ENERGY bills for 15 million UK households will increase by at least £139 from October, regulator Ofgem has said. : We use your sign-up to provide content in ways you've consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time. More info The cap on the average annual consumption of gas and electricity on the standard tariffs will rise by £139 to £1,277 per year. Around 11 million households in the UK currently use this method.