No upfront cost! Total cost of installation to you is $0. Total cost of maintenance and insurance for the system, also $0. You can immediately starts saving money on your energy bills and most leasing plans include the insurance. They provide all of the equipment, complete the installation and take care of any and all necessary maintenance. If you live in a high power cost area, these companies are essentially willing to rent the sunny parts of your roof from you. They cover all of the costs involved, you save on or eliminate your electric bill and they profit over the long term buy pushing the excess back into the grid at the peak usage times (during the day) when the energy rates are the highest.