Are there any non-coal-driven power sources for these EVs?
You have to look closely in the text above.
... hydrogen fuel cell vehicles like the Mirai...
They offer a complementary $15,000.00 or one year supply of hydrogen with every purchase of the Mirai, but the filling stations are only in California.
The hydrogen is right now probably made from fossile fuels but...
Toyota is helping develop a “cow to car” fuel supply model in California. This innovative idea solves two problems if it works. It promises clean hydrogen and robust supply. Cows produce methane, a prominent greenhouse gas through belches, farts, and poop. But, methane is also a source of hydrogen.