GM has predicted that by 2025 over 50% of the automobiles in North America will powered by fuel cells. Apparently by day they are transportation and at night they are little power plants. It is also said that if you get in on it early, you will pay less for the hydrogen and you will be able to sell back your extra energy to the grid. Meanwhile, those that come along later, will be
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Diana

Hydrogen is the most abundant substance in the Universe, and sny high school kit in a chemistra lab can extract hydrogen from plain water. Water is H2O 2 molucules of hydrogen bomded to one molecule of Oxygen.

Now to your second point. If you generate more energy that you need; you can sell the extra energy to the electric plant; but you will only be paid for the energy at the wholesale rate.

Two Bears