I think blockchain tech. will change the way how the solar energy will be used. At the moment it looks like that when you are providing solar energy to an electricity company the latest becomes a retailer a set a margin on the price to send it to an end consumer which could be a direct neighbour of the actual provider.
With blockchain the intermediate would be eliminated and the energy could be directly sold from P2P.
Also in the medical sector it could make a lot of sense.