Energy package 3 was supposed to fix this with some additional regulation and standardization. It did not. Energy package 4 is supposed to fix this with more standardization and regulations (including distributed generation; which I am in favor of btw.) however, it will not.
The problem is the privatizations of the 2000s, not in the regulations surrounding small scale solar. The problem is neo-liberalism. Get rid of corporations rent-seeking on our infrastructure. Our energy bills will not become lower until then.