How long is solar payback in Washington?

Solar payback in Washington typically runs 7–12 years depending on your electricity rate, system size, sun hours, and whether you qualify for the federal 30% Investment Tax Credit plus any Washington state incentives. Use the calculator above for a personalized estimate.

What solar incentives are available in Washington in 2026?

All Washington homeowners qualify for the federal 30% Solar Investment Tax Credit (ITC) on the gross system cost. Washington may also offer a state tax credit, rebates from your utility, or favorable net metering. See the calculator inputs above for Washington-specific values.

Is net metering available in Washington?

Net metering rules vary by state and utility. Washington has its own rules — full retail credit, time-of-use rates, or buyback programs. The calculator above factors in Washington's effective net metering value when estimating your monthly bill offset.

How many sun hours does Washington get?

Washington's average peak sun hours per day (NREL TMY3 data) determines how much solar your system can generate. The calculator above uses Washington-specific irradiance to size the system from your monthly electricity bill.

Should I buy solar panels or lease them in Washington?

Buying outright (cash or loan) lets you claim the 30% federal ITC and any Washington state credit, and you own the energy. Leasing or PPAs let the installer take the credit but you avoid upfront cost. For long-term value in Washington, ownership almost always wins.

Solar Payback in Washington State (2026)

Washington State has the cheapest residential electricity in the continental US at roughly $0.11/kWh, thanks to abundant hydroelectric generation. That makes solar payback slow — typically 12-15 years. Washington has a 100% solar sales tax exemption and net metering with annual true-up at retail rate, but no state income tax credit.

Use the calculator below — your state is already selected. Adjust your monthly electric bill and system cost for a Washington-specific payback estimate.

Solar Payback Calculator (by State)

Estimate your system size, total cost after incentives, and break-even year for residential solar.

State

Monthly electric bill Average across the year. Used to size the system.

Your electricity rate ($/kWh) Auto-filled from state average. Override with your real rate from your utility bill.

System cost ($/Watt) 2024 national avg ~$2.85/W gross, before incentives. Quotes range $2.50-3.50.

Financing

Utility rate inflation (% / yr) US average ~2.8% over last 25 years. EIA forecasts ~3% through 2050.

Estimated payback period

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Select your state to get a precise estimate.

System size

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25-year savings

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Net cost after credits

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Year-1 savings

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Cost breakdown

Net out-of-pocket

Get free solar quotes from local installers

Estimates only. Real solar quotes depend on your roof, shading, local installer pricing, utility net-metering policy, and your specific tax situation for the federal credit. Not financial advice.

Cumulative savings vs. system cost

When the green line crosses the dashed cost line, you’ve broken even.

Washington solar specifics

1. Federal 30% ITC

Standard.

2. Sales tax exemption

100% sales tax exemption on solar PV equipment in Washington. Saves $1,500-$2,500 on a typical residential system (WA sales tax is 6.5% + local up to ~10% combined).

3. Full retail net metering

WA utilities (Puget Sound Energy, Seattle City Light, others) net meter at retail rate. Annual true-up: any excess credits at year-end are typically forfeited to the utility.

4. Low electricity rate

Hydro-powered electricity costs $0.10-$0.13/kWh — among the cheapest in the US. This is the structural issue for solar payback in WA.

5. Low sun hours

WA's 3.8 peak sun hours/day is one of the lowest in the continental US.

What 2026 Washington solar economics look like

Typical 7 kW WA system:

Gross system cost: $19,600 ($2.80/W)
Federal 30% ITC: -$5,880
Net cost: $13,720
Annual production: ~8,400 kWh (WA sun is below average)
Annual savings at $0.11/kWh, full retail NEM: ~$924
Simple payback: ~14.8 years

Solar in WA makes sense for environmental reasons but doesn't pay back economically in the way it does in higher-electricity-rate states.

How to use the Washington solar calculator above

The state is pre-selected. Adjust if needed.
Enter your typical monthly electric bill (averaged across the year).
The calculator auto-fills your state's average electricity rate and peak sun hours — override the electricity rate with your real $/kWh from your bill if you know it.
Adjust the system cost per watt based on quotes from local installers. Washington averages are typically within the $2.50–$3.50/W range for cash installs.
The output shows estimated system size, net cost after federal and state credits, year-1 savings, and 25-year cumulative savings.

Reviewed by the CalcCottage editorial team. Updated May 14, 2026. Estimates only — not financial advice. Verify current incentives at DSIRE.org before installing.

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