My landlord said it was the energy corps that were against it. The tech is so simple that you could run it at your home with a small solar panel.
Don't know if he was right.
From memory, splitting water into Hydrogen and oxygen via electrolysis, only to be converted back to electricity is very lossy. I believe that most hydrogen generated at industrial scale is derived from fossil fuels.
Storage is also very difficult. Hydrogen is so small it can squeeze through a lot of gaps, making it hard to contain. You probably have to store it at high pressure and at cryogenic temperatures.