County annual report · FIPS 45023
2020 Chester County, SC Power Outage Report
In 2020, customers in Chester County, SC went without power for an average of 9.0 hours, a total of 185K customer-hours (South Carolina average 5.7 hours). That ranks 10th worst of 46 South Carolina counties and 865th of 3,019 nationally.
Compared with SC, the US and 2019
Coverage line is EAGLE-I's share of South Carolina customers tracked each year.
Biggest outages in Chester County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 22, 2020 20:15 | May 25, 2020 02:45 | 2d 6h | 3,480 | 63K |
| 2 | April 13, 2020 12:45 | April 15, 2020 18:45 | 2d 6h | 2,024 | 37K |
| 3 | July 14, 2020 18:00 | July 14, 2020 22:30 | 4h 30m | 1,866 | 3,156 |
| 4 | August 17, 2020 07:45 | August 17, 2020 09:45 | 2h | 888 | 1,776 |
| 5 | March 6, 2020 20:00 | March 7, 2020 11:00 | 15h | 886 | 2,537 |
| 6 | October 29, 2020 12:45 | October 30, 2020 22:00 | 1d 9h | 800 | 7,444 |
| 7 | August 29, 2020 15:15 | August 30, 2020 10:45 | 19h 30m | 696 | 743 |
| 8 | October 7, 2020 02:15 | October 7, 2020 04:00 | 1h 45m | 682 | 853 |
| 9 | January 13, 2020 13:15 | January 13, 2020 18:30 | 5h 15m | 534 | 934 |
| 10 | September 30, 2020 19:30 | September 30, 2020 19:45 | 15m | 503 | 126 |
Outage episodes by size in 2020: 44 reached 100+ customers, 3 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 2020, 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 | 2020 | 11.2 hrs | 1.71 | 3.1 hrs | 1.18 |
| York Electric Coop Inc | 2020 | 3.4 hrs | 0.99 | 72 min | 0.69 |
| 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 2020; 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, 2020, 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/2020/south-carolina/chester-county