Labour leader Ed Miliband has accused the energy companies of peddling "scare stories" about the potential impact of freezing energy prices for two years.
Mr Miliband dismissed suggestions that his plans were similar to the attempted restructuring of the energy industry in California in 2000, which had to be scrapped amid widespread price rises, power shortages and company insolvencies.
He told Daybreak: "California was a totally different approach. It was a deregulated approach, not the kind of approach we are talking about.
"This system can work, it will work, it must work and we are going to make sure it works."
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.