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), gaining 40.86 percent.

Rounding out the top five CELS performers were advanced composite material developer Hexcel ( HXL), up 10.20 percent; thin-film solar product manufacturer First Solar ( FSLR), rising 7.55 percent; solar power module encapsulant manufacturer STR Holdings ( STRI), gaining 7.26 percent; and electric motor developer UQM Technologies ( UQM), 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.

QWND's worst pure play performers were energy delivery technology developer American Superconductor ( AMSC), declining 7.95 percent; Greece-based renewable energy developer Terna Energy ( TENERGY), down 5.73 percent; Spain-based renewable energy developer Gamesa Tecnologica ( GAM), losing 5.10 percent; wind turbine manufacturer Nordex ( NDXI), declining 5.09 percent; and wind energy product and service provider Broadwind Energy ( BWEN), lower by 5.02 percent.

QGRD, down 1.08 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, seven of the 21 pure play QGRD components saw gains while the remaining 14 lost ground.

QGRD's best pure play performer was Power-One), gaining 40.86 percent. Rounding out the top five pure play performers were smart meter manufacturer Itron ( ITRI), up 2.96 percent; renewable energy inverter maker SMA Solar Technology ( S92), , rising 1.69 percent; energy storage developer NGK Insulators ( 53330), 1.31 percent higher; and utility network provider ESCO Technologies ( ESE), up 1.18 percent.

QGRD's worst performers included transformer manufacturer Jinpan International ( JST), losing 19.67 percent; network infrastructure product maker Echelon ( ELON), down 10.84 percent; American Superconductor, retreating 7.95 percent; demand management firm EnerNOC ( ENOC), down 4.44 percent; and energy management service provder Comverge ( COMV), lower by 4.38 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.
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