QWND's worst pure play performers were German wind turbine manufacturer Nordex ( NDX1), declining 6.55 percent; gearbox and drive train maker Hansen Transmission ( HSN), down 6.12 percent; renewable energy developer PNE Wind ( PNE3), losing 4.06 percent; wind farm owner and operator Japan Wind Development, declining 3.22 percent; and wind turbine developer Clipper Windpower ( CWP), lower by 3.18 percent. QGRD, up 1.31 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, 11 of the 21 pure play QGRD components saw gains while the remaining 10 lost ground. QGRD's best pure play performer was Power-One ( PWER), gaining 15.92 percent. Rounding out the top five pure play performers were American Superconductor ( AMSC), up 9.51 percent; solar inverter maker SMA Solar Technology, rising 4.66 percent; smart meter manufacturer Itron ( ITRI), 4 percent higher; and distribution transformer manufacturer Jinpan International ( JST), growing 0.95 percent. QGRD's worst performers included Italian energy cable provider Prysmian ( PRY), losing 11.5 percent; electric infrastructure contractor MYR Group ( MYRG), down 6.54 percent; ESCO Technologies ( ESE), retreating 6.09 percent; wire and cable product provider General Cable ( BGC), down 4.25 percent; and electricity distrubution and automation developer Schneider Electric ( SU), lower by 3.38 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 our site.