What Solar Incentives and Rebates Are Available in Washington State?

Thinking about going solar in Washington? You're in good company. The Pacific Northwest has seen a steady rise in residential solar installations — and for good reason. Between federal tax credits, state-level exemptions, and utility programs, homeowners can significantly reduce the upfront cost of a solar system.

This guide breaks down every major incentive available to Washington residents so you can make an informed decision before you sign anything.

The Federal Solar Tax Credit (ITC)

The biggest financial benefit available to any American going solar right now is the federal Investment Tax Credit, or ITC. As of 2025, the ITC allows you to deduct 30% of your total solar installation cost from your federal income taxes.

A few important notes:

• This is a tax credit, not a rebate — it reduces what you owe the IRS, not what you paid upfront.
• You must have enough tax liability to use it. If you don't owe that much in federal taxes, you can roll unused credits forward to future years.
• It applies to panels, inverters, labor, and battery storage in most cases.

The 30% rate is currently scheduled to step down after 2032, so timing matters if you're weighing your options.

Washington State Sales Tax Exemption

One of Washington's most valuable solar perks is a sales tax exemption on solar energy systems. Washington has no state income tax, which means there's no state-level solar tax credit — but the sales tax exemption makes up for some of that gap.

Under Washington law (RCW 82.08.962), the sale and installation of solar energy systems for residential use are exempt from the state retail sales tax. Washington's base state sales tax rate is 6.5%, and local rates bring the combined average close to 9-10% in many counties. Skipping that on a $20,000–$30,000 system adds up fast.

Key requirements:

• The system must be used primarily to generate electricity.
• The exemption applies to equipment and installation labor.
• Check with your installer to make sure they are applying the exemption correctly at the time of purchase.

Property Tax Exemption for Solar

When you add solar panels to your home, its market value typically goes up. In most cases, that would mean a higher property tax bill. Washington protects you from that.

Under state law, the added value from a solar energy system is exempt from property tax assessments for residential properties. This means your county assessor cannot raise your assessed property value simply because you installed solar panels.

This exemption effectively saves you money every year you own the system — not just at installation time.

Net Metering in Washington

Net metering is how you get credit for excess electricity your solar panels send back to the grid. Washington requires most investor-owned utilities and electric cooperatives to offer net metering to residential customers.

Here's how it works in plain terms:

• On sunny days, your panels may produce more power than your home uses.
• That surplus goes to the grid, and your utility credits your account.
• On cloudy days or at night, you draw from the grid — and those credits offset what you owe.

Important: Net metering policies and credit rates vary by utility. Puget Sound Energy, Pacific Power, and local co-ops each have their own rules. Some pay retail rate for excess power; others pay a lower rate. Always confirm your utility's current policy before your system goes live.

If you're not sure which programs your utility offers, our intake team can point you in the right direction.

Utility and Local Rebate Programs

Beyond state law, several Washington utilities offer their own rebate programs. These change periodically, so availability depends on your location and provider.

• Puget Sound Energy (PSE): Has historically offered solar rebates and battery storage incentives. Program availability and funding caps change — check PSE's website or ask your installer.
• Seattle City Light: Offers energy efficiency rebates and has supported clean energy programs. Solar-specific programs vary by year.
• Snohomish County PUD and others: Some public utility districts have offered modest solar incentives or green power programs.

Local programs often run out of funding mid-year, so acting early in the calendar year can help you capture available rebates.

FAQ: Washington Solar Incentives

H3: Does Washington have a state solar tax credit?

No. Washington does not have a state income tax, so there is no state-level solar tax credit. However, the sales tax exemption and property tax exemption provide meaningful savings that partially compensate for this.

H3: How much can I save with Washington's solar incentives combined?

Total savings depend on your system size, your federal tax liability, your local utility, and your county's tax rate. The 30% federal ITC alone can save thousands on most residential systems. The sales tax exemption can save hundreds to over a thousand dollars at purchase. Specific dollar amounts vary — confirm your full savings picture with a licensed installer and a tax professional.

H3: Can I combine the federal tax credit with Washington state incentives?

Yes. The federal ITC, Washington's sales tax exemption, property tax exemption, and any utility rebates are generally stackable. A tax advisor can help you structure the timing correctly.

H3: What happens to net metering credits if I don't use them all?

This depends on your utility's policy. Some utilities reset unused credits annually; others allow them to roll over. Confirm the specific rollover and compensation rules with your utility before installation.

H3: Is there a deadline to claim Washington's sales tax exemption?

The exemption applies at the point of sale — your installer should document it on your invoice. There is no separate application you file afterward. Always get written confirmation from your installer that the exemption was applied.

Next Steps: Is Solar Right for Your Home?

Washington's incentive package — federal tax credit, sales tax exemption, property tax protection, and net metering — makes residential solar a financially reasonable option for many homeowners. That said, every home is different. Roof condition, shading, utility rates, and your own tax situation all affect whether solar pencils out for you.

Before signing a contract, get at least two or three quotes from licensed Washington solar installers, and talk to a tax professional about how the ITC applies to your situation.

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