Not only is the LMP1 class set for a radical overhaul at Le Mans with hypercars taking their place, but the Automobile Club de l’Ouest (ACO) wants to see hydrogen-powered vehicles competing in the world’s most famous endurance racing.

During the Spa 4 Hours race last weekend, the ACO ran a series of demonstration laps in an LMP3-based prototype that’s powered exclusively by hydrogen.

The vehicle, dubbed the LMPH2G, utilizes a four-stack fuel cell and four electric motors to deliver a combined 653 hp and allow for a respectable 186 mph (300 km/h) top speed.

The vehicle in question was developed by GreenGT and driven by four-time Le Mans winner Yannick Dalmas during its demonstration lap.

“We had no hesitation in joining the ACO on Mission H24,” GreenGT chief executive Jean-Michel Bouresche said.

“We have been convinced about the potential of hydrogen for several years now and have developed sound experience and recognized expertise in the field. Speeding up the research process via motorsport is a challenge that we are enthusiastically – but realistically – ready to accept.”

GreenGT will continue to develop its hydrogen powertrains through the development and production of the H2 Speed hypercar. Unveiled as a concept car two and a half years ago, the H2 Speed is derived from a Le Mans prototype chassis but has a longer wheelbase and narrower track. GreenGT says it delivers 653 hp, just like the LMPH2G, and rockets to 62 mph (100 km/h) in 3.4 seconds before topping out at 186 mph (300 km/h).