On the sell side, Travis sees a lot of risk in Yingli Green Energy's (NYSE: YGE ) $2.8 billion in debt, which will put it behind as the next generation of solar equipment rolls out. Again, Yingli has jumped this year but unlike SunPower it has yet to make a profit. http://www.fool.com/investing/general/2013/10/10/solar-stocks-buy-sell-and-hold.aspx