A solar farm in Dorset is to power London’s Square Mile. The City of London Corporation expects to save £3m by buying over half of the electricity powering the historical financial district from a subsidy-free solar farm in the south-west of England made up of 95,000 new solar panels over the next 15 years. Its 49 megawatts will be fed into places like the Square Mile’s historic Guildhall buildings, the Barbican arts centre, and the Smithfield, Billingsgate and New Spitalfields markets, which are also overseen by the corporation.