Seen a couple like that over the last few years. Never seems to happen (They can't make enough Hydrogen fast enough with the size of the rig and excess power they can generate).
Who knows if they overcame those obstacles???
However I would love to experiment if I had time and $$$, cuz I love to do that kind of thing!
By the way the cost of water is going up very fast around here (Propose 61% starting now and up to 191% increase in 10 years). Another townhall meeting Monday.