County annual report · FIPS 45019
2023 Charleston County, SC Power Outage Report
In 2023, customers in Charleston County, SC went without power for an average of 1.8 hours, a total of 426K customer-hours (South Carolina average 2.7 hours). That ranks 37th worst of 46 South Carolina counties and 2349th of 2,977 nationally.
Compared with SC, the US and 2022
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Charleston 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 | August 30, 2023 09:45 | September 1, 2023 02:00 | 1d 16h | 19,706 | 54K |
| 2 | February 22, 2023 12:00 | February 22, 2023 21:45 | 9h 45m | 11,230 | 3,305 |
| 3 | October 25, 2023 10:45 | October 26, 2023 02:30 | 15h 45m | 7,167 | 6,367 |
| 4 | April 16, 2023 11:00 | April 16, 2023 17:00 | 6h | 6,143 | 11K |
| 5 | December 9, 2023 13:15 | December 12, 2023 07:00 | 2d 17h | 5,664 | 13K |
| 6 | November 4, 2023 11:45 | November 5, 2023 01:15 | 13h 30m | 4,733 | 2,486 |
| 7 | July 4, 2023 19:15 | July 7, 2023 04:00 | 2d 8h | 4,271 | 8,919 |
| 8 | June 25, 2023 10:30 | June 25, 2023 17:30 | 7h | 3,624 | 5,794 |
| 9 | May 26, 2023 19:30 | May 28, 2023 03:45 | 1d 8h | 3,441 | 13K |
| 10 | May 8, 2023 08:45 | May 11, 2023 04:45 | 2d 20h | 3,422 | 13K |
Outage episodes by size in 2023: 214 reached 100+ customers, 56 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 Charleston 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 |
|---|---|---|---|---|---|
| Dominion Energy South Carolina, Inc | 2023 | 2.0 hrs | 1.48 | 90 min | 1.32 |
| Berkeley Electric Coop Inc | 2023 | 1.8 hrs | 1.19 | 1.6 hrs | 1.10 |
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 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 231,046 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. Charleston County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Charleston County, SC 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/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2023/south-carolina/charleston-county