The Labour leader has reportedly written to energy bosses warning them that if they do not work with him on his plans to freeze prices or they can risk reinforcing the idea that they are 'part of the problem', according to Sky News Political Correspondent Sophy Ridge:
Ed M has written to energy bosses saying they can work together "Or you can reinforce in the public mind that you are part of the problem"
As Ed Miliband clashes with the energy giants on prices, it is worth knowing how your expensive energy bills are actually made up.
A leading competition lawyer says an energy price freeze could leave Labour open to challenges from the courts or the European Commission.
Whether or not you approve of a state intervention into industry, there are at least two big potential obstacles for an energy price freeze.