Plug Power, Down 49% in 12 Months, Still Isn't a Buy

NEW YORK (TheStreet) -- With its shares down 7.8% in 2015 and nearly 49% in the past 12 months, Plug Power  , a manufacturer of fuel cell systems, has had a tough time turning its potential into actual cash. Fuel cells and other forms of alternative energy interest investors lately, but it's tough to ignore the punishment Plug Power shareholders have suffered. Plug Power, headquartered in Latham, N.Y., makes fuel-cell systems -- the type that powers forklifts used to move warehouse goods. One ...