Washington solar runs on two quiet advantages: the state charges no sales tax on residential systems through 2029, and every major utility still credits exports one-to-one at retail. Hydro keeps rates lower than most states, around 14¢, but they are climbing, and Puget Sound Energy is re-examining its net metering schedule. EcoGen America reads the Evergreen State math without the fog.
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Washington solar runs on two quiet advantages: the state charges no sales tax on residential systems through 2029, and every major utility still credits exports one-to-one at retail.
Hydro keeps rates lower than most states, around 14 cents, but they are climbing, and Puget Sound Energy is re-examining its net metering schedule.
Modest rates make Washington a patience play: the tax exemption and full crediting do their work over years, not months.
EcoGen America reads the Evergreen State math without the fog, and flags where the crediting review could change the answer.
Low hydro rates mean longer paybacks that the tax exemption and 1-to-1 crediting steadily repay. We show the honest timeline.
Built-in checks for the sales-tax exemption applied, netting credited at retail, and production honest about western Washington skies.
We track the 2029 exemption horizon and Puget Sound Energy's net metering schedule review as it develops.
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Washington’s best solar incentive is the absence of a line item. Here is what the exemption is worth and when it ends.
System Price | Sales Tax You Do NOT Pay | The Terms |
|---|---|---|
$20,000 | ~$800 – $1,400 saved | State + local tax waived, rate varies by city |
$30,000 | ~$1,200 – $2,100 saved | Applies to systems under 100 kW |
Any size under 100 kW | 4-7% of the sticker | Exemption runs through December 2029 |
2029 sounds distant, but it is the only deadline Washington solar has. Buyers planning a purchase eventually should know the exemption has an end date; buyers deciding now should simply confirm it appears in the quote.
Demand a production estimate built on western Washington irradiance, not a national average. Our clouds are real; so is our long summer daylight.
Confirm the sales-tax exemption is reflected and the quote sits in the $2.80-$3.30/W market band.
One-to-one crediting banks summer surplus against dark Novembers. Ask your utility how long credits carry and what happens at year-end.
Free 15-minute call. Rates, credits, the PSE review, and your real payback.
The argument against Washington solar has always been 14¢ hydro power. The argument for it is what that number is doing.
Washington solar is a patient investment: modest returns today, structurally improving every rate case. Buyers who need fast payback should know that; buyers staying put for decades usually do fine.
Washington Contract Checks
Modest margins reward careful paperwork. Insist on these.
No sales tax on residential systems under 100 kW through 2029. The quote should show tax-free pricing, not bury the saving.
Cloud cover cuts production versus national models; long summer days give some back. The estimate should be built on local irradiance data.
One-to-one today, with PSE reviewing its schedule. What happens to existing customers if terms change belongs in writing.
With payback already patient, a dealer fee can push the math past sense.
Four checks, any Washington bid. The established shops here pass them without ceremony.
Vetted for licensing, local production honesty, warranties and complaint history.
Cheap power narrows the field. These cases should pause.
Who does well here: long-tenure homeowners on rising-rate utilities, high-usage all-electric homes, and anyone who values tax-free pricing and a legally protected credit over a fast payback story. Run yours in our worth-it breakdown.
Priced against the Evergreen market band, exemption included.
15 minutes, independent. Utility, production curve, tax line, verdict.
Talk to a Washington AdvisorNo obligation. 100% free service.
No. Residential systems under 100 kW are exempt from state and local sales tax through December 2029, saving roughly 4-7% of the sticker depending on your locality. The installer applies it automatically at sale.
It is the state’s best solar incentive, and the only one with a deadline.
Yes: exports credit one-to-one at the full retail rate across PSE, Seattle City Light, Snohomish PUD and most utilities, with summer surplus banking against darker months.
PSE is re-evaluating its schedule; ask in writing how existing customers would be treated under any change.
Yes, with realistic modeling. Cloud cover trims production versus sunnier states, but long summer days and cool temperatures, which panels prefer, give some back.
The test of an installer here is whether the production estimate uses local irradiance data and shows you the monthly curve.
Hydro power is cheaper than most states, around 14¢/kWh, so each offset kilowatt-hour is worth less. The compensation: rates are climbing, the hardware is tax-free, and the crediting is protected by law.
Washington solar is a patient, durable investment rather than a fast one, and good installers say so.
The rates, program terms and figures on this page come from the records below. Sources accessed between June 10, 2026 and August 21, 2026.
Dean Mahmoud is the CEO of EcoGen America. He has connected tens of thousands of homeowners with residential solar installers across all 50 states since 2021, and works directly with installation companies on solar pricing, financing, and what homeowners actually pay for rooftop solar.
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