Arden Energy's unique offering helps you reduce your bills through cheaper tariffs and integrating an energy management system into your building. This highlights any energy inefficient processes and practices that are wasting money. Arden Energy will purchase surplus solar pv electricity from you and sell it back to the national grid. Your unit rate of electricity will vary in cost each month, much like a variable mortgage. Fixed-rate mortgages cost more, and so does fixing your rate of electricity.