Very interesting article, I had no idea that this was going on up there. One of the things that has been discussed in the wider energy mix debate in the UK is the need for multiple implementations of projects like this, as we do have a huge amount of coastline, and more potential wind energy that the rest of Europe combined (apparently). Problem will always be an political-economic one - does central government plan and fund directly, or is this going to need regional planning and implementation on a multiple, small scale basis.
I would assume that the Orkney project involves local budgets with some central subsidy, an array of supplier contractors, and a very strong oversight... the latter being the most difficult from what I have experienced.
Clearly beneficial to produce hydrogen locally, rather than transport it from afar for end use - but the large national grid in the UK does mitigate the electricity transportation problem - so it at least doesn't have to consider that part as much.
Great thing for Orkney is the Hydrogen storage could greatly help with load balancing energy demand, which is a large problem for them, but less so for a substantial grid feeding in from multiple production types. Where they are, I doubt solar would be that efficient.