Brexit has added up to £370m a year to the price of power supplies from Europe, according to industry representatives who calculate that the total energy costs of leaving the EU could amount to £10bn by the end of the decade. Energy UK, the sector’s trade body, has called on Keir Starmer to negotiate a closer trading relationship with the bloc as part of the “reset” he is seeking with Brussels. Before Brexit, the UK procured power through the EU’s internal electricity market which brought together bids and offers in a system known as “single day-ahead coupling”, using an algorithm