The cost of solar panels in Mercer Island, WA (2024)

Updated Mar 15, 2024

  • You'll pay an average of $14,440 to install a 5 kilowatt solar panel system in Mercer Island, WA, before incentives.

  • The federal investment tax credit (ITC) lowers that price by 30% of all your solar equipment and installation costs.

  • With EnergySage's competitive marketplace, you can expect to see prices up to 20% lower than if you work with a single company.

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Written by: Emily Walker

As of March 2024, the average solar panel system costs $2.89/W including installation in Mercer Island, WA. For a 5 kW installation, this comes out to about $14,440 before incentives, though prices range from $12,274 to $16,606. After the federal tax credit, the average price drops by 30%.

Average price of a 5 kW solar panel installation in Mercer Island, WA

Good Price
$12,274 or less
Market Average
$14,440
High Price
$16,606 or more

You'll probably pay even less than what we show here. It doesn't include the federal ITC or Mercer Island, WA state incentives, which will lower this price by at least a few thousand dollars.

Your solar panel cost depends on your system's size

It may seem obvious but larger solar panel systems cost more money. We use cost per watt ($/W) so you can easily compare quotes, controlling for slight variations in system size.

While a 5 kW system will only cost you $14,440 in Mercer Island, WA, doubling the system size effectively doubles the price, so you'll pay about twice that for a 10 kW system. The higher the price tag, though, the more you'll get back as a credit towards your federal tax bill.

Average solar cost by system size in Mercer Island, WA

System Size
System Cost
System Cost (after ITC)
3 kW$8,664$6,065
4 kW$11,552$8,086
5 kW$14,440$10,108
6 kW$17,328$12,130
7 kW$20,216$14,151
8 kW$23,104$16,173
9 kW$25,992$18,194
10 kW$28,880$20,216

Are solar panels worth it in Mercer Island, WA?

Solar panels are worth it in most areas, including Mercer Island, WA. Certain factors, including the cost of electricity, incentives, climate, and the angle at which the sun hits your roof impact how quickly you break even on your investment relative to other areas around the U.S. 

If you pay for your system with cash, you'll save about $6,737 over 20 years on electricity costs with a 5 kW system in Mercer Island, WA. We generate this estimate based on real solar quote data from our Marketplace. It considers your system's cost, the federal tax credit, and inflation rates.

Payback Period
15.99 Years
20-Year Savings
$6,737
Cost-per-Watt
$2.89

If you can't shell out $14,440 in cash to pay for solar, don't sweat it. You can choose to finance your system with a loan instead. Some companies even offer $0-down loans so you can start saving on day one if your loan payments are less than your current electric bills. Just keep in mind that your long-term savings will be lower with a loan due to interest rates.

Find out what solar panels cost in your area in 2024
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The numbers we're showing are averages. The price you'll pay for solar depends on many factors unique to you and your home:

If you're looking for solar companies in WA, here are some popular suggestions:

  • Blossom Solar
    Everett, WA
    Established 2017
    Elite Installer
    As the Gold Medal Winner of the Seattle Times - Best In The PNW for Solar Energy Provider, our mission is to prov...
    Elite Installer
    Screened & Verified
    5.0 /5.0
    39 Reviews

    As the Gold Medal Winner of the Seattle Times - Best In The PNW for Solar Energy Provider, our mission is to prov...
  • Swiftwater Electric and Solar Inc.
    Cle Elum, WA
    Established 21
    Elite Installer
    We're a small firm with a combined experience of 25 years in the solar industry. We focus on low overhead and gre...
    Elite Installer
    Screened & Verified
    5.0 /5.0
    9 Reviews

    We're a small firm with a combined experience of 25 years in the solar industry. We focus on low overhead and gre...
  • Solora Solar LLC
    Issaquah, WA
    Established 2011
    Advanced Installer
    Earn 30% federal tax credit based on the total cost of your residential solar power system!

    100% sales tax exempti...
    Advanced Installer
    Screened & Verified
    5.0 /5.0
    40 Reviews

    Earn 30% federal tax credit based on the total cost of your residential solar power system!

    100% sales tax exempti...
  • Sun Path Electric
    Seattle, WA
    Established 2018
    Advanced Installer
    We are a locally-owned family business that believes protecting our environment for future generations is a moral...
    Advanced Installer
    Screened & Verified
    5.0 /5.0
    9 Reviews

    We are a locally-owned family business that believes protecting our environment for future generations is a moral...
  • SolTerra Solar
    Seattle, WA
    Established 2008
    Approved Installer
    With thousands of installations already completed in the Pacific NW, going Solar has never been easier. Help the ...
    Approved Installer
    Screened & Verified
    5.0 /5.0
    14 Reviews

    With thousands of installations already completed in the Pacific NW, going Solar has never been easier. Help the ...

Solar is a major purchase, but you can get the price tag to come down a bit by being an educated shopper. Taking advantage of incentives and rebates and shopping around for quotes can bring down your cost of solar in Mercer Island, WA.

Take advantage of federal and local solar incentives

As long as your federal tax bill is high enough, you can take advantage of the federal tax credit in Mercer Island, WA. This incentive allows you to apply 30% of your solar installation and equipment costs toward your federal tax bill. If the amount exceeds your tax bill, you can roll over the remaining credit to the following year. Many states also offer great local incentives and rebates.

Get quotes from multiple installers

Comparing multiple solar quotes can save you money through competition and transparency. Each additional quote you receive for solar will help you find the right solar panel system at the right price.

This is where EnergySage can help. With funding from the Department of Energy’s SunShot Prize, EnergySage opened the country’s first (and now the largest) marketplace for home solar panel installations. We gather custom solar quotes from local installers on your behalf and put them in an easy-to-compare format. When you compare quotes for solar panels on the EnergySage Marketplace, you can expect to see prices up to 20% lower than if you work with a single solar company.

Why shop with EnergySage?

Save time & money

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Unbiased support

Our expert Energy Advisors will help you make the right decision

Trusted, local installers

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