$PLUG About the only surprise in Plug Power’s secondary offering is that it took so long to occur. The company’s share price had doubled by late June and had tripled just a week later. By early August shares had quadrupled, and by early October were up by a factor of more than five. Plug Power has big plans. By the middle of next year, the company plans to be operating a 1.5-gigawatt capacity plant to produce its fuel cells. It recently hired a managing director in Europe where hydrogen fuel cell technology is expected to command €65 billion in new investment by 2030.