Porsche is going full steam ahead with its electrification programme, as the all-electric Mission E has now been seen undergoing road tests in prototype form. First shown as a concept at the 2015 Frankfurt Motor Show, the development mule adopts a shape very similar to the Panamera in its sports sedan silhouette.

In front sits an air intake wider than the one on the concept car, as do the brand’s current signature four-point LED headlamps, which – as on the show car – have wider LED elements beneath the camouflage. Additional LED daytime running light strips are placed on each side of the front bumper, which also features less dramatic scoops leading to the headlamp enclosures.

Further along the test mule pictured here, the roof surface is flatter – in contrast to the scalloped roof on the show car – while the latter’s suicide doors have been ditched for more conventional portals. One can also spot the charging port cover aft of the right front wheel.

Around the back, more production-ready design is also adopted here, with a rear fascia and bumper shaped rather closely after that of the next-generation 911 mules. Beyond the concealments, the Porsche badge can be expected to reside beneath the near-full width bootlid spoiler.

The overall shape of the rear apron has largely been retained on the mule, though the diffuser element itself has been toned down in this prototype guise. Also here are a pair of fake exhaust pipes, which are likely there to disguise the fact that this is an electric vehicle.

The latest mechanical details aren’t available just yet, though in concept form the Mission E boasts 600 hp courtesy of a pair of permanent magnet synchronous motors, driving all four wheels. Operational range will be over 500 km, according to Porsche, while a 15-minute charge provides up to 400 km in range, thanks to 800 volt/350 kW charging technology.

Zero to 100 km/h is done in a claimed 3.5 seconds and 200 km/h in 12 seconds. The new all-electric model will have its own bespoke EV platform rather than adapting the Panamera’s, with its lithium-ion battery forming the floorpan between the two axles.

When it makes its expected debut in 2019, the all-electric Porsche will follow present Porsche line-up strategy – there will be a number of variants across the model range similar to base, S, and GTS versions of the 911, Porsche boss Oliver Blume told Car Magazine. The final production Mission E is expected to be priced from a similar starting point as the Panamera.