The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.NEW YORK (
QWND's worst pure play performers were wind project developer Infigen Energy ( IFN), losing 14.29% ; wind turbine gear transmission provider China High Speed Transmission Equipment Group (0658), down 7.19% ; carbon fiber material developer Zoltek Companies (ZOLT), losing 7.02% ; wind turbine gearbox maker Hansen Transmission International (HSN), declining 5.02% ; and wind farm owner and operator China Longyuan Power Group (0916), falling 4.67% from the previous week. QGRD -- 2.25% higher from the previous week and 17.69% higher than a year ago - 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. Of 22 pure play components, three experienced positive movement while 19 saw losses. QGRD's best pure play performer was Spanish transmission grid owner and operator Red Electrica ( REE), up 1.42% for the week. Rounding out the top five pure play performers were EnerNOC, gaining 1.06% ; smart grid service provider PowerSecure ( POWR), rising 0.40% ; electrical equipment manufacturer AZZ (AZZ), 0.25% lower; and transmission grid owner and operator ITC Holdings ( ITC), lower by 0.48% . QGRD's worst performers included SatCon Technology, losing 15.84% ; demand energy management service provider Comverge ( COMV), down 8.32% ; utility specialty contractor Quanta Services ( PWR), down 6.15% ; utility wire and cable provider General Cable ( BGC), lower by 4.79% ; and utility network provider Esco Technologies ( ESE), falling 4.64% .