You are obviously correct except for the expense part. They have electricity even in pretty remote places there. In addition wind and solar power are both easy to do there also. Don't forget that nearly 10% of Texas power comes from West Texas wind, according to the Dallas Morning News.
It's not electricity, it's volume. Capital has cost, and facilities require maintenance. If a DCFC station services 100 cars a day, it uses the capital more effectively than if it services 10 cars a day.
If you must support charging 1 million EVs nationally, you get more bang for your buck when they are closer to urban areas. Hence the most expensive facilities are the ones that pump the least amount of miles per day into cars.
I would venture a guess this is why you see neither SuperChargers nor CHAdeMO nor CCS in West Texas. It's not because it's not critical route, it's because they can service more cars with the same investment elsewhere.
This is simply because there are not enough long range EV trips yet. The cars are available today because of Tesla and Tesla alone, but not in sufficient numbers so that the small portion of interstate travelers with these cars makes remote locations as economical as other routes.
It's the same reason jet routes, train routes, bus routes, need to charge more for remote locations, and the # of departures is low.
You must hand it to Tesla Motors, they completed a coast to coast route sooner than CHAdeMO and CCS. I assume they will cover the 10 at some point, but the expansion sure would go faster if they would monetize the EV grid. This would subsidize the remote location higher capital costs.
