Which? backs Ed Davey over big six profit margins
10 February 2014 Last updated at 13:21 GMT
Consumer group Which? has said the Energy Secretary Ed Davey is right to question the profit margins made by the "big six" firms.
Mr Davey wrote to the energy regulator, Ofgem, as well as the Competition and Markets Authority, asking them to consider all possible remedies "including a break-up of any companies found to have monopoly power to the detriment of the consumer".
Which? executive director Richard Lloyd told BBC News, "It's the right question to be asking - we need the regulator to come back with some good, tough answers and very soon."