By Sarah Young LONDON (Reuters) -Finance minister Jeremy Hunt said he wanted Britain to cut its energy usage by 15% by 2030 to help reduce bills, catching up with European neighbours which are already prioritising measures to counter spiralling prices. Countries across Europe are facing an energy crisis after Russia’s war in Ukraine caused prices to rise. In response, Germany and France have plans to reduce energy consumption and improve the efficiency of buildings. Britain on Thursday announced a new goal to cut consumption by 15% over the next eight years and Hunt said it would spend 6 billi…