HOUSEHOLD energy bills will hit a three-year high in yet “another nail in the coffin” for budgets after Ofgem announced a 4 per cent rise from October.The regulator confirmed today that gas unit rates are set to rise from 6.29p per kWh last winter to 8p, up around 27 per cent year on year.It means the new cap is £1,723, which is £147 more than the same period last winter, when the October cap stood at £1,576, and 150 per cent higher than at the end of 2020.