The reason the focus is on desert is because of the economics of solar. Places like NJ, Oregon, Mass, and Germany are good examples of how solar will be used.
This Dept. of Energy brochure on Solar can be downloaded by clicking the link provided.
Myths about Solar ElectricityProduced for the U.S. Department of Energy by the National Renewable Energy Laboratory, a DOE national laboratory
DOE/GO-102003-1671 January 2003
http://www1.eere.energy.gov/solar/pdfs/32529.pdfThe area required for PV systems to supply the United States with its electricity is available now from parking lots, rooftops, and vacant land.Solar electric systems are an important part of the whole-building approach to constructing a better home or commercial building. Although these systems have delivered clean, reliable power for more than a decade, several myths have evolved that confuse the real issues of using solar electricity effectively.
Myth #1
Solar electricity cannot contribute a significant fraction of the nation’s electricity needs.Solar electric panels can meet electricity demand on any scale, from a single home to a large city. There is plenty of energy in the sunlight shining on all parts of our nation to generate the electricity we need. For example, with today’s commercial systems, the solar energy resource in a 100-by-100-mile area of Nevada could supply the United States with all of its electricity. If these systems were distributed to the
50 states, the land required from each state would be an area of about 17 by 17 miles. This area is available now from parking lots, rooftops, and vacant land. In fact, 90% of America’s current electricity needs could be supplied with solar electric systems built on the estimated 5 million acres of abandoned industrial sites in our nation’s cities.
Myth #2
Solar electricity can do everything—right now!Myth #3
Producing solar electric systems creates pollution and uses more energy than the system can produce over its lifetime.Myth #4
Solar electric systems make sense in only a few applications.Solar electric systems make sense nearly anywhere electricity is needed. Homes and businesses that are already using electricity from the utility, such as homes, businesses, and electric-vehicle charging stations, represent nearly 60% of the market for solar electric systems. The number of these grid-connected applications is growing because they make sense economically, environmentally, and aesthetically. Solar electric systems make economic sense because they use free fuel from the sun and require little upkeep because they have no moving parts. Every bit of electricity produced is used in the home or sold back to the electric utility for use by other customers. Solar electric systems also make sense for the environment and can blend seamlessly into the design of a building.
Myth #5
Solar electric systems are unreliable and produce substandard electricity.Myth #6
It is difficult to make solar electric systems aesthetically pleasing and functional for homes and businesses.Produced for the U.S. Department of Energy by the National Renewable Energy Laboratory, a DOE national laboratory
DOE/GO-102003-1671 January 2003
http://www1.eere.energy.gov/solar/pdfs/32529.pdf