Right now it is in Germany but China plans to build the largest solar Power Station soon. According to this article, China's plan is to put up a 100 MW power facility. China really is putting up a good Renewable Energy fight, as it is now putting up large ethanol factories from sugarcane.

This is certainly a good and welcome development; after all, with all the industrialization that is happening in China, they ought to be doing this. According to experts, they will overtake the US in total carbon dioxide emissions by 2009 and cleaning their act now should contribute to reducing that.