SEATTLE - Drivers who travel through downtown Seattle will experience lane closures on the busy Denny Way over the next four weeks.

As part of the Seattle City Light’s construction on the future Denny Substation, they will need to cut through Denny Way to provide utility services for the building itself.

Through the construction, from Stewart Street to Minor Avenue, drivers will notice one lane closed in each direction seven days a week, and all lanes on the weekend of Nov. 19 and 20. The biggest portions of their work will happen on weekends and overnight, but Seattle City Light believes the biggest traffic impact will happen Monday through Friday.

All lanes on Denny Way will reopen on Monday, Nov. 21.

“We know that this is going to be an inconvenience for folks, but we want them to know ahead of time that it is coming so that they can make better plans for how they might get to work or wherever they might be going in that area,” Seattle City Light’s Scott Thomsen said. “Denny Way is obviously a major arterial into downtown. A lot of people use it every day. We have scheduled the work to minimize the impact on commuters as much as possible but there is going to be some impact.”

The future Denny Substation is City Light’s first and largest substation in 30 years. It the utility says it will increase reliability for City Light customers in the city of Seattle.

“As you know the city of Seattle has been one of the fastest growing cities in the last three to four years, and it's increasing the amount of electricity that we need to deliver to our customers and in addition to that, increasing the reliability throughout our system is an important feature for all of our customers,” Thomsen said. “The substation itself is being put in to increase the reliability of service across our service territory by having one more place where we bring power in from our hydroelectric dams and our other resources to be distributed to our customers.”

The total cost of the future substation is a little more than $200 million.