Solar stocks rack up a second straight day of big gains following Berkshire's $2B-$2.5B purchase of SunPower's (SPWR +29.8%) Antelope Valley projects and Lazard's subsequent upgrade. First Solar (FSLR +6.5%) enjoys an upgrade too, but it's faint praise; S&P Capital IQ lifts FSLR to Sell from Strong Sell. TSL +16.7%, STP +10.6%, LDK +14.5%, YGE +11.3%.