County annual report · FIPS 45023
2025 Chester County, SC Power Outage Report
In 2025, customers in Chester County, SC went without power for an average of 3.7 hours, a total of 77K customer-hours (South Carolina average 3.0 hours). That ranks 16th worst of 46 South Carolina counties and 1838th 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 Chester 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 | September 16, 2025 13:45 | September 17, 2025 00:45 | 11h | 3,109 | 2,780 |
| 2 | May 26, 2025 05:15 | May 26, 2025 12:00 | 6h 45m | 2,386 | 12K |
| 3 | April 22, 2025 20:45 | April 23, 2025 17:45 | 21h | 2,371 | 11K |
| 4 | April 9, 2025 16:45 | April 10, 2025 01:00 | 8h 15m | 1,381 | 698 |
| 5 | November 12, 2025 13:15 | November 12, 2025 22:15 | 9h | 1,192 | 1,263 |
| 6 | July 27, 2025 23:30 | July 28, 2025 15:45 | 16h 15m | 911 | 5,353 |
| 7 | March 16, 2025 11:45 | March 16, 2025 20:15 | 8h 30m | 789 | 415 |
| 8 | May 13, 2025 13:30 | May 14, 2025 05:15 | 15h 45m | 789 | 1,130 |
| 9 | August 1, 2025 01:00 | August 1, 2025 08:30 | 7h 30m | 698 | 2,677 |
| 10 | January 11, 2025 04:45 | January 11, 2025 21:45 | 17h | 599 | 2,751 |
Outage episodes by size in 2025: 45 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 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 Carolinas, LLC | 2024 | 78.6 hrs | 2.50 | 2.9 hrs | 1.26 |
| York Electric Coop Inc | 2024 | 16.3 hrs | 2.20 | 89 min | 1.69 |
| 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 n/a of South Carolina's customers in 2025; 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, 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/chester-county