Clean Edge and Nasdaq's three benchmark clean-tech stock indexes ended the week higher with the Nasdaq Clean Edge Green Energy Index ( CELS) up 8.07 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index ( QWND) growing 3.53 percent, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index ( QGRD) 6.24 percent higher from the previous week.

The overall market saw similar movement. The S&P 500 gained 3.55 percent, Nasdaq grew 4.15 percent, and AMEX Oil was 2.59 percent higher from the previous week.

CELS --- up 8.07 percent for the week and 4.99 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 53 total component securities, 49 saw gains and four, losses.

CELS' best performer for the week was utility network provider ESCO Technologies ( ESE), gaining 21.12 percent.

Rounding out the top five CELS performers were carbon fiber composite material developer Zoltek Companies ( ZOLT), up 20.29 percent; power management device maker Power-One ( PWER), higher by 20 percent; PV product maker Solarfun Power ( SOLF), rising 18.02 percent; and LED and solar manufacturing equipment provider Veeco Instruments ( VECO), up 16.46 percent.

CELS' worst performer last week was smart meter manufacturer Itron ( ITRI), declining 3.77 percent.

Other poor performers included stationary fuel cell developer FuelCell Energy ( FCEL) , losing 2.44 percent; electric motor maker UQM Technologies ( UQM), down 1.67 percent; vertically integrated solar product manufacturer SunPower Corporation ( SPWRA), retreating 0.07 percent; and integrated semiconductor maker IXYS ( IXYS) , 0.81 percent higher.

QWND -- up 3.53 percent last week but 28.68 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 21 pure play components, 13 experienced gains, 7 lost ground, and one ended the week unchanged.

QWND's best pure play performer for the week was wind power project developer and operator Japan Wind Development ( 2766), up 50.78 percent.

Other top pure play performers included Zoltek Companies, gaining 20.29 percent; energy delivery technology developer American Superconductor ( AMSC), rising 11.57 percent; wind turbine parts maker China High Speed Transmission Equipment Group ( 0658), growing 11.47 percent; and wind farm developer China Longyuan Power Group ( 0916), 10.07 percent higher.

QWND's worst pure play performers were Greece-based renewable energy project developer TENERGY, losing 3.88 percent; wind turbine gearbox maker Hansen Transmission International ( HSN), down 3 percent; Spain-based renewable energy developer Iberdrola Renovables ( IBR) , losing 1.11 percent; wind turbine manufacturer Clipper Windpower ( CWP), declining 1.05 percent; and Spain-based renewable energy producer EDP Renovaveis ( EDPR), falling 0.62 percent from the previous week.

QGRD -- up 6.24 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. Of QGRD's 21 pure play components, 18 experienced gains, two saw losses, and one ended the week unchanged.

QGRD's best pure play performer was ESCO Technologies ( ESE), up 21.12 for the week.

Rounding out the top five pure play performers were Power-One ( PWER) , growing 20 percent; demand energy management firm Comverge ( COMV), rising 14.62 percent; electrical infrastructure contractor MYR Group ( MYRG), 13.26 percent higher; and electrical equipment manufacturer AZZ ( AZZ) , rising 12.04percent.

QGRD's worst performers included energy storage technology developer NGK Insulators ( 53330) , losing 3.81 percent; Itron ( ITRI), down 3.77 percent; Italy-based energy cable provider Prysmian ( PRY) , unchanged for the week; renewable energy inverter maker SMA Solar Technology ( S92), up 1.08 percent; and transformer, substation, and switchgear maker Jinpan International ( JST) , higher by 1.34 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 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.