Although the photovoltaic power generation system is very simple, it offers many competitive advantages for both homeowners and companies. In the first place, by using free sunlight it greatly reduces electricity bills and saves large sums of money over time. Second, it is a clean renewable energy source which combat global warming by reducing the greenhouse gas emission. Third, photovoltaic systems require minimal maintenance and have life-spans of several decades, guaranteeing decades of reliable power generation Electrifying all or large parts of a house with solar power not only raises property values but also increases energy independence; for the property owner this is a tangible benefit Elsewhere, depending on the country or region in which you live there are government incentives and rebates which can make that initial investment more affordable and help bring about a more rapid rate of return on investment