Electric carmakers like Tesla will be happy to hear this; According to a new report from the International Energy Agency, the global fleet of electric vehicles is likely to more than triple to 13 million by the end of the decade from 3.7 million last year. The report also shows that sales may soar 24 percent each year on average through to 2030. Tesla and Nissan have some of the best-known EVs on the road now, but major automakers from Volkswagen to GM and Audi have followed suit in announcing dozens of battery-powered versions of their models.