He argues that the lack of transparency in energy tariffs is largely down to a lack of competition in energy provision. He also argues that the government has no business to tell suppliers what they should charge - people and households are different and only they can decide what is the best option for themselves. Ultimately it is competition and not politicians that could bring down energy prices successfully.
You can read his article here.
Dr Eamonn Butler writes on the Spectator CoffeeHouse blog on Cameron's announcement to force energy companies to give customers the lowest tariff.