County annual report · FIPS 45029
2021 Colleton County, SC Power Outage Report
In 2021, customers in Colleton County, SC went without power for an average of 5.7 hours, a total of 116K customer-hours (South Carolina average 2.1 hours). That ranks 3rd worst of 46 South Carolina counties and 1200th 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 Colleton 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 | July 28, 2021 19:30 | July 29, 2021 00:00 | 4h 30m | 15,685 | 11K |
| 2 | July 8, 2021 05:45 | July 9, 2021 00:00 | 18h 15m | 11,142 | 32K |
| 3 | January 26, 2021 00:45 | January 26, 2021 05:00 | 4h 15m | 7,244 | 3,313 |
| 4 | May 20, 2021 22:00 | May 21, 2021 05:15 | 7h 15m | 2,761 | 1,238 |
| 5 | July 26, 2021 19:15 | July 27, 2021 03:15 | 8h | 2,682 | 2,644 |
| 6 | July 9, 2021 21:15 | July 10, 2021 07:00 | 9h 45m | 2,642 | 9,254 |
| 7 | July 26, 2021 09:45 | July 26, 2021 13:00 | 3h 15m | 2,277 | 4,818 |
| 8 | March 13, 2021 18:30 | March 13, 2021 23:00 | 4h 30m | 1,785 | 916 |
| 9 | November 16, 2021 13:00 | November 16, 2021 15:00 | 2h | 1,345 | 554 |
| 10 | May 4, 2021 20:30 | May 5, 2021 09:00 | 12h 30m | 1,033 | 4,100 |
Outage episodes by size in 2021: 65 reached 100+ customers, 10 reached 1,000+ customers, 2 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 Colleton 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 |
|---|---|---|---|---|---|
| Dominion Energy South Carolina, Inc | 2021 | 1.5 hrs | 1.10 | 79 min | 1.02 |
| Edisto Electric Coop, Inc | 2021 | 3.0 hrs | - | 3.0 hrs | - |
| Coastal Electric Coop, Inc | 2018 | 5.2 hrs | 2.73 | 3.2 hrs | 2.21 |
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 ÷ 20,355 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. Colleton County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Colleton 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/colleton-county