Thanks for sharing the information. However, most of the information is from 2006. Do you have any update? I heard that producing pure polysilicon will consume a lot of electricity, which will not be compensated until more than 5 years of solar cell's output of electricity. In other words, one need to pollute the air first and then wait a long time before there is real green energy effect. That sounds terrible! There must be a better way to produce real green energy.