Clean Edge and Nasdaq's three benchmark clean-tech stock indices ended a calm week, with the Nasdaq Clean Edge Green Energy Index (CELS) down 0.01%, the Nasdaq Clean Edge Global Wind Energy Index (QWND) 1.84% lower, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index (QGRD) climbing 0.76%.The overall market also saw tepid movement for the week -- the S&P 500 gained 0.04%, the Nasdaq was down 0.18% and Amex Oil ended the week down 1.87%.
QWND -- down 1.84% last week and up 44.19% in the last 12 months -- includes companies that are primarily manufacturers, developers, distributors, installers and users of energy derived from wind sources. Of QWND's 24 pure play components, 10 saw gains, 12 lost ground, and two ended the week unchanged. QWND's best pure play performer for the week was wind turbine manufacturer Clipper Windpower ( CWP), which gained 20.89%. United Technologies ( UTX) has announced plans to acquire 49.5% of the California-based company. Other top pure-play performers included American Superconductor, climbing 12.21%; wind turbine maker REpower Systems ( RPW), up 9.33%; wind farm builder and operator Terna Energy ( TENERGY), growing 6.77%; and wind energy product and service provider Broadwind Energy ( BWEN), up 5.38%. QWND's worst pure-play performers were wind power plant developer China WindPower Group , down 10.31%; wind turbine maker Vestas Wind Systems ( VWS), losing 7.78%; wind energy company PNE Wind, falling 5.92%; wind power generator Japan Wind Development, declining 5.32%; and Spain-based renewable energy firm Gamesa Corporacion Technologica ( GAM), falling 4.53%. QGRD -- up 0.76% 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, nine pure play QGRD components saw gains and seven lost ground. QGRD's best pure-play performer was American Superconductor, gaining 12.21%. Rounding out the top five pure-play performers were transmission system owner and operator ITC Holdings ( ITC), rising 6.93%; energy demand management firm Comverge ( COMV), up 4.48%; smart meter manufacturer Itron ( ITRI), climbing 3.64%; and power conversion-device maker Power-One ( PWER), growing 3.59%. QGRD's worst performers included electricity automation provider Schneider Electric ( SU), losing 4.49%; communication network equipment provider RuggedCom ( RCM), down 3.93%; Chinese transformer manufacturer Jinpan International ( JST), retreating 1.42%; network infrastructure developer Echelon ( ELON), falling 1.27%; and energy storage developer NGK Insulators , down 0.73%.