And it's not so much "NIMBY" as a genuine land cost issue. We could do well to expand rooftop solar on large buildings, though.
In extreme heat they are 25% less efficient.
Transmission over long distances is not lossless.
Keeping them clean is maintenance. All forms of generation have maintenance requirements.
What is the cost of extra panels to overcome transimission losses? How does that compare to buying fuel at a more local plant?
How much does keeping solar panels clean cost? How does that compare to keeping a gas turbine running?
The hitch is the people that can make such cables have a long back order list.