County annual report · FIPS 45089
2025 Williamsburg County, SC Power Outage Report
In 2025, customers in Williamsburg County, SC went without power for an average of 3.5 hours, a total of 76K customer-hours (South Carolina average 3.0 hours). That ranks 20th worst of 46 South Carolina counties and 1896th of 3,000 nationally.
Compared with SC, the US and 2024
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Williamsburg County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 19, 2025 17:00 | November 19, 2025 18:30 | 1h 30m | 5,067 | 2,504 |
| 2 | June 25, 2025 23:00 | June 26, 2025 09:00 | 10h | 3,851 | 11K |
| 3 | April 24, 2025 17:45 | April 24, 2025 19:00 | 1h 15m | 2,487 | 1,021 |
| 4 | April 20, 2025 17:00 | April 20, 2025 19:00 | 2h | 1,814 | 1,857 |
| 5 | June 8, 2025 03:00 | June 8, 2025 14:15 | 11h 15m | 1,614 | 2,440 |
| 6 | October 9, 2025 08:30 | October 9, 2025 09:45 | 1h 15m | 1,377 | 1,259 |
| 7 | March 17, 2025 03:30 | March 17, 2025 08:15 | 4h 45m | 1,372 | 3,740 |
| 8 | July 5, 2025 18:15 | July 6, 2025 02:30 | 8h 15m | 1,228 | 1,535 |
| 9 | February 13, 2025 18:00 | February 13, 2025 18:45 | 45m | 1,157 | 868 |
| 10 | May 31, 2025 08:45 | May 31, 2025 16:45 | 8h | 819 | 5,504 |
Outage episodes by size in 2025: 73 reached 100+ customers, 9 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 Williamsburg County reported on EIA Form 861 for 2025, 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 |
|---|---|---|---|---|---|
| Duke Energy Progress - (NC) | 2024 | 17.2 hrs | 1.70 | 2.2 hrs | 1.22 |
| Santee Electric Coop, Inc | 2024 | 7.4 hrs | - | 2.5 hrs | - |
| Duke Energy | - | - | - | - | - |
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 Carolina's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 21,455 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. Williamsburg County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Williamsburg County, SC annual power outage report, 2025, 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/2025/south-carolina/williamsburg-county