The energy that is supplied to a business or domestic property is exactly the same so why pay more? The reason they are separate is because of the way these products are packaged. A domestic switcher will be able to choose from a market full of predefined tariffs, this is because many homeowners have very similar needs when it comes to energy consumption unlike businesses.

Every business has different energy consumption rates, for example a car manufacturer will use energy to power lights, heating and the machines that build the cars. A small office will use the energy to power the lights and heating, and maybe a few computers. As the energy consumption and type will vary from business to business, energy suppliers would offer contracts that are unique to that business each time they quote.

Gas and electricity are sold separately meaning they must be under separate contracts, even if they both come from the same supplier.