The guys working with Utilities already are the ones from the PROSUME.io ICO.
They already have projects running ion building microcommunities with various European Utilities as well as a large project with a Transmission System Operator.

The problems with peer to peer transactions energy transactions are of two main origins.
1. legal limitations for a non utility related energy producer to sell against value to another common citizen
2. transmission and distribution costs to be paid to the Grid Operator.

Prosume has solved both these points in order to build a very strong business case from day one.