E.ON is a German energy company that is shifting towards renewable energy. They are currently the the world's third largest offshore wind company, as well as working with solar energy, hydro and bio-fuels. E.ON also prides itself on transparent pricing, and high customer satisfaction and loyalty. They have introduced new features such as complaints forums and online chats, in order to be more available to customers.
Visit the E.ON Website to sign up for electricity or gas here. Although only in German, they have online tools to give you an estimate of your monthly cost of gas and electricity.