Clean Edge and Nasdaq's three benchmark clean-tech stock indexes experienced mixed movement last week with the Nasdaq Clean Edge Green Energy Index ( CELS) down 2.24 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index ( QWND) falling 1.54 percent, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index ( QGRD) 0.09 percent higher from the previous week.

The overall market was slightly higher. The S&P 500 gained 1.54 percent and Nasdaq grew 3.23 percent, while AMEX Oil saw a 0.64 percent gain from the previous week.

CELS -- down 2.24 percent for the week and 1.65 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, 21 experienced gains, 29 experienced losses, and one remained unchanged for the week.

CELS' best performer for the week was power converter technology developer Vicor Corporation ( VICR), gaining 17.07 percent.

Rounding out the top five CELS performers were electronic materials provider Rubicon Technology ( RBCN), up 13.76 percent; biomaterial developer Metabolix ( MBLX), higher by 7.92 percent; renewable energy project integrator SatCon Technology ( SATC), up 4.09 percent; and power management device maker Power-One , 3.97 percent higher for the week.

CELS' worst performer last week was wind product and service provider Broadwind Energy ( BWEN), declining 13.96 percent. Other worst performers included solar wafer and module manufacturer LDK Solar ( LDK), losing 11.39 percent; LED lighting manufacturer Cree ( CREE), down 11.24 percent; vertically integrated solar product maker Yingli Green Energy ( YGE), retreating 11.20 percent; and Chinese solar product manufacturer ReneSola ( SOL), 8.83 percent lower.

QWND -- down 1.54 percent last week and 34.52 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, six experienced gains and 12 lost ground.

QWND's best pure play performer for the week was renewable energy developer Gamesa Corporacion Tecnologica ( GAM), up 5.43 percent.

Other top pure play performers included renewable energy project developer EDP Renovaveis ( EDPR), gaining 3.87 percent; Germany-based wind turbine maker REpower Systems ( RPW), rising 2.39 percent; wind power producer Innergex Renewable Energy ( INE), growing 1.24 percent; and wind turbine manufacturer Nordex ( NDX1), 1.11 percent higher for the week.

QWND's worst pure play performers were wind turbine gearbox maker Hansen Transmissions International ( HSN) (HSN), losing 16.36 percent; wind gear transmission equipment developer China High Speed Transmission Equipment Group (0658), down 4.86 percent; energy delivery technology developer American Superconductor ( AMSC), losing 3.81 percent; wind project developer China WindPower Group (0182), declining 3.53 percent; and wind farm developer China Longyuan Power Group (0916), falling 3.47 percent from the previous week.

QGRD -- 0.09 percent lower 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, 10 experienced positive movement while 12 saw losses.

QGRD's best pure play performer was substation tansformer maker Jinpan International ( JST), up 20.76 percent for the week.

Rounding out the top five pure play performers were utility cable and wire provider General Cable Corporation ( BGC), gaining 6.39 percent; SatCon Technology ( SATC), rising 4.09percent; Power-One, 3.97 percent higher; and utility cable provider Prysmian ( PRY), higher by 2.14 percent.

QGRD's worst performers included American Superconductor, losing 3.81 percent; solar inverter maker SMA Solar Technology (S92), down 3.61 percent; utility specialty contractor Quanta Services ( PWR), down 3.39 percent; utility network provider ESCO Technologies ( ESE), lower by 3.38 percent; and smart meter manufacturer Itron ( ITRI), falling 2.47 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.