Clean Edge and Nasdaq's three benchmark clean-tech stock indexes each fell last week with the Nasdaq Clean Edge Green Energy Index ( CELS) down 2.83 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index ( QWND) 4.93 percent lower, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index ( QGRD) retreating 5.55 percent higher from the previous week.

The overall market also moved lower. The S&P 500 lost 1.79 percent and Nasdaq fell 2.29 percent, while AMEX Oil was 0.63 percent lower from the previous week.

CELS - down 2.83 percent for the week but 13.27 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, five experienced gains, 45 lost ground, and one remained unchanged for the week.

CELS' best performer for the week was electric vehicle manufacturer Tesla Motors ( TSLA), gaining 22.209 percent.

Rounding out the top five CELS performers were solar energy product maker Energy Conversion Devices ( ENER), up 14.57 percent; semiconductor manufacturer Microsemi ( MSCC) , higher by 6.94 percent; utility network provider ESCO Technologies ( ESE), up 3.57 percent; and wafer manufacturer MEMC Electronic Materials ( WFR), 2.12 percent higher for the week.

CELS' worst performer last week was biomaterials developer Metabolix ( MBLX) , declining 25.14 percent.

Other poor performers included solar module encapsulant maker STR Holdings ( STRI), losing 21.45 percent; demand management service provider Comverge ( COMV), down 20.67percent; Chinese solar produce manufacturer Solarfun Power Holdings ( SOLF), retreating 17.86 percent; and demand management firm EnerNOC ( ENOC), 17.77 percent lower.

QWND - 4.93 percent lower last week and 36.51 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, three saw gains while 15 experienced losses.

QWND's best pure play performer for the week was wind power generator Japan Wind Development Co. (2766), up 9.65 percent.

Other top pure play performers included renewable power developer Gamesa Corporacion Tecnologica ( GAM), gaining 4.99 percent; wind turbine gearbox maker Hansen Transmissions International ( HSN), rising 1.58 percent; wind turbine manufacturer Vestas Wind Systems ( VWS), losing 1.15 percent; and wind project developer China WindPower Group (0182), down 1.23 percent for the week.

QWND's worst pure play performers were wind turbine manufacturer Nordex ( NDX1), losing 8.53 percent; carbon fiber material developer Zoltek Companies ( ZOLT), down 7.06 percent; German wind turbine maker REpower Systems ( RPW), losing 6.90 percent; energy delivery technology developer American Superconductor ( AMSC), declining 6.79 percent; and France-based wind energy project developer Theolia ( TEO) falling 6.20 percent from the previous week.

QGRD - 5.55 percent lower from the previous week but 3.45 percent higher than a year ago - 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, four experienced positive movement while 18 saw losses on the week.

QGRD's best pure play performer was communication equipment provider RuggedCom ( RCM), up 7.58 percent for the week.

Rounding out the top five pure play performers were ESCO Technologies, gaining 3.57 percent; energy storage technology developer NGK Insulators (53330), rising 2.22 percent; Spanish transmission grid owner and operator Red Electrica Corporacion ( REE) , 1.06 percent higher; and utility network infrastructure product provider Echelon Corporation ( ELON) (ELON), lower by 1.38 percent.

QGRD's worst performers included Comverge, losing 20.67 percent; Enernoc, down 17.77 percent; solar inverter maker SMA Solar Technology (S92), down 13.06 percent; electrical infrastructure specialty contractor MYR Group ( MYRG), lower by 12.59 percent; and renewable energy project integrator SatCon Technology ( SATC), falling 9.74 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
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