The cheapest business energy suppliers in the UK are: - British Gas - E.ON - Scottish Power - Npower - SSE. Although this is just an average as wholesale energy prices do change regularly. So you are ALWAYS advised to get the current prices on ALL suppliers when you look for a business energy quote. Businesses are looking for a reliable and affordable energy supplier. The cheapest energy suppliers in the UK have a range of tariffs to suit different business needs. The cheapest energy suppliers in the UK are offering a range of tariffs to suit different business needs, and so it’s worth comparing prices from all of them before signing up. Electricity is an essential part of any business, but with so many electricity providers on the market it can be hard to know who is the cheapest supplier for your business. There are many factors that need to be considered when choosing an electricity provider such as what kind of tariff you want and how much you use each month.