Age Cymru warning over new energy bills
4 October 2013 Last updated at 14:50 BST
Vulnerable people already struggling with household finances could be hit hard by changes to gas and electricity bills, the charity Age Cymru has warned.
Energy firms are introducing new tariffs supposed to make fuel costs clearer. But it also means most bills will include a new standing charge, costing up to £400 a year.
The trade association representing the industry said firms would try to ensure customers were on the best tariff.
Charlotte Dubenskij reports.