County annual report · FIPS 45019
2017 Charleston County, SC Power Outage Report
In 2017, customers in Charleston County, SC went without power for an average of 5.7 hours, a total of 1.3M customer-hours (South Carolina average 4.4 hours). That ranks 16th worst of 46 South Carolina counties and 882nd of 2,786 nationally.
Compared with SC, the US and 2016
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Charleston County, 2017
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 11, 2017 06:30 | September 15, 2017 05:45 | 3d 23h | 62,562 | 1.0M |
| 2 | March 22, 2017 05:00 | March 22, 2017 15:00 | 10h | 19,112 | 12K |
| 3 | December 17, 2017 00:45 | December 18, 2017 21:00 | 1d 20h | 15,842 | 11K |
| 4 | August 24, 2017 19:00 | August 25, 2017 10:00 | 15h | 3,587 | 12K |
| 5 | June 23, 2017 07:00 | June 23, 2017 09:45 | 2h 45m | 3,519 | 9,670 |
| 6 | March 15, 2017 18:30 | March 20, 2017 19:30 | 5d 1h | 3,195 | 2,929 |
| 7 | April 26, 2017 12:30 | April 27, 2017 17:00 | 1d 4h | 3,079 | 2,626 |
| 8 | July 19, 2017 16:45 | July 20, 2017 16:45 | 1d | 3,072 | 10K |
| 9 | May 23, 2017 12:00 | May 24, 2017 03:30 | 15h 30m | 2,788 | 3,952 |
| 10 | February 8, 2017 16:00 | February 8, 2017 21:15 | 5h 15m | 2,577 | 666 |
Outage episodes by size in 2017: 184 reached 100+ customers, 41 reached 1,000+ customers, 3 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 2017, 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 | 2017 | 5.5 hrs | 1.85 | 82 min | 1.14 |
| Berkeley Electric Coop Inc | 2017 | 9.0 hrs | 2.38 | 2.3 hrs | 1.79 |
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 2017; 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, 2017, 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/2017/south-carolina/charleston-county