Far more mileage in "Meso" community projects on a neighbourhood and area (multiple neighbourhoods) scale basis, I think, both in terms of renewable energy generation, and in retrofitting energy efficiency (Negawatt) measures.

But the boundary of Micro and Meso is grey. Of course, there could be some big wins in urban distribution of hot water from current plant by "CHP'ing" them, although the current distribution of UK generation doesn't give that much opportunity.

"Any economic unit can emit money. The serious problem is to get it accepted" Hyman Minsky