This information will be provided on the bill you receive from your energy provider. Your electricity bills are guaranteed to decrease after the installation of solar panels. However, by how much will depend on different factors, including your system size, the orientation of your roof on which the panels are installed, your house location, shade from trees, your day and night household electricity consumption, plus the agreed cost of import and feed-in tariff costs with your electricity retailer and etc. Rest assured, Foton will always recommend the best design for optimum performance for your building.