John Lewis, the High Street department store chain, is to display the lifetime running cost of the electrical goods it sells.
The initiative is part of a wider Government plan to cut energy use by 11 per cent by 2020.
The Energy Efficiency Strategy, published yesterday by the Department for Energy and Climate Change, includes the trial with the John Lewis trial highlighted as one of its three key strands.
The DECC said John Lewis will begin labelling products with lifetime electricity costs next year.
Under currents European Commission rules, it became compulsory in July 2011 for retailers to display an energy rating on each appliance, from A to G.
As products have improved, new A+, A++ and A+++ energy ratings have been added for fridges, washing machines and dishwashers.
Government believe it can exert more influence over buying decisions by informing consumers the real total cost of running an appliance. Less efficient devices are often cheaper to buy but more expensive to run.
The DECC said: 'A similar trial in Norway showed 'this information led to consumers purchasing goods that are more energy efficient