Martin Lewis today said he "would welcome" Government plans to freeze energy bills - but called for more help for fixed-rate customers.
Liz Truss is reportedly considering a freeze on energy bill prices to deal with the cost of living crisis.
The Government has not yet confirmed any specifics, but Truss could freeze energy bills at around £2,500 per household, The Times reports.
The big freeze would cost between £90billion and £130billion, experts think.
MoneySavingExpert founder Martin said any freezing of energy bills would be a big help - but admitted more targeted help might be needed.
Martin took to Twitter to give what he called "my rough provisional analysis of what may be coming".
"Freezing the price cap now would help substantially," he said.
He said freezing the price cap at its current level would be a "sigh of relief for many".
But he said the cost of this scheme would need to be paid back, and may not give enough help for those really struggling.
"The big benefit, and problem, of this is (almost) everyone gets it," he said.
"And those who gain the most from it in cash terms will be those with the highest bills (many, though not all, will be at higher income levels), so clearly it isn't targeted at helping those who need it most."
Martin also pointed out that many energy users may have locked in to fixed rate deals - and may not benefit from the price cap freezing.
This price cap is due to rise to £3,549 in October.
Because of this, up to 15% of households have taken out fixed rate deals higher than the current price cap, thinking it would save them money in the long run.
Martin said: "So what happens? Will they automatically be put on the price freeze? If they are not automatically moved, will they be allowed to switch to the price freeze?"
He later added on Twitter: "Have you applied to fix your energy bills in the last 14 days? If so you're within the cooling off period.
"As there are rumoured big changes coming [on Thursday], be prepared to cancel if you still can."
The MoneySavingExpert boss also noted that even freezing at the current price cap still means really high bills.
He said: "We're freezing at the current level, but that is already high. If we freeze now, we have already seen the price cap rise 50%, so we're freezing at a high level (and higher than some other countries have)."
What is the Ofgem energy price cap?
The price cap is altered every three months, in January, April, July and October.
This means the next time it is set to be altered is in October, then again in January.
Ofgem first introduced the price cap in 2019 and it is based on a number of factors including the wholesale cost of power.
This is why the price cap has gone up.
The cost of wholesale gas soared following the Covid pandemic - with suppliers pushing the increase onto customers.
Businesses being shut down led to low global energy consumption, which was then followed by a rapid bounceback as the economy began to open up again.
Prices have since risen further following the Russian invasion of Ukraine.
