Each of Clean Edge and Nasdaq's three benchmark clean-tech stock indexes ended last week higher, with the Nasdaq Clean Edge Green Energy Index (CELS) gaining 1.77%, the Nasdaq OMX Clean Edge Global Wind Energy Index (QWND) rising 1.62%, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index (QGRD) up 2.28%.The overall market also gained -- the S&P 500 was up 3.13%; the Nasdaq rose 2.76% and the Amex Oil Index ended the week 2.95% higher. CELS -- up 1.77% for the week and 49.44% higher than a year ago -- tracks U.S.-listed clean-energy companies and is divided into four categories: advanced materials; energy intelligence; energy storage and conversion; and renewable electricity generation and renewable fuels. In the advanced materials sector, four of the five component companies were in positive territory. Energy intelligence had 13 components up and one down. Seven energy storage and conversion components were in positive territory while three lost ground. For renewable electricity and fuels, six components were up, eight were down, and one remained unchanged from the previous week's close. CELS' best performer for the week was lithium-ion battery maker Valence Technology ( VLNC), gaining 15.38%. Rounding out the top five CELS performers were geothermal power developer Raser Technologies ( RZ), up 10.75%; semiconductor maker IXYS ( IXYS), rising 10.75%; lithium-ion battery manufacturer Ener1 ( HEV), gaining 10.19%; and smart meter manufacturer Itron ( ITRI), up 9.05%. CELS' worst performer last week was demand energy management firm EnerNOC ( ENOC), which declined 15.04%. Other worst performers included energy storage product maker Maxwell Technologies ( MXWL), down 10.28%; solar cell and module manufacturer Canadian Solar ( CSIQ) lost 9.35%; demand management service provider Comverge ( COMV) was down 7.31%; and power management semiconductor developer Advanced Analogic Technologies ( AATI) dropped 6.50%.
QWND -- up 1.62% last week and 28.78% higher 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 23 pure play components, 13 saw gains last week while the remaining 10 lost ground. QWND's best pure play performer for the week was renewable energy developer Gamesa Corporacion Technologica ( GAM), which gained 8.53%. Other top pure-play performers included wind turbine manufacturer Vestas Wind Systems ( VWS), up 7.10%; wind energy developer PNE Wind ( PNE3), rising 6.88%; wind farm owner and operator Theolia ( TEO), gaining 4.04%; and renewable energy producer EDP Renovaveis ( EDPR), up 3.81%. QWND's worst pure play performers were wind turbine manufacturer CWP, declining 7.17%; wind energy product and service provider Broadwind Energy ( BWEN), down 5.10%; India-based wind power company Suzlon Energy , losing 4%; wind farm builder and operator Greentech Energy Sytsems ( GES), falling 3.06%; and energy technology developer China High Speed Transmission Equipment Group, declining 1.99%. QGRD -- up 2.28% from the previous 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 of the 17 pure play QGRD components saw gains while the remaining seven lost ground. QGRD's best pure play performer was Itron ( ITRI), gaining 9.05%. Rounding out the top five pure-play performers were solar energy inverter manufacturer SMA Solar Technology, up 5.87%; power management product maker Power-One ( PWER), rising 11.07%; energy management technology developer Schneider Electric ( SU), higher by 5.10%; and transmission grid owner and operator ITC Holdings ( ITC), up 4.48%. QGRD's worst performers included EnerNOC ( ENOC), losing 15.04%; Comverge ( COMV), down 7.31%; wire and cable product provider General Cable ( BGC), retreating 2.41%; transformer manufacturer Jinpan International ( JST), down 1.92%; and energy delivery technology developer American Superconductor ( AMSC), losing 1.22%.