14. It's legitimate basic research, but not a breakthrough
It's claim to fame is that it reproduces photosynthesis with a process that looks capable of raising the efficiency to 15X what a plant could do.
They use direct sunlight to power the reaction, not electricity, so the process commences with the input of solar energy into the medium that delivers the captured energy as pure hydrogen - which is a different, sometimes more useful output than plant sugars.
The only criticism I'd offer is that the press release reinforces the meme that storage is a much larger problem than it actually is. There are a large array of technologies and approaches for dealing with variable sources of generation that we will be integrating into a distributed renewable energy system; this might well be one of them but there is no Holy Grail of storage required.