wyoming and montana were on my list of places to drive through this summer. I'm sure they are beautiful... but maybe you should also consider Texas. I'm not even from Texas, but it really has grown on me. 

Texas has its own electrical grid, and it's close enough to Colorado that you could drive overnight up there.  There are 2 hub airports for United and American Airlines plus we are a short bus ride/drive from Monterrey, Mexico with all of the Mexico destinations. 

There's the ports along the Gulf Coast, and fertile gulf coastal plains. and then there is the Hill Country with it's cold fresh water springs in the middle of the state. Beautiful deserts to the west, and acres and acres of plateau farmland to the Northwest.

It's also very windy here, tons of windmills everywhere. It's just a hot wind from June to October, but you could drive up to New Mexico or Colorado for a break.

Maybe put Texas in your evaluation matrix...