County annual report · FIPS 45017
2025 Calhoun County, SC Power Outage Report
In 2025, customers in Calhoun County, SC went without power for an average of 5.7 hours, a total of 52K customer-hours (South Carolina average 3.0 hours). That ranks 8th worst of 46 South Carolina counties and 1329th 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 Calhoun 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 | June 26, 2025 00:00 | June 26, 2025 10:15 | 10h 15m | 12,785 | 16K |
| 2 | August 29, 2025 04:30 | August 29, 2025 06:45 | 2h 15m | 3,220 | 3,587 |
| 3 | August 5, 2025 14:00 | August 5, 2025 21:15 | 7h 15m | 2,071 | 1,146 |
| 4 | April 12, 2025 23:15 | April 13, 2025 00:30 | 1h 15m | 1,407 | 1,057 |
| 5 | July 29, 2025 01:15 | July 29, 2025 11:15 | 10h | 1,381 | 7,733 |
| 6 | June 8, 2025 01:45 | June 8, 2025 21:30 | 19h 45m | 1,248 | 3,430 |
| 7 | June 11, 2025 17:45 | June 12, 2025 01:45 | 8h | 876 | 3,584 |
| 8 | July 4, 2025 22:30 | July 5, 2025 04:30 | 6h | 744 | 1,092 |
| 9 | August 14, 2025 13:30 | August 14, 2025 13:45 | 15m | 712 | 178 |
| 10 | June 16, 2025 17:15 | June 16, 2025 18:30 | 1h 15m | 642 | 642 |
Outage episodes by size in 2025: 31 reached 100+ customers, 6 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 Calhoun 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 |
| Aiken Electric Coop Inc | 2024 | 132.4 hrs | - | 1.6 hrs | - |
| Tri-County Electric Coop, Inc (SC) | 2024 | 17.4 hrs | 4.09 | 2.9 hrs | 2.33 |
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 ÷ 9,147 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. Calhoun County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Calhoun 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/calhoun-county