Business Green: Motorists and businesses are to be offered grants of up to £5,000 when they buy electric cars or plug-in hybrids, under wide-reaching plans unveiled today by the government that will also result in the rollout of electric car charging networks and electric car demonstration cities. The £250m strategy is to be unveiled today by transport secretary Geoff Hoon and business secretary Lord Mandelson and is expected to centre on grants of between £2,000 and £5,000 being offered to consumers …