Plug Power says sees overall growth in revenue, profitability in 2015 Says expects to achieve nearly 30% gross margin in GenDrive business by end of 2015. Sees shipping over 3,300 GenDrive units in 2015. Sees sequential improvement in margins throughout the year. Says overall gross margin rates "moving in the right direction." Sees overall growth in revenue, profitability in 2015. Plug Power is up 4.12% to $2.53 in morning trading.