NEW YORK (TheStreet - Clean Edge and NASDAQ's three benchmark clean-tech stock indices experienced mixed performance last week with the NASDAQ Clean Edge Green Energy Index (CELS) up 3.39 percent, the NASDAQ OMX Clean Edge Global Wind Energy Index(QWND) losing 0.64 percent, and the NASDAQ OMX Clean Edge Smart Grid Infrastructure Index(QGRD) 0.19 percent higher from the previous week.

The overall market also saw mixed movement last week - the S&P 500 lost 0.19 percent, NASDAQ grew 1.11 percent and AMEX Oil retreated 0.70 percent.

CELS -- up 3.39 percent for the week and 39.16 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.

In the advanced materials sector, three component companies were in positive territory with the remaining two down. Energy intelligence had 20 components up and three down. In energy storage and conversion, three components were in positive territory while five lost ground. For renewable electricity and fuels, seven components were up and 10 were down from the previous week's close.

CELS' best performer for the week was energy-efficient power conversion equipment maker Power-One ( PWER), gaining 15.68 percent. Rounding out the top five CELS performers were semiconductor maker IXYS Corporation ( IXYS), up 13.01 percent; semiconductor developer Fairchild Semiconductor ( FCS), rising 10.57 percent; thin-film solar manufacturer First Solar ( FSLR), gaining 8.24 percent; and power management integrated circuit maker O2Micro International ( OIIM).

CELS' worst performer last week was fuel cell developer Ballard Power Systems ( BLDP), declining 10.57 percent. Other worst performers included solar cell and module maker Canadian Solar ( CSIQ), falling 8.34 percent; ethanol producer Green Plains Renewable Energy ( GPRE), losing 4.85 percent; energy storage developer Advanced Battery Technologies ( ABAT), down 3.88 percent; and microturbine manufacturer Capstone Turbine Corporation ( CPST), losing 3.05 percent.

QWND - down 0.64 percent last week but 20.45 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, five saw gains last week while 16 lost ground.

QWND's best pure play performer for the week was gearbox and drive train maker Hansen Transmissions International ( HSN), gaining 6.64 percent. Other top pure play performers included energy delivery technology developer American Superconductor ( AMSC), up 4.97 percent; Denmark-based wind energy producer Greentech Energy Systems ( GES), rising 3.30 percent; Denmark- based wind turbine manufacturer VWS gaining 3.06 percent; and wind turbine manufacturer NDX1 higher by 2.12 percent.

QWND's worst pure play performers were wind farm operator China Longyuan Power Group (0916), declining 8.06 percent; Greece-based renewable energy developer Terna Energy (TENERGY), down 6.90 percent; wind power generator Japan Wind Development Co. (2766), losing 6.14 percent; renewable energy developer EDP Renovaveis (EDPR), declining 3.34 percent; and wind farm owner and operator China WindPower Group (0182), lower by 3.33 percent.

QGRD - up 0.19 percent 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, 16 of the 21 pure play QGRD components saw gains while the remaining five lost ground.

QGRD's best pure play performer was Power-One, gaining 15.68 percent. Rounding out the top five pure play performers were communication equipment maker RCM ( RCM), up 7.16 percent; renewable energy project integrator SatCon Technology ( SATC), rising 5.68 percent; American Superconductor ( AMSC), 4.97 percent higher; and electric infrastructure contractor MYR Group ( MYRG), growing 4.53 percent.

QGRD's worst performers included electric grid equipment provider Prysmian ( PRY), losing 6.26 percent; electric management and automation technology developer Schneider Electric ( SU), down 5.69 percent; electric infrastructure contractor Quanta Services ( PWR), retreating 4.97 percent; energy storage technology developer NGK Insulators (53330), down 4.01 percent; and solar power inverter maker SMA Solar Technology (S92), lower by 1.69 percent.

This information is not intended to be used as a guide to investing, and the authors make no guarantees that any investments based on the information contained herein will benefit you in specific applications, owing to the risk that is involved in investing of almost any kind. For more on Clean Edge's stock indices - including methodology, components, historical performance, financial products and licensing information, please visit www.cleanedge.com/ceindex.

Clean Edge, Inc., founded in 2000, is the world's first research and publishing firm devoted to the clean-tech sector. The company, via its publications, events, and online services, helps companies, investors, and governments understand and profit from clean technologies. Clean Edge, with offices in the San Francisco Bay Area and Portland Oregon, offers insight and intelligence on emerging clean-tech trends, opportunities, and challenges. The company publishes a range of reports including the annual Clean Energy Trends and Clean Tech Job Trends report series; hosts the annual Clean-Tech Investor Summit (along with IBF); maintains a number of benchmark clean-tech stock indices with NASDAQ OMX including CELS, QGRD, and QWND; and produces Clean Edge Jobs, a leading online jobs board for clean-tech job seekers, employers, and recruiters. To keep abreast of the latest clean-tech news; access industry reports; learn more about our services; or sign up for our free e-newsletters; visit CleanEdge.com.

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