The restrictions are DOT I remember remember correctly.
As I mentioned before hydrogen needs special consideration for storage, pumping and handling.
Fuel cells demand hydrogen as fuel. Other than that in a generating plant there is little need for it. it's when hydrogen gets got, it becomes Mr. Hyde. Impinged piping and vessels in an oil refinery requires periodic nuclear x-rays. I saw and heard a nickel size hole in lube hydrotreater line, ignite and blow one inch thick slabs of concrete over a 20' x 30' area get ripped from the plant's pad. Scary.
