Clean Edge and Nasdaq's three benchmark clean-tech stock indexes each bounced back strongly last week with the Nasdaq Clean Edge Green Energy Index ( CELS) up 8.99 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index ( QWND) growing 5.03 percent, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index ( QGRD) 7.08 percent higher from the previous week. The overall market also ended the week higher. The S&P 500 gained 5.42 percent, Nasdaq grew 5 percent, and Amex Oil was 7.58 percent higher from the previous week. CELS -- up 8.99 percent for the week and 15.85 percent 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. Of the 53 total component securities, 51 experienced gains and only two lost ground. CELS' best performer for the week was energy-efficient power conversion device maker Power-One ( PWER), gaining 27.38 percent. Rounding out the top five CELS performers were solar module encapsulant manufacturer STR Holdings ( STRI), up 25.84 percent; solar PV laminate maker Energy Conversion Devices ( ENER), higher by 23.97 percent; Chinese solar cell manufacturer JA Solar ( JASO), rising 21.26 percent; and PV product maker Suntech Power ( STP), up 21.09 percent. CELS' worst performer last week was lithium-ion battery system maker Ener1 ( HEV), declining 4.29 percent. Other poor performers included stationary fuel cell developer FuelCell Energy ( FCEL), losing 0.86 percent; geothermal energy developer Ormat Technologies ( ORA), gaining 1.33 percent; integrated circuit maker O2Micro International ( OIIM), up 1.76 percent; and large-scale power conversion technology developer Satcon Technology ( SATC), 1.76 percent higher. QWND -- up 5.03 percent last week but 24.78 percent lower 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 21 pure play components, 18 experienced gains and three lost ground. QWND's best pure play performer for the week was wind power project developer and operator Japan Wind Development ( 2776), up 21.32 percent. Other top pure play performers included wind energy product and service provider Broadwind Energy ( BWEN), gaining 19 percent; Denmark-based wind farm operator Greentech Energy System ( GES), rising 14.96 percent; wind turbine manufacturer Nordex ( NDX1), up 8.40 percent; and wind farm operator Infigen Energy ( IFN), 6.58 percent higher. QWND's worst pure play performers were wind turbine manufacturer Clipper Windpower ( CWP), losing 12.54 percent; wind farm developer China WindPower Group ( 0182), down 5.19 percent; advanced composite material developer Gurit Holding ( GUR), losing 1.19 percent; wind turbine parts maker China High Speed Transmission Equipment Group ( 0658), gaining 1.25 percent; and renewable energy project developer EDF Energies Nouvelles ( EEN), up 1.69 percent from the previous week.