Washington Goes Solar with SunPower®
Using Solar Panels In Washington
Famous for incredible rain, cloudy skies, and lush forests, Washington also receives a moderate amount of sunshine every year. While it is not among the sunniest states, many homeowners have found enough sunlight to reliably power a home.
The state formally began adopting solar in 2006 when voters passed the Renewable Portfolio Standard. As of Q2 2025, approximately 56,000 solar energy systems have been installed statewide.¹ Opportunities remain for further expansion.
Data from Google's Project Sunroof² shows that 81% of Washington roofs are viable for solar installations—about 3 million roofs with roughly 3.1 billion square feet of usable space. At full potential, solar in Washington could generate 70,400 MW DC, producing an estimated 72.4 million MWh of AC electricity annually.
Solar energy also offers Washington residents the chance to help preserve the state's natural beauty for future generations through clean, renewable power.
SunPower service areas in Washington: Tri-Cities, Everett, Redmond, Spokane, Tacoma.
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How Solar Power is Growing in the Evergreen State
Solar installations in Washington continue to grow. According to SEIA¹, solar deployment has steadily increased, and projections for the next five years indicate plans to more than double current statewide solar capacity.
As of Q2 2025, Washington has 893 MW of installed solar capacity from 56,154 installations—enough to power approximately 93,526 homes. The Clean Energy Transformation Act, signed on May 19, 2019, requires Washington to transition to 100% clean energy (zero greenhouse gas emissions) by 2045. Solar power is a key part of this planned transition.
Reasons To Install Solar Power Systems in Washington State
Although the electric grid remains the primary energy source for most of Washington, more homeowners are choosing solar for its practical and environmental advantages.
Benefits of installing solar include:
Environmentally friendly energy: Solar produces no direct emissions or pollutants. If all viable installations in Washington were built, the state could avoid an estimated 58.7 million metric tons of carbon dioxide emissions.²
More resilient power: With proper system sizing and a storage solution like the IQ Enphase 10C, homeowners may maintain power during grid outages caused by weather, natural disasters, or local service failures.
Homeowners across Washington are already experiencing these benefits. Speaking with a SunPower professional can help you evaluate whether solar is right for your home.
Understanding the Cost of Installing Solar Power in Washington
Washington offers incentives—including low-interest loans and utility rebates—that can help offset installation costs.
Cost factors include:
System size and capacity
Solar panel quality
Roof condition or necessary upgrades
Permitting requirements
Rebates or incentives
Installation company selected
Solar installation in Washington averages $2.67 per watt.³ Homeowners can consider solar leases or community solar programs if ownership does not fit their financial situation.
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What You Need to Do to Install Solar Power in Washington
Starting a solar installation starts with understanding your system's potential benefits and costs.
Short-term benefits:
Lower energy bills: Savings can begin immediately and continue through the system's lifetime. Over the past 25 years, many homeowners have saved thousands of dollars.³
Protection from utility price increases: Many customers enjoy predictable monthly energy costs, helping stabilize household budgets.
Long-term benefits:
Increased property value: Homes with solar installations may see value increases of up to 10%, depending on market conditions.⁴
Low maintenance requirements: Many solar systems require minimal upkeep and often last 30 years or longer.
SunPower helps homeowners find the right system for their needs and budget. To explore your options, request a free quote.