I don't know if that's true. It's important to consider that most of the state is US government owned (military, national park, national forest). A large portion of the rest is used for mining which is, I think, still the largest industry in the state, employing a formidable share of workers and fueling related industries (trucking, concrete, gravel, salt, etc.).
Combined, these put a strain on land as a resource, and solar is the one energy source that demands that same resource the most.
Leasing land for solar pays very little. The only reason people do it is because the land has no better use and solar doesn’t permanently damage it the way mining or farming could. Other industries aren’t being priced out.
The USA is one of the largest countries by landmass on the planet. We are not short on space anywhere in any capacity except immediately surrounding major cities.
This is an opportunity to bring dollars and jobs to their state and the only reason they're resistant is to stick with party lines.