I had a nuclear engineer describe it to me this way. Nuclear power stations for the grid's base load, step it up a few extra levels and use the extra power to crack hydrogen. Use that hydrogen to run turbines for the grid's variable load and produce enough of an excess to be able to sell it to fuel cars. It will require a lot of nuclear reactors, but completely replaces our dependence on fuels which may run out at some point and if the ecomentalists ever get over their fear of nuclear power, will solve what they see as the poisoning of the atmosphere. Except for the fissionable materials, the entire process is renewable and leaves no pollution, and if those fastbreed(I think) reactors which can run on spent fuel rods work as designed, we wouldn't have much of a containment issue either.