County annual report · FIPS 45087
2021 Union County, SC Power Outage Report
In 2021, customers in Union County, SC went without power for an average of 1.2 hours, a total of 27K customer-hours (South Carolina average 2.1 hours). That ranks 39th worst of 46 South Carolina counties and 2579th of 2,974 nationally.
Compared with SC, the US and 2020
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Union County, 2021
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 21, 2021 14:15 | September 23, 2021 16:30 | 2d 2h | 626 | 16K |
| 2 | March 25, 2021 21:30 | March 26, 2021 04:30 | 7h | 374 | 712 |
| 3 | July 27, 2021 23:45 | July 28, 2021 01:00 | 1h 15m | 352 | 256 |
| 4 | July 27, 2021 03:30 | July 27, 2021 09:30 | 6h | 330 | 1,718 |
| 5 | April 17, 2021 19:15 | April 17, 2021 20:15 | 1h | 328 | 291 |
| 6 | November 8, 2021 17:00 | December 31, 2021 00:15 | 52d 7h | 316 | 4,857 |
| 7 | August 14, 2021 18:45 | August 15, 2021 00:45 | 6h | 228 | 153 |
| 8 | January 11, 2021 19:15 | January 11, 2021 21:45 | 2h 30m | 114 | 61 |
| 9 | August 31, 2021 20:45 | August 31, 2021 22:45 | 2h | 103 | 202 |
| 10 | March 1, 2021 13:15 | March 1, 2021 17:00 | 3h 45m | 74 | 241 |
Outage episodes by size in 2021: 9 reached 100+ customers, 0 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 2021, 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 | 2021 | 3.5 hrs | 1.20 | 2.5 hrs | 1.10 |
| Dominion Energy South Carolina, Inc | 2021 | 1.5 hrs | 1.10 | 79 min | 1.02 |
| Laurens Electric Coop, Inc | 2021 | 84 min | 0.92 | 84 min | 0.92 |
| 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 99% of South Carolina's customers in 2021; 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, 2021, 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/2021/south-carolina/union-county