I have done work with a large industrial plant that wants to be able to connect its local generation to the grid in order to supplement what it gets from the grid. The amount of permitting and everything required is surprising. Unfortunately, there are legitimate concerns about putting extra sources of electricity onto the grid. Hypothetically speaking, if poorly engineered sources of energy were placed on to the grid en masse, it has a potential to cause problems that ultimately bring down the entire grid in ways that make it quite difficult for the grid to come back up. Effectively, you can say that the electric grid is not just a big truck that you can stack more power on, there are a number of precise things that need to be done right, and if they aren't things get really bad really fast. This isn't related to that, but earlier this year there was a major grid collapse in Spain that almost turned into an even bigger collapse, and that was just related to conventional renewables rather than a bunch of individual households connecting to the grid.