County annual report · FIPS 45089
2021 Williamsburg County, SC Power Outage Report
In 2021, customers in Williamsburg County, SC went without power for an average of 2.3 hours, a total of 48K customer-hours (South Carolina average 2.1 hours). That ranks 23rd worst of 46 South Carolina counties and 2133rd of 2,974 nationally.
Compared with SC, the US and 2020
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Williamsburg County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 1, 2021 16:15 | March 2, 2021 00:45 | 8h 30m | 2,732 | 1,877 |
| 2 | July 2, 2021 14:15 | July 2, 2021 16:45 | 2h 30m | 2,475 | 2,003 |
| 3 | July 28, 2021 21:00 | July 28, 2021 23:15 | 2h 15m | 2,273 | 2,083 |
| 4 | June 25, 2021 22:30 | June 26, 2021 01:15 | 2h 45m | 1,602 | 1,874 |
| 5 | July 29, 2021 22:45 | July 30, 2021 01:00 | 2h 15m | 1,541 | 3,074 |
| 6 | July 18, 2021 20:00 | July 19, 2021 05:30 | 9h 30m | 1,026 | 3,598 |
| 7 | March 28, 2021 21:15 | March 29, 2021 05:30 | 8h 15m | 998 | 2,445 |
| 8 | July 15, 2021 15:30 | July 15, 2021 16:30 | 1h | 907 | 464 |
| 9 | July 8, 2021 05:45 | July 8, 2021 22:15 | 16h 30m | 867 | 1,359 |
| 10 | June 17, 2021 22:00 | June 18, 2021 00:45 | 2h 45m | 733 | 2,016 |
Outage episodes by size in 2021: 60 reached 100+ customers, 6 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 2021, 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) | 2021 | 3.1 hrs | 1.39 | 2.4 hrs | 1.34 |
| Santee Electric Coop, Inc | 2021 | 2.3 hrs | - | 2.2 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 99% of South Carolina's customers in 2021; 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, 2021, 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/2021/south-carolina/williamsburg-county