Clean Edge and Nasdaq's three benchmark clean-tech stock indexes experienced mixed performance last week with the Nasdaq Clean Edge Green Energy Index ( CELS) up 1.62 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index ( QWND) down 0.49 percent, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index ( QGRD) 1.32 percent higher from the previous week.

CELS -- up 1.62 percent for the week and 4.25 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 the 51 total component securities, 39 experienced gains and 12experienced losses.

CELS' best performer for the week was wind energy product and service provider Broadwind Energy ( BWEN - Get Report), gaining 27.56 percent.

Rounding out the top five CELS performers were solar cell and module maker Canadian Solar ( CSIQ - Get Report), up 22.03 percent; demand energy management firm Comverge ( COMV), higher by 16.62 percent; solar wafer and module maker LDK Solar ( LDK), up 14.69 percent; and biomaterial developer Metabolix ( MBLX), 13.10 percent higher for the week.

CELS' worst performer last week was solar manufacturing equipment maker Veeco Instruments ( VECO - Get Report), declining 5.83 percent.

Other poor performers included energy storage technology developer A123 Systems ( AONE), losing 5.66 percent; power management device maker Linear Technology ( LLTC), down 4.36 percent; demand management service provider EnerNOC ( ENOC), retreating 3.98 percent; and solar energy product maker Suntech Power ( STP), 0.64 percent lower.

QWND -- down 0.49 percent last week and 36.06 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 18 pure play components, five experienced gains and 13 lost ground.

QWND's best pure play performer for the week was wind turbine manufacturer REpower Systems ( RPW), up 6.05 percent.

Other top pure play performers included North American wind energy project developer Innergex Renewable Energy ( INE), gaining 3.69 percent; energy delivery technology developer American Superconductor ( AMSC), rising 2.74 percent; wind energy project developer China WindPower (0182), growing 2.33 percent; and advanced composite material maker Gurit Holding ( GUR), 0.73 percent higher for the week.

QWND's worst pure play performers were wind turbine gearbox maker Hansen Transmissions International ( HSN), losing 13.11 percent; wind project operator Infigen Energy ( IFN), down 4.11 percent; wind turbine manufacturer Nordex ( NDX1), losing 3.83 percent; wind farm developer China Longyuan Power Group (0916), declining 3.63 percent; and wind gear transmission maker China High Speed Transmission Equipment Group (0658), falling 3.44 percent from the previous week.

QGRD -- 1.32 percent higher 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. Of 22 pure play components, 13 experienced positive movement while nine saw losses.

QGRD's best pure play performer was Comverge ( COMV), up 16.62 percent for the week.

Rounding out the top five pure play performers were renewable energy project integrator Satcon Technology ( SATC), gaining 9.20 percent; electrical infrastructure contractor MYR Group ( MYRG), rising 5.86 percent; utility specialty contractor Pike Electric ( PIKE), 5.06 percent higher; and power management device maker Power-One ( PWER), higher by 4.91 percent.

QGRD's worst performers included communication equipment maker RuggedCom ( RCM), losing 7.59 percent; electrical equipment manufacturer AZZ ( AZZ), down 6.33 percent; EnerNoc ( ENOC), down 3.98 percent; substation equipment manufacturer Jinpan International ( JST) , lower by 3.12 percent; and utility network provider ESCO Technologies ( ESE), falling 2.23 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 CleanEdge.com.