Hi PhysicsForums, I'm asking this as part of a small research project of mine in exploring hydrogen as an alternative energy source to fossil fuels. Based on my limited understanding, hydrogen is a good alternative to fossil fuels (especially in cars) because the only waste product is water. However, the main problem is that obtaining hydrogen presently involves extraction from natural gas (a form of fossil fuel so it kind of defeats the purpose). I was looking at the possibility of obtaining hydrogen from electrolysis, which uses electricity that again comes from fossil fuel power plants. Some sources I've come across suggest that we can carry out the electrolysis of water using renewable energy sources like wind/nuclear/hydro. Here is my question: since electricity is needed to break water down into H2 and O2, is it not wiser to just use that electricity obtained from wind/nuclear/hydro to directly power an electric car and bypass the electrolysis/hydrogen fuel cell completely? The reasons I can think of are: 1. recharging an electric car takes time while refueling hydrogen is quick, akin to traditional refueling 2. its more difficult to store and transport electricity (needs a battery I presume) than it is for hydrogen gas. Do note that this is only a hypothetical research writeup for a module of mine (I don't actually have to carry out the research, and the idea need not actually really be feasible. This module focuses more on the process of idea generation and report writing etc), so I'm just assuming theoretically if obtaining hydrogen from electrolysis of water using renewable energy sources is feasible, which sounds great since water is abundant and renewable energy is well, renewable. Thank you for your time!