Others are also showing an interest, albeit with a dose of scepticism thrown in.
Last year, Volkswagen filed a patent for a new hydrogen fuel cell system with a 1,243 mile range, using cheaper ceramic components when compared to the polymers used by Toyota and Hyundai.
But in February, Volkswagen brand boss Thomas Schafer said for the next decade at least, hydrogen was not a cost-effective option.
Ford and Stellantis, which owns brands from Vauxhall to Citroen, have focused their hydrogen efforts on vans as a diesel alternative, and for most vehicle makers, the gas is seen as a good bet for heavier vehicles like vans, trucks and heavy goods vehicles.
While hydrogen cars seem like an ideal solution for caravan owners, sales reps and city dwellers, to be carbon-free they must use gas made by renewable electricity, using the current to split water molecules into hydrogen and oxygen.
This extra step means the fuel will always be more expensive than electricity itself, which can be used to directly charge a battery car.
The X5’s 6kg hydrogen tank costs about £120 to fill, offering a range of about 310 miles, for a price today of about 39 pence per mile.
It also puts drivers in competition with industries which have few other options, especially in the near term since green hydrogen is expensive to make and has very limited capacity today.
Steel, cement and glass makers and the aviation industry are all clamouring for the gas since batteries and electricity are either too heavy or do not generate the heat they need.
Sabine Klauke, chief technical officer at Airbus, said in an interview last month that industries which can use batteries should do so, leaving the limited feedstock supplies available for those with no alternative.
In an interview at the Paris Air Show, she said: “There are industries which are really difficult to decarbonize.
“So it would be far more helpful if the ones who can go electric, go electric.”
Others are more optimistic. Blake Scholl, founder of supersonic jet designer Boom Supersonic, is confident that huge demand for sustainable jet fuel, and the hydrogen it’s made from, will mean an explosion of production.
He told a press conference last month: “Over time, as supply increases to catch up with demand, prices will fall. This happens in every market.”