People that drive 'green' cars are inherently rewarded with paying few taxes at the pump, because they are buying less fuel. Though they may be using the roads and travel infrastructure (which are partially funded by gas taxes) as much as 'non-green' drivers..is this fair for all? Not really, but imagine the fallout of charging Prius drivers more per gallon in order to increase their contribution to the infrastructure that they're using.
In many places, people using solar energy ARE charged more per kilowatt, for the exact scenario above--Increase their contribution to the infrastructure they're using--which is the opposite of what you proposed.
In your proposal to punish the folks that haven't jumped on the solar power band wagon--who receives the benefit$ of their 'punishments'?