How much do solar panels cost in Washington?

In Washington, solar panel installation averages about $2.58 per watt. For a typical $150 monthly electric bill, a 11.3 kW system (29 panels) costs approximately $29,928 before incentives, or $20,950 after the 30% federal tax credit.

Is solar worth it in Washington?

Yes — with 3.95 peak sun hours per day and 14.4¢/kWh electricity rates, solar in Washington typically pays for itself in 11.3 years. The rating is Moderate.

Solar Panel Cost & Savings in Washington (2026)

Quick Washington Solar Facts

3.95

Peak Sun Hours/Day

14.4¢

Electricity Rate

$2.58

Install Cost/Watt

11.3 yrs

Avg Payback

In Washington, a typical 11.3 kW system (29 panels) costs approximately $20,950 after the 30% federal tax credit. With 3.95 peak sun hours per day and 14.4¢/kWh electricity rates, annual savings average $1,849 with a payback period of 11.3 years. Rating: Moderate. Source: NREL PVWatts v8 (PSH), US EIA July 2026 (rates), SEIA/EnergySage Q1 2026 (costs).

☀️ Calculate Your Washington Solar Savings →

How many solar panels do I need in Washington?

For a typical home with a $150 monthly electric bill in Washington, you need about 29 panels (11.6 kW system). Your exact number depends on your specific monthly usage and roof orientation.

What solar incentives are available in Washington?

Every US homeowner qualifies for the 30% federal Investment Tax Credit (ITC) through 2032. Many states also offer additional incentives — check our main calculator's Incentives tab for Washington-specific rebates, tax credits, and net metering policies.

Is Washington a good state for solar?

Washington has 3.95 peak sun hours per day (U.S. average: 4.98). With electricity at 14.4¢/kWh (U.S. average: 18.83¢/kWh), solar in Washington typically pays for itself in 11.3 years. Overall rating: Moderate.