Trina Solar (NYSE: TSL) recently posted its first profit in nine quarters but the 700% rally in its shares in just one year is alarming (this was a $2 stock last year). Earnings were fantastic for Trina, but could competition hurt future growth? The company has been helped by a bigger presence in Europe thanks to trade agreements with China and stronger margins from Japan. While many were focused on Trina's earnings, First Solar (FSLR 8.70%) quietly upped its investment to operate solar power plants in Japan, a move I feel should have Trina looking over its shoulders. Also, First Solar's new relationship with General Electric (GE 0.99%) forged in August can't be overlooked, especially with access to General Electric's sales force as part of deal that could present more synergistic opportunities for both parties than was assumed when the partnership was first announced.