County annual report · FIPS 45085
2025 Sumter County, SC Power Outage Report
In 2025, customers in Sumter County, SC went without power for an average of 2.5 hours, a total of 106K customer-hours (South Carolina average 3.0 hours). That ranks 34th worst of 46 South Carolina counties and 2232nd 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 Sumter 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 20, 2025 18:30 | June 20, 2025 18:45 | 15m | 22,428 | 5,607 |
| 2 | June 7, 2025 22:00 | June 8, 2025 23:45 | 1d 1h | 2,076 | 4,797 |
| 3 | June 25, 2025 19:45 | June 26, 2025 09:00 | 13h 15m | 1,963 | 5,959 |
| 4 | October 30, 2025 20:15 | October 30, 2025 21:30 | 1h 15m | 1,956 | 2,445 |
| 5 | September 14, 2025 08:00 | September 14, 2025 11:15 | 3h 15m | 1,936 | 3,526 |
| 6 | April 9, 2025 10:45 | April 10, 2025 01:15 | 14h 30m | 1,670 | 915 |
| 7 | July 31, 2025 22:45 | August 1, 2025 16:15 | 17h 30m | 1,669 | 5,864 |
| 8 | June 13, 2025 23:00 | June 15, 2025 00:45 | 1d 1h | 1,474 | 3,121 |
| 9 | July 18, 2025 18:15 | July 19, 2025 01:45 | 7h 30m | 1,387 | 2,600 |
| 10 | July 23, 2025 20:45 | July 24, 2025 03:15 | 6h 30m | 1,273 | 2,559 |
Outage episodes by size in 2025: 89 reached 100+ customers, 17 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 Sumter 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 Progress - (NC) | 2024 | 17.2 hrs | 1.70 | 2.2 hrs | 1.22 |
| Tri-County Electric Coop, Inc (SC) | 2024 | 17.4 hrs | 4.09 | 2.9 hrs | 2.33 |
| Black River Electric Coop, Inc - (SC) | 2024 | 3.8 hrs | 2.00 | 1.6 hrs | 1.35 |
| 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 2025; 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, 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/sumter-county