County annual report · FIPS 46129
2023 Walworth County, SD Power Outage Report
In 2023, customers in Walworth County, SD went without power for an average of 1.1 hours, a total of 2,529 customer-hours (South Dakota average 2.3 hours). That ranks 47th worst of 61 South Dakota counties and 2656th 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 Walworth 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 | May 31, 2023 11:00 | May 31, 2023 13:15 | 2h 15m | 771 | 1,611 |
| 2 | March 9, 2023 20:30 | March 9, 2023 21:00 | 30m | 309 | 154 |
| 3 | November 2, 2023 23:00 | November 2, 2023 23:45 | 45m | 225 | 169 |
| 4 | December 26, 2023 16:00 | December 26, 2023 20:45 | 4h 45m | 91 | 238 |
| 5 | May 4, 2023 01:15 | May 4, 2023 01:30 | 15m | 61 | 15 |
| 6 | August 19, 2023 06:15 | August 19, 2023 06:30 | 15m | 39 | 10 |
| 7 | July 3, 2023 05:00 | July 3, 2023 05:30 | 30m | 36 | 18 |
| 8 | June 1, 2023 11:00 | June 1, 2023 13:15 | 2h 15m | 29 | 63 |
| 9 | May 26, 2023 12:00 | May 26, 2023 12:30 | 30m | 21 | 7 |
| 10 | May 3, 2023 23:45 | May 4, 2023 00:00 | 15m | 16 | 4 |
Outage episodes by size in 2023: 3 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 Walworth 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 |
|---|---|---|---|---|---|
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| Cam Wal 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 ÷ 2,370 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. Walworth County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Walworth 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/). https://massoutage.com/reports/2023/south-dakota/walworth-county