As of 2025, the average cost of residential solar panels in the U.S. is between $15,000 and $25,000 before incentives. This typically translates to about $2.50 to $3.50 per watt of installed capacity (more on price per watt below). The total price depends on your system size, location, roof type, and installer.
Another measure of the relative cost of solar energy is its price per kilowatt-hour (kWh). Whereas the price per watt considers the solar system’s size, the price per kWh shows the price of the solar system per unit of energy it produces over a given period of time. Net cost of the system / lifetime output = cost per kilowatt hour
Pro tip: It can be helpful to know your solar price per watt before and after claiming the 30% tax credit. Ultimately, many factors figure into the price per watt of a solar system, but the average cost is typically as low as $2.75 per watt.
About 97% of solar panels quoted on the EnergySage Marketplace in 2025 are 400 to 460 watts—expect to see panel outputs in this range in your quotes. Your panels'' actual output will depend on your roof''s shading, orientation, and hours of sun exposure. The efficiency and size of your solar panels drive their power output.
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