Answer: finding out the best place to build a solar power plant.
Step-by-step explanation:
The excerpt has already established that governments are aware of the benefits of solar power and that the Mojave desert is the best place in the United States to build a solar power installation. But there´s already one there, actually the largest one in the world. To build a new solar power plant, the Mojave Desert could be a possible location, but there´s no need to visit it to know that. Furthermore, other locations, even abroad, could be considered based on how much sunlight they get.