County annual report · FIPS 45019
2025 Charleston County, SC Power Outage Report
In 2025, customers in Charleston County, SC went without power for an average of 2.3 hours, a total of 520K customer-hours (South Carolina average 3.0 hours). That ranks 38th worst of 46 South Carolina counties and 2329th of 3,000 nationally.
Compared with SC, the US and 2024
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Charleston County, 2025
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 15, 2025 10:15 | September 15, 2025 10:45 | 30m | 6,830 | 1,933 |
| 2 | March 24, 2025 19:45 | March 25, 2025 21:00 | 1d 1h | 6,538 | 2,700 |
| 3 | April 7, 2025 12:15 | April 8, 2025 08:15 | 20h | 6,294 | 12K |
| 4 | August 28, 2025 09:30 | August 29, 2025 01:15 | 15h 45m | 4,837 | 4,043 |
| 5 | June 23, 2025 13:30 | June 26, 2025 15:30 | 3d 2h | 4,601 | 25K |
| 6 | June 11, 2025 09:00 | June 12, 2025 03:45 | 18h 45m | 4,553 | 11K |
| 7 | October 25, 2025 05:45 | October 25, 2025 16:15 | 10h 30m | 4,528 | 20K |
| 8 | May 11, 2025 07:00 | May 11, 2025 22:30 | 15h 30m | 4,077 | 12K |
| 9 | May 2, 2025 12:30 | May 3, 2025 02:15 | 13h 45m | 4,012 | 1,241 |
| 10 | October 6, 2025 12:30 | October 7, 2025 22:00 | 1d 9h | 3,998 | 5,252 |
Outage episodes by size in 2025: 253 reached 100+ customers, 95 reached 1,000+ customers, 0 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 2025, 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 | 2024 | 31.8 hrs | 2.52 | 81 min | 1.19 |
| Berkeley Electric Coop Inc | 2024 | 4.9 hrs | 1.59 | 89 min | 0.94 |
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 2025; 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, 2025, 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/2025/south-carolina/charleston-county