King CountyPower Outage History
What this grade means
Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Nov 19, 2024 | 178 hrs | 518,386 (53%) | Unnamed event |
| Jan 12, 2021 | 109 hrs | 215,586 (22%) | Flood |
| Sep 11, 2024 | 4 hrs | 197,763 (20%) | Unnamed event |
| Nov 13, 2017 | 64 hrs | 132,417 (13%) | Unnamed event |
| Mar 13, 2016 | 12 hrs | 129,685 (13%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for King County, Washington that day.
Over the 12 years from 2014 to 2025, King County recorded 5,737 distinct power outage events, averaging 4.0 hours per event.
The single worst outage on record in King County started November 19, 2024, lasting 178 hours and leaving up to 518,386 customers without power (53% of the county) at its peak.
July has historically been the worst month for outages in King County, with 609 events recorded during that month across the dataset.
Based on this history, King County earns a Reliability Grade of D, placing it in the 28th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Washington
Counties with the closest reliability grade and national percentile to King County.
| County | Grade | National percentile |
|---|---|---|
| Kittitas County | D | 31st |
| Garfield County | D | 32nd |
| Whatcom County | D | 24th |
| Lincoln County | D | 23rd |
| Thurston County | D | 33rd |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in King County?
Between 2014 and 2025, King County recorded 5,737 outage events, averaging 4.0 hours each.
What is King County's reliability grade?
King County has a Reliability Grade of D, in the 28th national percentile.
What was the worst power outage in King County?
The worst outage on record started November 19, 2024, lasting 178 hours and affecting up to 518,386 customers.