Clean Edge and Nasdaq's three benchmark clean-tech stock indexes ended a quiet week with the Nasdaq Clean Edge Green Energy Index ( CELS) down 2.33 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index ( QWND) rising 0.14 percent, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index ( QGRD) 1.71 percent lower from the previous week. The overall market saw similar movement. The S&P 500 lost 1.21 percent, Nasdaq fell 0.79 percent, and AMEX Oil was 0.08 percent lower from the previous week. CELS. Which was down 2.33 percent for the week but 3.43 percent higher than a year ago, tracks U.S.-listed clean-energy companies. It 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, 10 enjoyed gains, 42 saw losses, and two ended the week unchanged. CELS' best performer for the week was PV cell and module product maker Canadian Solar ( CSIQ), gaining 10.22 percent. Rounding out the top five CELS performers were semiconductor maker Fairchild Semiconductor International ( FCS), up 8.01 percent; stationary fuel cell developer FuelCell Energy ( FCEL), higher by 6.96 percent; manufacturing equipment provider Aixtron ( AIXG), rising 5.69 percent; and Chinese solar product maker Trina Solar ( TSL), up 5.45 percent. CELS' worst performer last week was wind energy product and service provider Broadwind Energy ( BWEN), declining 12.65 percent. Other worst performers included demand management service provider Comverge ( COMV), losing 11.71 percent; energy storage device manufacturer Maxwell Technologies ( MXWL), down 11.25 percent; ethanol producer Green Plains Renewable Energy ( GPRE), retreating 10.10 percent; and LED and solar manufacturing equipment provider Veeco Instruments ( VECO), 1.76 percent lower. QWND -- up 0.14 percent last week but 27.68 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, seven saw gains, 12 lost ground, and two were unchanged. QWND's best pure play performer for the week was wind power project developer and operator Japan Wind Development Co. ( 2766), up 11.14 percent. Other top pure play performers included wind turbine manufacturer Clipper Windpower ( CWP), gaining 5.56 percent; wind turbine maker Vestas Wind Systems ( VWS), rising 5.39 percent; renewable energy project developer EDF Energies Nouvelles ( EEN), growing 3.70 percent; and Greek renewable energy developer Terna Energy ( TENERGY), 3.40 percent higher.