A product labelling trial which puts the lifetime electricity running costs on washing machines, washer dryers and tumble dryers is being launched.
Up to 500 volunteers will help shoppers at John Lewis in London's Oxford Street compare, switch and potentially save money by thinking of using more energy efficient goods.
Swapping an old washer dryer could save £500 in lifetime energy costs and 84% of people have not switched energy supplier in the last year, potentially missing out on up to £158 savings on energy bills, according to Energy Secretary Edward Davey.
He is to say at the launch: "In the past, people have had no idea how much their appliances will add to their energy bills.
"Now consumers will be able to see clear, simple information on the lifetime electricity costs for appliances like washing machines and tumble dryers. This will help people to make better, more informed decisions and see how much an appliance is expected to cost over its lifetime."
Around 500 volunteers will be trained through the Big Energy Saving Network - one of their aims will be to raise awareness among vulnerable people such as pensioners of how to get help.
Stephen Cawley, head of sustainability at John Lewis, adds: "The new labelling is designed to provide customers for the first time with lifetime running costs of washing machines, tumble dryers and washer dryers, so that they are able to make more informed decisions and comparisons when purchasing new models.
"We are looking forward to reviewing the results of the trial next year and seeing how customers respond to new more transparent labelling around the energy efficiency of these products."