County annual report · FIPS 45019
2020 Charleston County, SC Power Outage Report
In 2020, customers in Charleston County, SC went without power for an average of 1.9 hours, a total of 446K customer-hours (South Carolina average 5.7 hours). That ranks 42nd worst of 46 South Carolina counties and 2283rd of 3,019 nationally.
Compared with SC, the US and 2019
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Charleston County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 27, 2020 10:00 | May 28, 2020 03:00 | 17h | 19,432 | 11K |
| 2 | December 25, 2020 00:45 | December 26, 2020 02:30 | 1d 1h | 7,161 | 19K |
| 3 | December 26, 2020 12:45 | December 27, 2020 05:45 | 17h | 5,378 | 73K |
| 4 | April 23, 2020 21:15 | April 24, 2020 08:45 | 11h 30m | 4,673 | 13K |
| 5 | April 6, 2020 13:30 | April 14, 2020 06:15 | 7d 16h | 4,581 | 8,217 |
| 6 | August 27, 2020 12:15 | August 27, 2020 23:30 | 11h 15m | 3,839 | 3,026 |
| 7 | April 20, 2020 10:15 | April 21, 2020 07:15 | 21h | 3,297 | 8,416 |
| 8 | December 14, 2020 07:45 | December 14, 2020 09:45 | 2h | 3,273 | 3,281 |
| 9 | October 10, 2020 01:30 | October 10, 2020 02:15 | 45m | 3,259 | 2,444 |
| 10 | May 20, 2020 10:00 | May 21, 2020 05:30 | 19h 30m | 2,836 | 7,919 |
Outage episodes by size in 2020: 185 reached 100+ customers, 48 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 2020, 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 | 2020 | 2.4 hrs | 1.40 | 88 min | 1.17 |
| Berkeley Electric Coop Inc | 2020 | 5.3 hrs | 1.69 | 1.9 hrs | 1.27 |
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 2020; 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, 2020, 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/2020/south-carolina/charleston-county