In answer to marcel_g I would point out that FCEVs ARE viable already. Two models are already available in your country, and are selling rather better than many plug-ins despite their high cost and the fact that your whole country has only 30 or 40 hydrogen filling stations. Germany - a far smaller country - has twice that number of filling stations and will have around 400 by 2023. I don't see infrastructure being a show stopper. Far less so than charging points because you need far less of them. I don't accept that efficiency is very important to the consumer. After all, almost 99 out of a hundred people prefer to buy ICEs which are the least efficient of the lot! Worse than batteries AND hydrogen! I suspect convenience is far more important, and batteries are certainly not that! As to the production of hydrogen, I suspect that given time it will all come from electrolysis, not methane. Why? Because it is a convenient way of putting excess renewable power to use. In order to get most of your electricity from - say - wind, you have to over-provide in terms of peak power. Basically, you get about 40% of whats on the nameplate so if you aim to get 50% of a years electricity from wind, you will have to install 50% more than you need. This means periods when you have far more power than you need, and the result is wind farms are often shut down in windy conditions. The electricity they provide could be usefully put to work in electrolysing tapwater. Moreover, if you are fortunate enough to live in a sunny climate and have a large roof space, you can produce the hydrogen yourself. Electrolysis is such a simple process it is perfectly feasible to have a home filling station. You need a high-pressure compressor and tank, but that in mass production is no great deal. The result is free power without the hassle of plugging in every night. You fill up when you need it, just like you do with an ICE. It is worth noting, too, that a very large number of people live in houses or apartments where it is not possible to 'home charge' their cars. Battery vehicles are a huge no-no for these folk. I think that EV enthusiasts have to accept that their enthusiasm is not shared by the general public. People, in general, have not and are not buying them, despite a wide range of models being available. I am pretty sure the reason is the battery. It is just too much hassle. Time perhaps to see hydrogen, not as an obstacle to the adoption of EVs but a route to it.