BMW has unveiled a new prototype for a hydrogen fuel cell-powered version of its i8 and says similar cars could deliver more than 300 miles (480 km) of range per tank (see photos).

The BMW i8 FCEV features a fully functioning hydrogen-electric propulsion system with mid-mounted cryogenic storage tank, plus new square-cut bodywork that may hint at the brand’s future design direction.

The i8 was displayed to the press alongside a hydrogen 5 Series GT prototype the automaker says could deliver 300 miles (480 km) of range, and dump all of its electric motor’s 242 horsepower to the wheels instantly.

BMW partnered with Toyota in 2013 to more quickly co-develop a mass-market FCEV, but has been working itself on hydrogen technology for the past 15 years. The automaker was largely quiet when it came to system specs, but did say its hydrogen fuel cell cars would take about the same time to refuel as a gasoline vehicle.