Watch the new npower Wallace & Gromit ad in Wallacescreen. http://www.npower.com/wallacescreen npower helps consumers take control of energy usage with a new campaign offering smartpower monitors. The nation’s favourite animated characters are up to their usual ‘inventive’ mischief in delivering npower’s message of sensible energy consumption in the home. The loveable duo soon learns a valuable lesson in monitoring energy, as another invention goes wrong.