He said: “This year is going to be a very tough year for many people.
“The energy price crisis needs substantial intervention from the Government.
“We are going to see a minimum 50% increase in energy prices in the system and that is unsustainable for many.”
The Government’s energy price cap is due to be revised in February, with the increase put onto customers’ bills from April.
According to Cornwall Insights, an energy sector specialist, bills could rise from £1,277 a year under the current price cap to £1,865 a year when the next revision is announced, a rise of 46%.
They also predict it could spike to £2,240 a year at the following quarterly revaluation in August 2022 without a significant fall in energy prices globally.
Mr Lewis said: “We need to look at what we can do now and how we can protect those people who will need to choose between heating and eating.
“There are already some who are having to make that choice.
“We need to look at the whole structure of the energy market.
“The Government didn’t intervene early enough so we’re all paying for the market collapses we’re seeing.”
Several firms went bust in 2021, with customers at other energy firms picking up the tab for the collapses, whilst the Government also took over the running of Bulb after it failed last November.
Ofgem has subsequently announced changes to how much other energy firms, and eventually customers, can be forced to pay to fund rivals’ collapses.
However, many in the industry say more needs to be done to avoid future companies from going bust and stricter rules put in place over who can run suppliers.
Mr Lewis added: “What’s coming in April is a seismic hit for fuel bills which is going to be astronomical.
“They have to sort this now because if we leave this before it’s too late it will be a disaster.”