If you take solar arrays as an example, someone needs to do the build out. That someone is likely to be a local or regional company that hires local workers. Planning and construction accounts for a significant fraction of project costs as materials costs have plummeted, so this is money that ends up being recirculated in the local economy. Of course there will be large companies in the mix, but there won't be a network effect that results in one company owning the whole industry like Facebook, which is a good thing.
That doesn't make much sense. A good comparison would be to look at big Telecom. A handful of large companies both build out the infrastructure and then sell their services to the public. Why would building energy infrastructure be any different?
