NEW YORK (TheStreet) -- Each of Clean Edge and Nasdaq's three benchmark clean-tech stock indices fell last week with the Nasdaq Clean Edge Green Energy Index (CELS) down 3.95 percent, the Nasdaq OMX Clean Edge Global Wind Energy Index (QWND) down 3.37 percent, and the Nasdaq OMX Clean Edge Smart Grid Infrastructure Index (QGRD) 3.44 percent lower from the previous week.

The overall market also ended the week with losses -- the S&P 500 lost 3.65 percent, Nasdaq dipped 3.74 percent, and AMEX Oil was 5.65 percent lower from the previous week.

CELS -- down 3.95 percent for the week but 2.03 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, 13 experienced gains and 40 lost ground.

CELS' best performer for the week was lithium-ion battery system maker Ener1 ( HEV), gaining 10.54 percent. Rounding out the top five CELS performers were energy storage technology developer A123 Systems ( AONE), up 10.51 percent; microturbine manufacturer Capstone Turbine ( CPST - Get Report), higher by 10.00 percent; large-scale power conversion technology developer Satcon Technology ( SATC), rising 9.12 percent; and biomaterial developer Metabolix ( MBLX), up 6.08 percent.

CELS' worst performer last week was stationary fuel cell developer FuelCell Energy ( FCEL - Get Report), declining 26.47 percent. Other worst performers included wind energy product and service provider Broadwind Energy ( BWEN - Get Report), falling 13.43 percent; solar cell and module producer Canadian Solar ( CSIQ), losing 10.77 percent; vertically integrated solar product provider SunPower Corporation ( SPWRA), down 10.70 percent; and wafer manufacturer MEMC Electronic Materials (WFR), down 9.35 percent.

QWND -- down 3.37 percent last week and 28.32 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, four experienced gains, 16 saw losses, and one remain unchanged.

QWND's best pure play performer for the week was wind farm developer China WindPower Group (0182), up 10.14 percent. Other top pure play performers included German wind turbine maker REpower Systems (RPW), gaining 2.22 percent; wind farm operator Infigen Energy (IFN), rising 0.85 percent; carbon fiber composite material maker Zoltek Companies (ZOLT), growing 0.30 percent; and Spain-based renewable developer (EDPR), unchanged over the last week.

QWND's worst pure play performers were wind power project developer and operator Japan Wind Development Co. (2766), losing 16.10 percent; wind turbine manufacturer Clipper Windpower (CWP), down 13.56 percent; Broadwind Energy (BWEN), losing 13.43 percent; Denmark-based wind farm operator Greentech Energy System (GES), declining 7.04 percent; and wind turbine manufacturer Vestas Wind Systems (VWS), down 6.81 percent from the previous week.

QGRD -- down 3.44 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. Last week, seven of the 21 pure play QGRD components saw gains while 13 lost ground and one remained unchanged.

QGRD's best pure play performer was Satcon Technology (SATC), gaining 9.12 percent. Rounding out the top five pure play performers were electric infrastructure specialty contractor MYR Group (MYRG), up 6.28 percent; demand energy management service provider EnerNOC (ENOC), up 3.92 percent; demand energy management firm Comverge (COMV), 2.98 percent higher; and utility network provider ESCO Technologies (ESE), gaining 2.00 percent.

QGRD's worst performers included renewable energy inverter maker SMA Solar Technology (S92), losing 7.16 percent; electricity automation and managment company Schneider Electric (SU), down 5.63 percent; energy storage technology developer NGK Insulators (53330), retreating 5.48 percent; energy delivery technology developer American Superconductor (AMSC), down 5.40 percent; utility industry specialty contractor Quanta Services (PWR), lower by 4.33 percent.

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