On Monday, Q-Cells announced it is terminating a long-term supply agreement with the company. Other worst performers included advanced materials producer Rubicon Technology (RBCN), falling 9.66 percent; energy storage and power delivery system maker Maxwell Technologies (MXWL - Get Report), losing 8.09 percent; lithium battery maker China BAK Battery (CBAK - Get Report), down 5.17 percent; and developer of advanced energy delivery technology American Superconductor (AMSC - Get Report), losing 4.89 percent.
QWND -- up 1.89 last week -- includes companies that are primarily manufacturers, developers, distributors, installers, and users of energy derived from wind sources. QWND's 24 pure-play components were evenly split, with 12 seeing gains and 12 losing ground.
QWND's best performer for the week was wind turbine gearbox maker Hansen Transmissions Intertnational (HSN), gaining 9.38 percent.
Other top performers included composite materials producer Gurit Holding (GUR), climbing 5.81 percent; turbine manufacturer Vestas Wind Systems (VWS), up 5.23 percent; Australia-based wind farm owner Infigen Energy (IFN), growing 5.21%; and project developer Iberdrola Renovables (IBR), rising 4.95%.QWND's worst performers were wind farm operator Terna Energy (TENERGY), down 4.92 percent; American Superconductor (AMSC - Get Report), losing 4.89 percent; wind turbine manufacturer Clipper Windpower (CWP), falling 3.17 percent; wind farm operator Japan Wind Development (2766), down 3.06 percent; and carbon fiber maker Zoltek Companies (ZOLT), declining 2.69 percent. QGRD -- up 2.63 percent last week -- is composed of companies that are primarily involved in the electric grid; electric meters, devices, and networks; energy storage and management; and enabling software used by the smart grid and electric infrastructure sector. Last week, 10 pure play QGRD components saw gains and 7 lost ground. QGRD's best performer was EnerNOC, gaining 12.22 percent. Rounding out the top five performers were power conversion device maker Power-One (PWER), rising 12 percent; energy demand management company Comverge (COMV), up 9.11 percent; transformer manufacturer Jinpan International (JST), climbing 8.17 percent; and developer of energy data systems ESCO Technologies (ESE), growing 5.91 percent.