Actually this is not as bad and trivial as one could expect. it is NOT about oil and gas production but rather than about reprocessing oil waste.
Al-tough I like the idea, I do not trust them at least , not now. They say that they have working technology and contract. This means that they should have had a team and company before this ICO , I do not see the proof.
Its possible to sell power to the grid here in the US, and I can imagine its possible in most all countries; but that doesnt make it a decentralized grid, it just makes you one of the power companys freelance suppliers.
In order to implant one of these systems youd need your own physical grid uncontrolled by any power company, which is probably the biggest roadblock of any plans to build a decentralized power grid.
What systems you mean? It seems that you are talking about Absolutely autonomous grid of house holds. This is not the point nor this is possible since most of the population lives in big apartment buildings and nor it is needed since grid is usefull in scenario where you can give energy to those who needs it when you dont. And if you think of batteries,, they are vey, very expensive thing to have if you want to be autonomous.