From power plant? Using fossils?Not really. There are off peak power cycles in 24 hr from power plant, using the off peak to produ e hydrogen can be very viable
Efficiencies of typical power plant are about 30% (I'm being generous here).
Conversion from electricity to split and then compress the hydrogen loses another 20%.
Then you got to keep that hydrogen cold for storage and that is another 5%.
Which means you only get 5% of the energy given out by burning that fossil.
This hasn't taken into account the mind boggling logistics of moving hydrogen around and the fact that you're back to fossils.
Compare that to just burning gasoline which gets you about 15% usable energy in the car.
Or purely electric which I figure gets 50% of sunlight/renewable energy turned into usable moving the car.
Hydrogen is DOA.