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The overall market was also relatively calm -- the S&P 500 gained 0.28% and Nasdaq gained 0.21% -- while AMEX Oil was 0.06% lower from the previous week.
CELS -- down 3.03% for the week but 6.48% 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, nine experienced gains and 42 lost ground.
CELS' best performer for the week was network infrastructure product provider Echelon (ELON - Get Report), gaining 2.84%. Rounding out the top five CELS performers were carbon fiber material developer Zoltek Companies (ZOLT - Get Report), up 2.83%; energy storage device maker Advanced Battery Technologies (ABAT), higher by 2.59%; utility network provider ESCO Technologies (ESE - Get Report), up 2.59%; and energy management device manufacturer AVX Corporation (AVX - Get Report), 2.07% higher for the week.CELS' worst performer last week was solar and LED manufacturing equipment provider Veeco Instruments (VECO - Get Report), declining 16.35%. Other worst performers included energy delivery technology developer American Superconductor (AMSC - Get Report), losing 13.02%; electronic materials provider Rubicon Technology (RBCN), down 11.00%; smart grid service provider PowerSecure International (POWR), retreating 10.38%; and solar wafer producer ReneSola (SOL - Get Report), 8.34% lower for the week. QWND -- 0.49% higher last week but 34.57% 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, nine saw gains, eight experienced losses, and one remained unchanged for the week. QWND's best pure play performer for the week was renewable energy developer Gamesa Corporacion Tecnologica (GAM), up 9.65%. Other top pure play performers included wind farm owner Infigen Energy (IFN), gaining 5.77%; wind farm developer and parts manufacturer China WinPower Group (0182), rising 3.90%; renewable energy project developer EDP Renovaveis (EDPR), up 3.71%; and Zoltek Companies, higher by 2.83% for the week. QWND's worst pure play performers were American Superconductor, losing 13.02%; wind turbine equipment manufacturer China High Speed Transmission Equipment Group (0658), down 6.88%; wind power developer Japan Wind Development (2766), losing 2.23%; wind farm developer China Longyuan Power (0916), declining 1.97%; and advanced composite material developer Gurit (GUR), falling 0.93% from the previous week.