Las Vegas could eventually generate a significant fraction of its energy needs from solar, but few other cities in the U.S. would be able to duplicate it, so it isn’t much of a “model” for others.
This whole argument is stupid. They have been renewable from the time the hydro-electric generators at Hoover Dam went online in 1936. All they need is an ample supply of water to keep it going. That has been an issue for some time as the drought in California has also affected the snow base in the Rockies which also feeds Hoover and Glen Canyon.
Now, for going solar or wind, one could deduce that could augment the normal outputs of the dam, but every time I have been there, I have never seen all of them (17) being used at the same time and usually only about half are turning. There are 9 on the Arizona side and 8 on the Nevada along with the baby ones (2) that were originally used to bring up power when first built and now to supply power for the dam oprerations.