PORTLAND, Ore. (Clean Edge) -- Clean Edge and Nasdaq's three benchmark clean-tech stock indices each lost ground last week, with the Nasdaq Clean Edge Green Energy Index, or CELS, down 1.73%; the Nasdaq OMX Clean Edge Global Wind Energy Index, or QWND, losing 1.76%; and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index, or QGRD, 1.39% lower from the previous week.

The overall market saw slight gains last week. The S&P 500 gained 0.86%, Nasdaq grew 0.29% and Amex Oil ended the week up 0.91%.

CELS -- up 1.73% for the week and 50.41% 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 11 components up and nine down. In energy storage and conversion, one component was in positive territory and nine lost ground. For renewable electricity and fuels, all 15 components were down.

CELS' best performer for the week was power management device maker AVX Corporation ( AVX), gaining 4.00%. Rounding out the top five CELS performers were advanced composite material maker Hexcel Corporation ( HXL), up 3.97%; integrated circuit manufacturer Power Integrations ( POWI), rising 3.48%; electronic materials provider Rubicon Technology ( RBCN), gaining 2.77%; and integrated circuit maker Linear Technology ( LLTC), up 2.75%.

CELS' worst performer last week was energy delivery technology developer American Superconductor ( ASMC), declining 15.76%. Other worst performers included lithium-ion battery maker Valence Technology ( VLNC), falling 14.85%; energy storage technology developer Maxwell Technologies ( MXWL), losing 14.61%; solar module maker Trina Solar ( TSL), down 12.99%; and stationary fuel cell developer FuelCell Energy ( FCEL), losing 11.64%.

QWND -- down 1.76% last week and 32.95% 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, nine saw gains last week, 13 lost ground, and one remained unchanged.

QWND's best pure-play performer for the week was wind farm owner and operator China WindPower Group, gaining 5.56%. Other top pure-play performers included wind turbine manufacturer Vestas Wind Systems ( VWS), up 5.12%; wind farm developer Japan Wind Development, rising 4.54%; renewable energy developer PNE Wind, gaining 4.28%; and wind energy equipment maker China High Speed Transmission Group, higher by 3.39%.

QWND's worst pure-play performers were American Superconductor, declining 15.76%; gearbox and drive train maker Hansen Transmission ( HSN), down 6.44%; wind energy product and service provider Broadwind Energy ( BWEN), losing 4.47%; Greece-based renewable energy developer Terna Energy ( TENERGY), declining 3.57%; and renewable energy developer Denmark-based wind energy producer Greentech Energy Systems ( GES), lower by 3.05%.

QGRD -- down 1.39% 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, seven of the 17 pure-play QGRD components saw gains while the remaining 10 lost ground.

QGRD's best pure play performer was wire and cable product provider General Cable Corporation ( BGC), gaining 6.70%. Rounding out the top five pure-play performers were energy contracting service provider Quanta Services ( PIKE), up 5.96%; solar inverter maker SMA Solar Technology ( S92), rising 5.51%; energy contracting service provider Quanta Services ( PWR), 1.52% higher; and utility network provider ESCO Technologies ( ESE), growing 0.95%.

QGRD's worst performers included distribution transformer manufacturer Jinpan International ( JST), losing 17.10%; American Superconductor ( ASMC), down 15.76%; power management product maker Power-One ( PWER), retreating 6.04%; large-scale power conversion provider SatCon Technology ( SATC), down 3.73%; and communication equipment maker RuggedCom ( RCM), lower by 3.58%.

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 indexes -- 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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