The solar market is back on its feet again after a rough few years dealing with oversupply. The Japanese market is booming and U.S. residential installations are steadily growing. SunPower (NASDAQ:SPWR) and Canadian Solar (NASDAQ:CSIQ) have already reported better than expected earnings, while Trina Solar (NYSE:TSL) and Yingli Green Energy (NYSE:YGE) have already raised guidance. But not all solar companies are enjoying the boom, as exemplified by First Solar's (NASDAQ:FSLR) struggles. Motley Fool contributor Travis Hoium covers the trends that investors should look for in the video below. 

Fool contributor Travis Hoium owns shares of SunPower and SunPower. Travis Hoium has the following options: long January 2015 $5 calls on SunPower, long January 2015 $7 calls on SunPower, long January 2015 $15 calls on SunPower, long January 2015 $25 calls on SunPower, and long January 2015 $40 calls on SunPower. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.