mark mobley paid 50,000 euros to buy one of the first hydrogen cars for sale. >> it is quiet.re very few moving parts. fast acceleration like that, but that was with hydrogen. reporter: the state has 10,000 fuel-cell cars on the road, making it the second largest hydrogen fleet in the world. to refuel, drivers must go to specially equipped service stations. they are spread out across california. it is not gas or diesel, but hydrogen. pump time is 10 minutes, four times less than an average electric recharge. >> i rent an apartment and don't own a home. the hydrogen is more convenient because i cannot charge a plug-in electric vehicle at my apartment. reporter: he can drive nearly five in a columbus with a full tank, but the price remains expensive. >> it is $16 per kilogram 16 times five, $80. reporter: california is home to 90% of the hydrogen stations in the u.s., but despite many more under construction, there are not enough to meet demand. >> something i noticed this morning is i did not get a fulfill -- full fill. does the machinery no winter ration? >> yes, we will see s