County annual report · FIPS 45085
2018 Sumter County, SC Power Outage Report
In 2018, customers in Sumter County, SC went without power for an average of 8.2 hours, a total of 347K customer-hours (South Carolina average 5.2 hours). That ranks 11th worst of 46 South Carolina counties and 679th of 2,798 nationally.
Compared with SC, the US and 2017
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Sumter County, 2018
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 11, 2018 05:30 | October 13, 2018 08:00 | 2d 2h | 10,397 | 110K |
| 2 | June 14, 2018 22:45 | June 16, 2018 19:30 | 1d 20h | 6,415 | 14K |
| 3 | June 18, 2018 13:00 | June 18, 2018 15:00 | 2h | 5,422 | 1,367 |
| 4 | September 15, 2018 04:00 | September 18, 2018 20:30 | 3d 16h | 3,964 | 67K |
| 5 | April 15, 2018 16:15 | April 17, 2018 00:30 | 1d 8h | 3,124 | 25K |
| 6 | August 19, 2018 01:45 | August 20, 2018 13:45 | 1d 12h | 2,976 | 4,936 |
| 7 | April 24, 2018 01:45 | April 24, 2018 05:15 | 3h 30m | 2,077 | 3,116 |
| 8 | August 4, 2018 22:30 | August 6, 2018 07:30 | 1d 9h | 1,953 | 6,468 |
| 9 | August 12, 2018 20:00 | August 13, 2018 21:00 | 1d 1h | 1,317 | 7,905 |
| 10 | July 21, 2018 22:15 | July 22, 2018 00:45 | 2h 30m | 1,268 | 853 |
Outage episodes by size in 2018: 97 reached 100+ customers, 15 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 2018, 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) | 2018 | 43.0 hrs | 2.71 | 2.6 hrs | 1.33 |
| Tri-County Electric Coop, Inc (SC) | 2018 | 6.4 hrs | 3.24 | 2.9 hrs | 2.31 |
| Duke Energy | - | - | - | - | - |
| Black River Electric Coop, Inc - (SC) | - | - | - | - | - |
| 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 99% of South Carolina's customers in 2018; 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, 2018, 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/2018/south-carolina/sumter-county