Average US consumer costs are $70/MWh for transmission [1], out of $130/MWh total averaged across all consumer types [2].
However, those are average prices, residential consumers pay far higher prices, especially for the T&D side.
New utility scale solar is $38-$78/MWh unsubsidized [3, page 8], at $1.15-$1.6/W. [3, page 34].
Meanwhile, residential solar is $2.5/W to $3.5/W [4], meaning it's only twice as expensive as utility scale solar. All told, that means that residential solar cost is roughly equal to the cost of utility scale + T&D. (While searching the web, several results claimed that residential solar typically costs $0.06-$0.10/kWh, or $60-$100/MWh, but that seems too low, and I'm guessing is from old data when it was cheaper to residential builds...)
All this ignores storage, etc. But residential solar shaves off the highest peak of demand from air conditioning on the hottest days, so every time I see a neighbor install solar I cheer because I know that it's less justification for the utility to build out more T&D for the rest of the power needs.
[1] https://thundersaidenergy.com/downloads/us-electric-utilitie...
[2] https://www.eia.gov/electricity/monthly/epm_table_grapher.ph...
[3] Main report PDF at https://www.lazard.com/news-announcements/lazard-releases-20...
[4] many sources, this hasn't changed much in years, one random top web hit is here: https://www.ecoflow.com/us/blog/california-solar-panel-costs...