1. Suppliers and switchingSwitching suppliersPriceComparing pricesSwitching supplier with existing debtsSwitching supplier with a smart meterSwitching supplier when your supplier goes out of businessSix major suppliers provide approximately 78 per cent of consumer supply. They are British Gas/Scottish Gas, E.ON Next (incorporating npower), ScottishPower, SSE/OVO Energy, EDF and Octopus Energy (incorporating Bulb and Shell).Some customers take both gas and electricity from the same company – this is known as ‘dual-fuel supply’ (see here).