I understand the problem is transmission much more than generation. There's a backlog of power sources waiting to come online for infrastructure to catch up. Or so I heard.
I believe it was an episode of the podcast "Shift Key". Season 2, episode 5 is called "A Beginner's Guide to the Interconnection Queue". The hosts talk to some industry people who present the case. They say that there practical reasons why the interconnection queue is slowing down renewable generation deployment significantly.
I don't know if this podcast presents a balanced view, but it sounds convincing to me.