Utility-scale solar and residential solar aren’t comparable on a levelized cost basis, because only one delivers power at the point of use (residential solar).
Utility-scale solar has to get to customers, and that getting requires access to (and often construction of) high-voltage transmission infrastructure that is not only controversial, but expensive. The chart, based on Clean Coalition analysis in 2011, shows that transmission costs for large-scale solar projects can outweigh economies of scale from being big.