The problem is in power transmission. Transmission fee is a big part of the cost. Anything helping for at home generation should be encouraged.

Right now plug in solar is starting to appear. It is big in Germany. Utah has passed a law to cut the red tapes to allow home owners to install plug in solar themselves. More states should follow.

The rub is that people don't want transmission networks to go away. They just don't want to pay for the maintenance.

In many US municipalities the cost of infrastructure is rolled into the per unit fee meaning high consumers pay more. This works fine until folks adopt solar and their consumption goes negative.

The right answer is a connection fee based on the cost to maintain your hookup to the grid.