County annual report · FIPS 45087
2025 Union County, SC Power Outage Report
In 2025, customers in Union County, SC went without power for an average of 1.8 hours, a total of 40K customer-hours (South Carolina average 3.0 hours). That ranks 40th worst of 46 South Carolina counties and 2488th 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 Union 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 | October 4, 2025 12:30 | October 4, 2025 14:45 | 2h 15m | 1,822 | 2,282 |
| 2 | August 30, 2025 01:15 | August 30, 2025 12:30 | 11h 15m | 1,820 | 20K |
| 3 | August 5, 2025 04:00 | August 5, 2025 09:45 | 5h 45m | 1,669 | 2,276 |
| 4 | April 12, 2025 21:45 | April 12, 2025 23:30 | 1h 45m | 1,164 | 1,179 |
| 5 | August 1, 2025 23:00 | August 2, 2025 01:30 | 2h 30m | 1,114 | 2,023 |
| 6 | July 1, 2025 20:15 | July 1, 2025 20:45 | 30m | 771 | 203 |
| 7 | May 22, 2025 22:30 | May 23, 2025 02:00 | 3h 30m | 528 | 933 |
| 8 | May 4, 2025 03:45 | May 4, 2025 10:15 | 6h 30m | 503 | 1,937 |
| 9 | May 2, 2025 08:00 | May 2, 2025 10:45 | 2h 45m | 482 | 879 |
| 10 | March 31, 2025 20:30 | March 31, 2025 23:45 | 3h 15m | 407 | 523 |
Outage episodes by size in 2025: 24 reached 100+ customers, 5 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 Union 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 |
|---|---|---|---|---|---|
| Duke Energy Carolinas, LLC | 2024 | 78.6 hrs | 2.50 | 2.9 hrs | 1.26 |
| Dominion Energy South Carolina, Inc | 2024 | 31.8 hrs | 2.52 | 81 min | 1.19 |
| Laurens Electric Coop, Inc | 2024 | 138.5 hrs | 2.84 | 1.6 hrs | 1.14 |
| Broad River Electric Coop, Inc | - | - | - | - | - |
| Lockhart Power Co | - | - | - | - | - |
| City of Union - (SC) | - | - | - | - | - |
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 ÷ 21,940 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. Union County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Union 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/union-county