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My wife and I have driven RAV4 EVs (pure electric vehicles) since
2001.  About 2/3 of our overall driving has been in these
vehicles.  About 1/3 of our overall driving occurs in a
gasoline-powered minivan, which we primarily drive when we go long
distances or need to carry more passengers than the RAV4 EV can
carry.  If our minivan was a plug-in hybrid vehicle, then perhaps
90% of our driving would be using electricity, dramatically
lowering our need for gasoline.

It is clear that fuel cell technologies have not arrived.  Like
Charlie Brown with that football, using fuel cells in cars is a
concept we've been promised for years, and will continue to be
promised for years.

As Felix Kramer says, electric cars and plug-in hybrid vehicles
are the only vehicles that get cleaner over time, precisely
because the grid gets cleaner.

And we know that electric cars fueled with coal-fired electricity
are still cleaner on a well-to-wheel analysis than
gasoline-powered vehicles.  This is especially true with the
California electrical grid, which is much cleaner than the
national average.

About 15 million plug-in vehicles (plug-in hybrids or battery
electric vehicles) could be charged overnight without adding a
single power plant.

So my recommendation is to change the ZEV mandate to eliminate
credits for experimental fuel cells, and set a mandate for zero
emission vehicles, like battery-electric vehicles with some
credits given for plug-in hybrid electric vehicles, like the Prius
conversions or the proposed Chevy Volt.