By Elliot Gulliver-Needham There are 2.9 million houses that will require £23.4bn in improvements to meet the government’s energy performance certificate (EPC) standards by 2030, according to Rightmove. New analysis from the property portal found that an average of £8,074 will have to be spent on rental homes to upgrade them to a C rating by EPC standards. Energy secretary Ed Miliband said he would be consulting on raising the minimum standard for private and social rented homes by 2030, which would require landlords to hold a minimum EPC rating of C versus the E currently required. More than …