New Castle County Power Outage History
2014–2025 · Delaware
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 12, 2023 | 6 hrs | 61,872 (24%) | Dense Fog |
| Jun 23, 2015 | 20 hrs | 45,881 (18%) | Heat |
| Mar 2, 2018 | 82 hrs | 44,559 (17%) | High Wind |
| Dec 8, 2014 | 1 hrs | 36,234 (14%) | Unnamed event |
| Mar 14, 2017 | 61 hrs | 33,074 (13%) | Winter Weather |
Over the 12 years from 2014 to 2025, New Castle County recorded 2,407 distinct power outage events, averaging 2.2 hours per event.
The single worst outage on record in New Castle County started December 12, 2023 (Dense Fog), lasting 6 hours and leaving up to 61,872 customers without power (24% of the county) at its peak.
June has historically been the worst month for outages in New Castle County, with 301 events recorded during that month across the dataset.
Based on this history, New Castle County earns a Reliability Grade of B, placing it in the 64th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for New Castle County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides.
Similar counties in Delaware
Counties with the closest reliability grade and national percentile to New Castle County.
| County | Grade | National percentile |
|---|---|---|
| Sussex County | A | 90th |
| Kent County | A | 91st |
FAQ
How often does power go out in New Castle County?
Between 2014 and 2025, New Castle County recorded 2,407 outage events, averaging 2.2 hours each.
What is New Castle County's reliability grade?
New Castle County has a Reliability Grade of B, in the 64th national percentile.
What was the worst power outage in New Castle County?
The worst outage on record started December 12, 2023 (Dense Fog), lasting 6 hours and affecting up to 61,872 customers.