Campaigners say many households are still struggling to pay bills, as well as repay £4bn of energy debt that built up during a period of high prices.
Simon Francis, coordinator of the End Fuel Poverty Coalition, said this would mean another winter of high prices.
“The average family still paying hundreds of pounds more than they did just a few years ago,” he said.
Some support comes from local communities. Staff at Parc Primary School at Cwm Parc in the Rhondda Valley provide extensive help for families struggling with everyday costs, including their energy bills.
The school is partnered with the Fuel Bank Foundation charity, providing vouchers to low-income families to meet energy costs.
“We’ve got a high level of need, and over the last couple of years we’ve seen that more and more. People are really struggling. And not only with the fuel, but life in general,” said Leanne Gough, the school’s family engagement officer.
“Sometimes you issue a fuel bank voucher and you can see the relief on their face, but it is a short-term. People are proud, so it takes a lot for them to come to ask. They will do everything they can beforehand.”