County annual report · FIPS 45023
2021 Chester County, SC Power Outage Report
In 2021, customers in Chester County, SC went without power for an average of 2.8 hours, a total of 58K customer-hours (South Carolina average 2.1 hours). That ranks 16th worst of 46 South Carolina counties and 1916th 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 Chester 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 | November 12, 2021 00:00 | November 12, 2021 02:30 | 2h 30m | 3,262 | 3,419 |
| 2 | June 15, 2021 00:15 | June 15, 2021 03:00 | 2h 45m | 2,457 | 801 |
| 3 | April 12, 2021 14:45 | April 12, 2021 18:15 | 3h 30m | 1,406 | 376 |
| 4 | March 25, 2021 21:45 | March 26, 2021 20:30 | 22h 45m | 1,242 | 7,696 |
| 5 | December 30, 2021 07:45 | December 30, 2021 17:30 | 9h 45m | 1,135 | 9,381 |
| 6 | July 19, 2021 00:30 | July 19, 2021 03:00 | 2h 30m | 894 | 2,008 |
| 7 | August 17, 2021 11:15 | August 18, 2021 00:00 | 12h 45m | 845 | 1,926 |
| 8 | January 13, 2021 13:15 | January 13, 2021 14:00 | 45m | 706 | 529 |
| 9 | August 19, 2021 21:00 | August 20, 2021 08:15 | 11h 15m | 696 | 6,073 |
| 10 | February 13, 2021 00:00 | February 13, 2021 00:45 | 45m | 444 | 333 |
Outage episodes by size in 2021: 46 reached 100+ customers, 5 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 Chester 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 |
| York Electric Coop Inc | 2021 | 76 min | 0.75 | 67 min | 0.66 |
| Duke Energy | - | - | - | - | - |
| Fairfield Electric Coop, Inc | - | - | - | - | - |
| Lockhart Power Co | - | - | - | - | - |
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 ÷ 20,548 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. Chester County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Chester 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/chester-county