County annual report · FIPS 45019
2018 Charleston County, SC Power Outage Report
In 2018, customers in Charleston County, SC went without power for an average of 2.1 hours, a total of 497K customer-hours (South Carolina average 5.2 hours). That ranks 37th worst of 46 South Carolina counties and 1804th of 2,798 nationally.
Compared with SC, the US and 2017
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Charleston 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 10, 2018 01:30 | October 13, 2018 04:30 | 3d 3h | 11,577 | 87K |
| 2 | July 7, 2018 15:30 | July 8, 2018 08:45 | 17h 15m | 6,557 | 16K |
| 3 | February 27, 2018 06:15 | February 27, 2018 10:00 | 3h 45m | 5,598 | 1,435 |
| 4 | June 25, 2018 00:00 | June 26, 2018 06:30 | 1d 6h | 5,576 | 18K |
| 5 | January 3, 2018 11:15 | January 5, 2018 06:30 | 1d 19h | 5,343 | 34K |
| 6 | September 21, 2018 18:45 | September 22, 2018 19:15 | 1d | 3,532 | 12K |
| 7 | March 25, 2018 21:45 | March 26, 2018 05:30 | 7h 45m | 3,488 | 2,044 |
| 8 | September 12, 2018 12:15 | September 13, 2018 02:15 | 14h | 3,421 | 2,527 |
| 9 | July 18, 2018 11:45 | July 18, 2018 23:15 | 11h 30m | 3,258 | 8,807 |
| 10 | February 4, 2018 12:30 | February 5, 2018 01:15 | 12h 45m | 2,917 | 4,760 |
Outage episodes by size in 2018: 244 reached 100+ customers, 62 reached 1,000+ customers, 1 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 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 |
|---|---|---|---|---|---|
| Dominion Energy South Carolina, Inc | 2018 | 2.8 hrs | 1.80 | 1.6 hrs | 1.37 |
| Berkeley Electric Coop Inc | 2018 | 2.9 hrs | 1.76 | 2.2 hrs | 1.55 |
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 2018; 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, 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/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2018/south-carolina/charleston-county