10 | May 1, 2020 16:00 | May 1, 2020 16:45 | 45m | 98 | 74 |
Outage episodes by size in 2020: 9 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 2020, 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 79% of South Dakota's customers in 2020; 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, 2020, 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/2020/south-dakota/lyman-county