County annual report · FIPS 45085
2023 Sumter County, SC Power Outage Report
In 2023, customers in Sumter County, SC went without power for an average of 3.2 hours, a total of 135K customer-hours (South Carolina average 2.7 hours). That ranks 24th worst of 46 South Carolina counties and 1899th of 2,977 nationally.
Compared with SC, the US and 2022
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Sumter County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 7, 2023 13:00 | November 8, 2023 02:15 | 13h 15m | 4,387 | 8,347 |
| 2 | June 7, 2023 02:30 | June 7, 2023 23:15 | 20h 45m | 4,254 | 8,775 |
| 3 | August 10, 2023 12:00 | August 11, 2023 02:45 | 14h 45m | 4,111 | 7,010 |
| 4 | August 30, 2023 17:15 | September 1, 2023 01:15 | 1d 8h | 2,856 | 17K |
| 5 | January 4, 2023 12:45 | January 4, 2023 21:00 | 8h 15m | 1,882 | 1,081 |
| 6 | August 15, 2023 14:45 | August 16, 2023 11:15 | 20h 30m | 1,606 | 5,126 |
| 7 | September 9, 2023 22:15 | September 10, 2023 04:45 | 6h 30m | 1,531 | 2,829 |
| 8 | July 6, 2023 11:30 | July 7, 2023 00:00 | 12h 30m | 1,528 | 3,107 |
| 9 | June 11, 2023 17:30 | June 12, 2023 14:15 | 20h 45m | 1,523 | 2,832 |
| 10 | June 19, 2023 14:15 | June 19, 2023 22:30 | 8h 15m | 1,398 | 1,634 |
Outage episodes by size in 2023: 71 reached 100+ customers, 15 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 Sumter County reported on EIA Form 861 for 2023, 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 Progress - (NC) | 2023 | 3.7 hrs | 1.47 | 2.4 hrs | 1.22 |
| Tri-County Electric Coop, Inc (SC) | 2023 | 7.1 hrs | 3.75 | 3.3 hrs | 2.43 |
| Black River Electric Coop, Inc - (SC) | 2023 | 2.1 hrs | 1.18 | 1.9 hrs | 1.13 |
| Duke Energy | - | - | - | - | - |
| City of Camden | - | - | - | - | - |
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 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 42,515 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. Sumter County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sumter County, SC annual power outage report, 2023, 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/2023/south-carolina/sumter-county