BMW quietly revealed a 5 Series GT concept earlier this week at an event in France, and it sports a plug-in hybrid powertrain capable of a whopping 670 horsepower. That's right, a hybrid BMW hatch-crossover with more estimated power than the 2015 Chevrolet Corvette Z06.

BMW's setup is called "Power eDrive," and it uses a 20-kilowatt-hour lithium-ion battery pack that provides juice for two electric motors; they work with a 2.0-liter turbocharged four-cylinder engine. This 5 Series GT would be able to travel for 62 miles under electric power.

The prototype shows the high-performance potential of the system, but the 5 Series GT is "purely a concept," BMW spokesman Julian Arguelles told Autoblog.

The GT made its global debut alongside plug-in versions of the 3 Series and X5. They used more basic eDrive systems with one electric motor teamed with a turbo four cylinder.

BMW revealed the prototypes to illustrate its plans to increase production of plug-in hybrids. Its goal is to add plug-in variants to all of its "core-brand models," though specifics and timing are unclear.