County annual report · FIPS 42029
2021 Chester County, PA Power Outage Report
In 2021, customers in Chester County, PA went without power for an average of 3.5 hours, a total of 941K customer-hours (Pennsylvania average 4.1 hours). That ranks 46th worst of 67 Pennsylvania counties and 1673rd of 2,974 nationally.
Compared with PA, the US and 2020
Coverage line is EAGLE-I's share of Pennsylvania 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 | September 1, 2021 10:45 | September 19, 2021 15:30 | 18d 4h | 11,807 | 261K |
| 2 | August 27, 2021 18:15 | September 1, 2021 07:00 | 4d 12h | 6,924 | 30K |
| 3 | June 8, 2021 12:00 | June 16, 2021 11:15 | 7d 23h | 6,826 | 57K |
| 4 | April 30, 2021 09:15 | May 2, 2021 17:45 | 2d 8h | 6,271 | 31K |
| 5 | March 26, 2021 13:00 | March 28, 2021 04:00 | 1d 15h | 4,729 | 33K |
| 6 | November 13, 2021 18:00 | November 14, 2021 23:45 | 1d 5h | 4,667 | 8,974 |
| 7 | June 28, 2021 12:30 | July 4, 2021 23:30 | 6d 11h | 4,657 | 20K |
| 8 | June 21, 2021 00:00 | June 24, 2021 02:00 | 3d 2h | 4,319 | 19K |
| 9 | October 21, 2021 05:16 | November 6, 2021 21:45 | 16d 16h | 4,259 | 65K |
| 10 | January 30, 2021 12:45 | January 30, 2021 19:15 | 6h 30m | 3,571 | 1,224 |
Outage episodes by size in 2021: 156 reached 100+ customers, 45 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 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 |
|---|---|---|---|---|---|
| PPL Electric Utilities Corp | 2021 | 2.9 hrs | 0.93 | 85 min | 0.64 |
| PECO Energy Co | 2021 | 3.1 hrs | 1.01 | 88 min | 0.83 |
| FirstEnergy Pennsylvania Electric 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 98% of Pennsylvania's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 267,257 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, PA 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/pennsylvania/chester-county