County annual report · FIPS 46085
2023 Lyman County, SD Power Outage Report
In 2023, customers in Lyman County, SD went without power for an average of 2.2 hours, a total of 6,478 customer-hours (South Dakota average 2.3 hours). That ranks 31st worst of 61 South Dakota counties and 2221st of 2,977 nationally.
Compared with SD, the US and 2022
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Lyman County, 2023
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 6, 2023 07:45 | July 6, 2023 17:30 | 9h 45m | 1,281 | 1,035 |
| 2 | July 19, 2023 01:15 | August 25, 2023 13:15 | 37d 12h | 430 | 3,004 |
| 3 | April 15, 2023 15:15 | April 15, 2023 17:15 | 2h | 196 | 392 |
| 4 | November 14, 2023 01:45 | November 14, 2023 06:45 | 5h | 180 | 232 |
| 5 | September 7, 2023 18:45 | September 7, 2023 20:00 | 1h 15m | 169 | 78 |
| 6 | May 4, 2023 20:30 | May 4, 2023 21:15 | 45m | 125 | 63 |
| 7 | May 1, 2023 19:00 | May 1, 2023 20:00 | 1h | 116 | 87 |
| 8 | June 24, 2023 06:45 | June 24, 2023 09:15 | 2h 30m | 115 | 118 |
| 9 | January 14, 2023 18:15 | January 14, 2023 21:15 | 3h | 68 | 40 |
| 10 | August 31, 2023 17:15 | August 31, 2023 19:30 | 2h 15m | 64 | 144 |
Outage episodes by size in 2023: 8 reached 100+ customers, 1 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 2023, 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 n/a of South Dakota's customers in 2023; 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, 2023, 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/2023/south-dakota/lyman-county