Ironically Colorado is a very hard partner to trade with. The major consumer (Denver) is in the center of the state. The entire eastern half is an empty plain and the western half of Kansas is a slightly less empty plain. From population center Kansas City to Denver is about 600miles, make energy trade a little impractical. They make a ton of their own wind energy on their open plain, and they were late adopters; they learned a lot from Kansas's expensive mistakes on wind power.
If land is not overly expensive, then vertical bifacial solar can be quite viable. With snow or a light non-vegetated surface you should expect around 15% capacity factor in the worst month at 40 degrees and it will be skewed heavily towards morning/evening and slightly toward cloudy days compared to monofacial.
Doesn't get rid of the fossil fuels on its own, but should be cheap enough to displace most coal that remains after wind at a significant profit.