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What's interesting:
You can isolate & store hydrogen using renewable electricity, so technically more "cleaner" electricity coming online is no reason to shift from H fuel cells to battery electric vehicles (BEVs).
It ignores the fact that the BEV is a more energy efficient use of that electricity in the first place, but fuel cell proponents like that tech for other advantages (faster filling, range).
I saw a reference recently that it would cost a trillion dollars to put hydrogen in all the gas stations in the U.S. Maybe the reality of that chicken & egg scenario is the real reason for the shift in focus. Whereas PHEV's with moderately sized packs can easily be re-charged from ubiquitous 110v outlets (eg. current Chevy Volt = 8 hours from completely empty; other PHEV's take less time than that).
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