I have searched the Xilinx website from top to bottom, but I cannot find a link to the Virtex-5QV XPE spreadsheet.
Where is it located?
The Xilinx Power Estimator is available on the Xilinx Power page via the Virtex-6 XPE tool download link; see the header "Download the XPE tool that is right for you" at the bottom of this page: http://www.xilinx.com/products/technology/power/index.htm
The direct link to the Virtex-5QV XPE is: http://www.xilinx.com/ise/power_tools/license_virtex5.htm
After downloadingthe spreadsheet, select the Virtex-5 Space Grade device to estimate power consumption for the Virtex-5QV.