Washington's full-retail net metering and sales tax exemption help, though low hydro-based rates lengthen payback. Here are Washington's 2026 solar incentives, electricity rates, net metering rules and typical payback — plus tools to run your own numbers.
SCReviewed by Sarah Chen, Energy AnalystSources: DSIRE, EIA, IRS
Solar economics in Washington are shaped by an average rate near ~11¢/kWh and moderate sunshine. Photo: American Public Power Association / Unsplash
Quick answerSolar in Washington typically pays back in 11–14 years. With electricity rates around ~11¢/kWh, moderate sunshine, and the 30% federal tax credit, a 7 kW system costing ~$21,000 drops to about $14,700 net before Washington's own incentives. Headline state perk: Sales tax exemption + full net metering.
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Washington solar at a glance
Avg electricity rate~11¢/kWh
Typical payback11–14 years
SunshineModerate
Net meteringNet metering (full retail)
Federal tax credit30% (2026)
7 kW net cost*~$14,700
*National-average $3.00/W system after the 30% federal credit, before Washington state incentives.
Is solar worth it in Washington?
Washington's full-retail net metering and sales tax exemption help, though low hydro-based rates lengthen payback. At an average residential rate of about ~11¢/kWh, every kilowatt-hour your panels produce is a kilowatt-hour you don't buy from the utility — and that avoided cost is what drives your payback. Combined with moderate sunshine, a standard 7 kW system in Washington generally pays for itself in 11–14 years after the 30% federal credit, then delivers a decade or more of nearly free power.
To see your own number rather than this state average, plug your actual electric bill into the Solar Payback Calculator. If you're weighing how to pay, the Financing Calculator compares cash, loan and lease side by side.
Washington solar incentives in 2026
Beyond the federal 30% Residential Clean Energy Credit, which applies everywhere, Washington offers:
Sales tax exemption on residential solar systems up to a set size
Full-retail net metering statewide
No state income tax, so the federal credit is claimed cleanly
State programs change frequently. Always confirm current details and eligibility on the DSIRE database and with a licensed local installer before you sign anything.
Net metering in Washington
Washington uses Net metering (full retail). Net metering is the second-biggest factor in your solar economics after your electricity rate, because it determines how much credit you earn for the excess power your panels send back to the grid. Generous, full-retail net metering shortens payback; reduced export rates lengthen it and increase the value of pairing your system with a home battery.
Run your Washington solar numbers
Use your real electric bill for a personalized payback — free, no sign-up.
Yes for most Washington homeowners. With average electricity rates around ~11¢/kWh and moderate sunshine, a typical 7 kW system pays back in about 11–14 years after the 30% federal tax credit. Your exact result depends on your roof and usage — run it in the Payback Calculator.
What solar incentives does Washington offer in 2026?
On top of the 30% federal Residential Clean Energy Credit, Washington offers: Sales tax exemption on residential solar systems up to a set size; Full-retail net metering statewide; No state income tax, so the federal credit is claimed cleanly. See the full list with current details on DSIRE.
How does net metering work in Washington?
Washington uses Net metering (full retail). Net metering rules are the second-biggest driver of solar value after your electricity rate, because they set how much you earn for the excess power you export to the grid.
How much does solar cost in Washington?
A typical 7 kW residential system runs about $21,000 before incentives at the 2026 national average of $3.00/W, or roughly $14,700 after the 30% federal credit — before any Washington state incentives. Use the Tax Credit Calculator to confirm your federal credit.
Sarah has spent 12 years modeling US residential solar economics, including 4 years contributing to NREL's Distributed Generation Market Demand model. She holds a BS in Mechanical Engineering from UC Berkeley and reviews every calculator and state guide on GreenCalcs against current IRS, DSIRE and EIA data. Read our methodology →
