The high-pitched whirr of an electric car may not stir the soul like the bellow and growl of an internal combustion engine (ICE). But to compensate, electric motors give even the humblest cars explosive acceleration. Electric cars are similarly set for rapid forward thrust. Improving technology and tightening regulations on emissions from ICEs is about to propel electric vehicles (EVs) from a niche to the mainstream. After more than a century of reliance on fossil fuels, however, the route from petrol power to volts will be tough for carmakers to navigate.