County annual report · FIPS 45085
2021 Sumter County, SC Power Outage Report
In 2021, customers in Sumter County, SC went without power for an average of 5.0 hours, a total of 213K customer-hours (South Carolina average 2.1 hours). That ranks 4th worst of 46 South Carolina counties and 1323rd 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 Sumter 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 | April 8, 2021 08:45 | April 8, 2021 18:45 | 10h | 15,457 | 48K |
| 2 | February 28, 2021 09:15 | February 28, 2021 18:45 | 9h 30m | 4,932 | 30K |
| 3 | October 26, 2021 12:15 | October 26, 2021 15:00 | 2h 45m | 4,010 | 1,009 |
| 4 | August 16, 2021 17:30 | August 17, 2021 04:30 | 11h | 2,985 | 3,757 |
| 5 | March 28, 2021 17:00 | March 29, 2021 21:30 | 1d 4h | 2,944 | 11K |
| 6 | May 12, 2021 08:45 | May 13, 2021 00:00 | 15h 15m | 2,757 | 6,485 |
| 7 | July 31, 2021 21:00 | August 1, 2021 08:15 | 11h 15m | 2,607 | 5,449 |
| 8 | July 27, 2021 16:15 | July 28, 2021 04:30 | 12h 15m | 2,156 | 8,105 |
| 9 | January 10, 2021 18:30 | January 11, 2021 01:15 | 6h 45m | 2,101 | 3,386 |
| 10 | July 12, 2021 12:30 | July 13, 2021 02:15 | 13h 45m | 1,955 | 2,817 |
Outage episodes by size in 2021: 88 reached 100+ customers, 22 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 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 Progress - (NC) | 2021 | 3.1 hrs | 1.39 | 2.4 hrs | 1.34 |
| Tri-County Electric Coop, Inc (SC) | 2021 | 4.1 hrs | 2.61 | 3.4 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 2021; 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, 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/sumter-county