The reason why the energy lobby (and its pocket puppets) do not want this phrasing is this will automatically make our best beloved utilities obliged to hook-up spare microgeneration capacity - aka the German scenario.

It is not the big off-shore windfarms they are concerned about, it is Joe-average luser selling back energy to the grid. The utilities in the UK do not have the infrastructure and backoffice processing to handle this and they are desperately doing anything they can to make sure they look "Green" without allowing this.

Just try to call the British Gas solar helplines and see what I mean.