Your hard-earned gas money at work

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How much just to look at a picture of it?

That same nuclear plant can be used to power EVs from the grid. Personally, I think directly piping the electrical energy into a car's batteries or capacitors would give better overall efficiency than using it to make hydrogen, physically shipping it to the consumer, and then using it to make electrical energy in a car's fuel cell.

Don't get my wrong, hydrogen fuel cells are a neat idea, I just don't think their technical issues will be resolved before other alternative energy solutions become practical. Of those solutions, the one that seems to show the most promise at the moment is battery or capacitor operated electric vehicles.

One of the best solutions I have heard of is the use of renewable sources, such as solar and wind, to power the grid while at the same time using a portion of the power to charge hydrogen fuel cells that can pick up the slack when sunlight is diminished or wind is lacking.

I agree that battery powered vehicles are a better alternative then hydrogen for many of the reasons listed above. Which is probably why we see some of the former and really nothing of the latter in the consumer market. Except I have heard that a major drawback to the electric cars is that their batteries need to be replaced every two to three years at a cost of $10,000-$20,000.

Hydrogen is a gas at atmospheric pressure anywhere near room temperature, it is obviously far more volatile than a liquid fuel. As has been mentioned, it is explosive in a large range of pressures, produces an invisible flame and its combustion is extremely exothermic. Liquid hydrocarbons are nowhere near as dangerous as hydrogen in terms of combustion, explosions, and are much cheaper to store. It is also more problematic to keep hydrogen sealed, pump it around, etc than heavier gases like nitrogen.

Liquefying hydrogen requires either very large pressures or very low temperatures, both of which are expensive and have dangers of their own.

Yep, until someone comes up with a viable electric jet engine, jet powered aircraft will have to burn something to move. Many of the distribution issues with hydrogen would be less important with the streamlined pipeline from production plant to airport storage depot to aircraft. What could pose an issue is finding a way to store enough of it to give the plane appropriate range without taking up too much space (hydrogen has less energy density by volume than jet fuel) or adding too much weight (hydrogen storage containers have to be robust to contain the high pressure of their contents, and are thus heavier than your standard jet fuel tank). The primary impetus for this kind of development would be to divorce air travel from having to rely on increasingly pricey fossil fuels, so airplane manufacturers and airlines might be willing to put up with some loss of range or passenger capacity if it means remaining solvent.

Prop planes still get a lot of use in air travel, though, because they're more fuel efficient, can be operated from smaller airports, and tend to come in smaller sizes useful for regional transport. I think this segment of the market will benefit should anyone manage to adapt an EV drivetrain to an aircraft. Most private airplanes are prop-driven for many of the same reasons, and would also benefit.

Okay, now I'm confused. Zepplins were able to fly just by storing hydrogen. In the right storage conditions, wouldn't hydrogen actually make the plane lighter? I'm sorry if this is a stupid question.

Not really, Speckles. If you look at dirigibles, balloons, and blimps, you'll see that the volume of gas used to lift the aircraft is massive relative to what's being lifted (the Hindenburg was basically a series of massive gas bladders with a small passenger cabin mounted at the bottom. Hydrogen stored in a passenger jet for use as fuel would be compressed (and made many times more dense) to fit in the streamlined aircraft body to allow for high-speed flight, making it denser than air, and not contributing to the aircraft's lift.