Plug Power Inc. PLUG shares fell nearly 9% Tuesday in premarket trade after the fuel cell company revealed a bigger quarterly loss than analysts had predicted. The company reported a net loss for the first quarter of $206.6m, or 35c per share. This compares to a loss in the previous quarter of $156.5m, or 27c per share. FactSet tracked analysts who were predicting a loss of 26 cents per share. Plug Power revealed in its shareholder letter in which it stated that the fuel margin was still under pressure during the last quarter due to “increased hydrogen molecule costs associated with historically high natural gas prices”.