Business Green: London Mayor Boris Johnson this weekend unveiled plans for a city-wide network of electric car charging points to support a predicted 100,000 new battery-powered vehicles on the capital’s streets. Source London aims to install 1,300 charging points across London by 2013 to service the expected increase in electric vehicles (EVs) as major manufacturers such as Nissan and Mitsubishi release new models. From spring next year, scheme members can pay an annual £100 fee in order to power up their…