Reuters: Solar energy stocks fell for the fourth straight day on Wednesday as investors worried that the recent pullback in oil prices and a weakening U.S. economy could hurt domestic demand for alternative energy sources. Shares of First Solar Inc (FSLR.O: Quote, Profile, Research) slid 7.6 percent at $213.02, while SunTech Power Holdings Co Ltd (STP.N: Quote, Profile, Research) tumbled 12.6 percent to $66.13, and SunPower Corp (SPWR.O: Quote, Profile, Research) slumped 8.7 percent to …