The Citizens Advice Bureau says it is receiving about 3000 enquiries every year from people seeking information about bills, insulation and other electricity issues.
The bureau receives more than 10,000 calls from people seeking advice with their general financial difficulties.
National research and policy adviser Andrew Hubbard said rising power prices mean more people are struggling to pay their bills.
He said residential power prices have increased 87% over the past 10 years, a real-price increase of 48% after inflation.
"That's a signficant part of people's costs, particularly when they're on lower incomes."
Mr Hubbard said people should check they are paying the best price for electricity and that they have chattels such as curtains to keep the heat in.
