No matter in which country you are living right now (US, UK or AU), if it is a developed country like United states of America or any other European country then there is hundred percent chances that your government will approve a subsidy to you if the solar power PV panels are set in your rooftop.  In 2005 when I visited the market place I saw that the storekeeper was asking hundred dollars for a solar panel, but in 2013 when I visited the marketplace I saw that the storekeeper is asking only for $ 10 for a solar photovoltaic panel.