The total cost of an installed system is around $10 per watt before rebate, on most sites. The net cost is equal to the total cost minus the rebate.

Note: As a clean and quiet energy producer, solar power has gained enormus benefit to the environment. An average of 20 tons of carbon dioxide are saved per kilowatt installed. It would take two years of not driving your car to equal that amount of conservation for one kilowatt.