NEW YORK ( TheStreet) -- Clean Edge and Nasdaq's three benchmark clean-tech stock indexes each experienced losses last week with the Nasdaq Clean Edge Green Energy Index (CELS) down 3.05 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index (QWND) losing 2.97 percent, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index (QGRD) 1.08 percent lower from the previous week.
The overall market saw similar negative movement last week: the S&P 500 lost 2.51 percent, Nasdaq contracted 2.73 percent and AMEX Oil was 3.28 percent lower.
CELS, down 3.05 percent for the week but 27.07 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 53 total components, 15 were in positive territory while 38 lost ground from the previous week's close.CELS' best performer for the week was energy-efficient power conversion equipment maker Power-One (PWER - Get Report), gaining 40.86 percent. Rounding out the top five CELS performers were advanced composite material developer Hexcel (HXL - Get Report), up 10.20 percent; thin-film solar product manufacturer First Solar (FSLR - Get Report), rising 7.55 percent; solar power module encapsulant manufacturer STR Holdings (STRI - Get Report), gaining 7.26 percent; and electric motor developer UQM Technologies (UQM - Get Report), up 7.11 percent. CELS' worst performer last week was solar wafer manufacturer MEMC Electronic Materials (WFR), declining 18.02 percent. Other poor performers included semiconductor equipment provider Aixtron (AIXG), falling 17.21 percent; solar and LED equipment provider Veeco Instruments (VECO), losing 14.76 percent; power conversion device maker Power Integrations (POWI), down 12.19 percent; and biomaterials developer Metabolix (MBLX), losing 11.02 percent. QWND, down 2.97 percent last week but 3.54 percent 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 21 pure play components, four saw gains last week, 12 lost ground, and one remained unchanged.
QWND's best pure play performer for the week was gearbox and drive train maker Hansen Transmissions International (HSN), gaining 3.94 percent. Other top pure play performers included carbon fiber material developer Zoltek Companies (ZOLT), up 2.61 percent; wind turbine equipment maker China High Speed Transmission Equipment Group (0658), , rising 1.41 percent; wind turbine manufacturer Vestas Wind Systems (VWS), gaining 0.88 percent; and renewable energy developer EDP Renovaveis (EDPR), unchanged for the week.