We definitely need to be careful to not ruin desert ecology, but we should be moving forward with solar farms in these regions whenever possible. The Mojave is currently being “mined” for its rays. From Mark Strauss at the Smithsonian:

“The Mojave Desert is blooming. Construction crews are erecting mirrors —each measuring 70 square feet—at a rate of 500 per day across some 3,500 acres. When completed in late 2013, the $2.2 billion Ivanpah Solar Electric Generating System—the largest of its type in the world—will power 140,000 California homes.

Unlike photovoltaic technology, which converts solar radiation directly into electricity, the Ivanpah facility generates heat. More than 170,000 mirrors will gather tremendous amounts of sunlight and focus it on three towers filled with water, raising temperatures to more than 1,000 degrees Fahrenheit and producing steam that spins turbines that generate electricity. The Oakland-based company BrightSource Energy, which is overseeing construction by the Bechtel corporation, says that using sunlight instead of fossil fuels to power the turbines will reduce carbon emissions by more than 400,000 tons annually. The desert region—thanks to its elevation and clear, dry air—receives reliable sunlight 330 to 350 days per year.”