Solar cost & payback in Washington
Short answer
In Washington, a home with a $150/month electric bill needs about a 16 kW solar system — roughly $33,642 after the 30% federal tax credit, saving about $1,801/year and paying back in ~18.7 years.
System size
16 kW
Cost after 30% credit
$33,642
Payback
18.7 yrs
20-yr net savings
$12,363
Solar in Washington
Washington averages about 3.5 peak sun hours a day and pays roughly 11¢/kWh. The figures above assume a $150/month bill and ~$3/watt installed, with the 30% federal tax credit. A bigger bill needs a bigger system; shading, roof orientation, and net-metering rules change the payback.
Your bill & roof
Estimate your solar savingsOther states
Frequently asked questions
How much do solar panels cost in Washington?
For a $150/month bill, about a 16 kW system — roughly $48,060 before incentives, or $33,642 after the 30% federal tax credit. Larger bills need bigger, pricier systems.
Is solar worth it in Washington?
Washington gets about 3.5 peak sun hours a day and pays ~11¢/kWh. A typical system pays back in ~18.7 years and saves about $12,363 net over 20 years — a longer payback, so run your own numbers.
What is the solar tax credit in Washington?
The 30% federal Residential Clean Energy Credit applies everywhere, including Washington — about $14,418 on the example system. Washington may add its own state incentives on top; check current programs.