Clean Edge and Nasdaq's three benchmark clean-tech stock indexes each bounced back strongly last week with the Nasdaq Clean Edge Green Energy Index ( CELS) up 8.99 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index ( QWND) growing 5.03 percent, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index ( QGRD) 7.08 percent higher from the previous week.

The overall market also ended the week higher. The S&P 500 gained 5.42 percent, Nasdaq grew 5 percent, and Amex Oil was 7.58 percent higher from the previous week.

CELS -- up 8.99 percent for the week and 15.85 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, 51 experienced gains and only two lost ground.

CELS' best performer for the week was energy-efficient power conversion device maker Power-One ( PWER), gaining 27.38 percent.

Rounding out the top five CELS performers were solar module encapsulant manufacturer STR Holdings ( STRI), up 25.84 percent; solar PV laminate maker Energy Conversion Devices ( ENER), higher by 23.97 percent; Chinese solar cell manufacturer JA Solar ( JASO), rising 21.26 percent; and PV product maker Suntech Power ( STP), up 21.09 percent.

CELS' worst performer last week was lithium-ion battery system maker Ener1 ( HEV), declining 4.29 percent.

Other poor performers included stationary fuel cell developer FuelCell Energy ( FCEL), losing 0.86 percent; geothermal energy developer Ormat Technologies ( ORA), gaining 1.33 percent; integrated circuit maker O2Micro International ( OIIM), up 1.76 percent; and large-scale power conversion technology developer Satcon Technology ( SATC), 1.76 percent higher.

QWND -- up 5.03 percent last week but 24.78 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, 18 experienced gains and three lost ground.

QWND's best pure play performer for the week was wind power project developer and operator Japan Wind Development ( 2776), up 21.32 percent.

Other top pure play performers included wind energy product and service provider Broadwind Energy ( BWEN - Get Report), gaining 19 percent; Denmark-based wind farm operator Greentech Energy System ( GES - Get Report), rising 14.96 percent; wind turbine manufacturer Nordex ( NDX1), up 8.40 percent; and wind farm operator Infigen Energy ( IFN), 6.58 percent higher.

QWND's worst pure play performers were wind turbine manufacturer Clipper Windpower ( CWP), losing 12.54 percent; wind farm developer China WindPower Group ( 0182), down 5.19 percent; advanced composite material developer Gurit Holding ( GUR), losing 1.19 percent; wind turbine parts maker China High Speed Transmission Equipment Group ( 0658), gaining 1.25 percent; and renewable energy project developer EDF Energies Nouvelles ( EEN), up 1.69 percent from the previous week.

QGRD -- up 7.08 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. No pure play components lost ground last week with 21 of the 21 pure play QGRD components seeing gains.

QGRD's best pure play performer was Power-One, gaining 27.38 percent. Rounding out the top five pure play performers were communication network equipment maker RuggeCom ( RCM), up 14.42 percent; renewable energy inverter maker SMA Solar Technology ( S92), up 14.33 percent; demand energy management service provider EnerNOC ( ENOC), 11.30 percent higher; and utility industry specialty contractor Pike Electric ( PIKE), gaining 7.52 percent.

QGRD's worst performers included transformer, substation, and switchgear maker Jinpan International ( JST), gaining 1.23 percent; Satcon Technology ( SATC), up 1.76 percent; energy storage technology developer NGK Insulators ( 53330), 2.75 percent higher; Italy-based energy cable provider Prysmian ( PRY), up 2.88 percent; utility network provider ESCO Technologies ( ESE), higher by 2.90 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