PORTLAND, Ore. (Clean Edge) -- Each of Clean Edge and NASDAQ's three benchmark clean-tech stock indexes ended last week down with the Clean Edge Green Energy Index (CELS) losing 3.10 percent, the OMX Clean Edge Global Wind Energy Index (QWND) falling 2.48 percent, and OMX Clean Edge Smart Grid Infrastructure Index (QGRD), down 2.23 percent from the previous week.

The overall market also ended the week down slightly: the S&P 500 lost 0.42 percent, NASDAQ fell 0.25 percent and AMEX Oil ended the week 2.19 percent lower.

CELS, which was down 3.10 percent for the week but 54.16 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.

In the advanced materials sector, all five component companies were in negative territory. Energy intelligence had six components up and 14 down. In energy storage and conversion, four components were in positive territory and six lost ground. For renewable electricity and fuels, one component was up while the remaining 14 saw losses from the previous week's close.

CELS' best performer for the week was stationary fuel cell developer FuelCell Energy ( FCEL), gaining 6.44 percent.

Rounding out the top five CELS performers were solar manufacturing equipment provider GT Solar International ( SOLR), up 5.87 percent; power management device maker O2Micro International ( OIIM), rising 4.36 percent; microturbine maker Capstone Turbine ( CPST), gaining 3.48 percent; and lithium-ion battery maker Valence Technology ( VLNC), up 3.33 percent.

CELS' worst performer last week was geothermal energy developer Ormat Technologies ( ORA), declining 16.17 percent.

Other poor performers included PV product maker Evergreen Solar ( ESLR), falling 11.81 percent; energy delivery technology developer American Superconductor ( AMSC), losing 11.08 percent; vertically integrated solar manufacturer Trina Solar ( TSL), down 9.87 percent; and electronic materials provider Rubicon Technology ( RBCN), losing 9.04 percent.

QWND, which was down 2.48 percent last week but 32.65 percent higher 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 23 pure play components,four saw gains last week while the remaining 19 lost ground.

QWND's best pure play performer for the week was wind farm developer China WindPower Group, gaining 8.97 percent. Other top pure play performers included advanced composite material provider Gurit Holding ( GUR), up 0.97 percent; renewable energy project operator EDF Energies Nouvelles ( EEN), rising 0.40 percent; German wind turbine manufacturer Nordex ( NDX1), gaining 0.11 percent; and India-based wind power company Suzlon Energy, down 0.21 percent.

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