The Tesla Model S rivalling model was given the green light for production last year and is set to go on sale in 2020. These pictures (below) suggest that arrival date is a realistic one, with testing now in full swing.
The model has an internal codename of J1. It has been conceived to sit on a bespoke platform designed to accommodate a lithium ion battery pack capable of providing the car with a range of more than 330 miles. In combination with two electric motors, the sleek four-door promises a 0-62mph time of just 3.5sec.
The new platform is said to be separate to the structure being developed by parent company Volkswagen for its new range of electric cars, which includes a production version of the Budd-E concept seen last month at the Consumer Electronics Show in Las Vegas.
Heading development of the zero-emissions Porsche is Stefan Weckbach, who previously led product strategy and more recently was responsible for the development of the Boxster.