QGRD -- down 9.08% 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, two of the 21 pure play QGRD components saw gains while the remaining 19 lost ground. QGRD's best pure play performer was renewable energy inverter maker SMA Solar Technology (S92), gaining 4.86%. Rounding out the top five pure play performers were wire and cable provider General Cable ( BGC), up 1.89%; Comverge ( COMV), down 2.20%; electric utility contractor Quanta Services ( PWR), 2.29% lower; and communication equipment provider RuggedCom ( RCM), losing 2.91%. QGRD's worst performers included energy management service provider PowerSecure International ( POWR), losing 21.94%; transformer manufacturer Jinpan International ( JST), down 14.87%; American Superconductor ( AMSC), retreating 14.15%; renewable energy project integrator SATC, down 13.88%; and network infrastructure product maker Echelon Corporation ( ELON), lower by 12.79%.