County annual report · FIPS 46129
2018 Walworth County, SD Power Outage Report
In 2018, customers in Walworth County, SD went without power for an average of 1.2 hours, a total of 2,807 customer-hours (South Dakota average 1.1 hours). That ranks 6th worst of 30 South Dakota counties and 2236th of 2,798 nationally.
Compared with SD, the US and 2017
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Walworth County, 2018
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 6, 2018 02:15 | October 6, 2018 02:30 | 15m | 641 | 160 |
| 2 | April 1, 2018 20:00 | April 1, 2018 21:15 | 1h 15m | 384 | 386 |
| 3 | July 4, 2018 07:00 | July 4, 2018 14:45 | 7h 45m | 343 | 1,290 |
| 4 | May 17, 2018 23:30 | May 18, 2018 00:00 | 30m | 316 | 158 |
| 5 | March 4, 2018 17:30 | March 4, 2018 18:45 | 1h 15m | 229 | 286 |
| 6 | July 20, 2018 02:30 | July 20, 2018 04:15 | 1h 45m | 204 | 159 |
| 7 | October 8, 2018 03:30 | October 8, 2018 03:45 | 15m | 131 | 33 |
| 8 | July 4, 2018 16:00 | July 4, 2018 23:30 | 7h 30m | 31 | 119 |
| 9 | October 4, 2018 13:00 | October 4, 2018 18:15 | 5h 15m | 16 | 84 |
| 10 | April 10, 2018 15:30 | April 10, 2018 19:00 | 3h 30m | 13 | 46 |
Outage episodes by size in 2018: 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 Walworth County reported on EIA Form 861 for 2018, 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 46% of South Dakota's customers in 2018; 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, 2018, 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/2018/south-dakota/walworth-county