Bloomberg : “Solar power might become the world’s largest source of electricity by 2050 as falling costs boost installations, according to the International Energy Agency.”  

“Photovoltaic plants may provide as much as 16 percent of global electricity, and concentrating solar facilities could generate another 11 percent, the IEA said in an e-mailed statement today.”  

“Photovoltaic installations have grown much faster than the agency expected when it released its first outlook for solar in 2010, when it saw them covering 11 percent of global power by 2050.”  

“The cost of electricity from photovoltaic projects will fall by an average 25 percent by 2020, 45 percent by 2030 and 65 percent by 2050 … This implies a levelized cost of power of as little as $56 a megawatt-hour for large plants and $78 on rooftops.”  

The Guardian : “The IEA said PV expansion would be led by China, followed by the United States, while [solar thermal electricity] could also grow in the United States along with Africa, India and the Middle East.”