Here’s how to generate Power Efficiency Diagnostics Report in Windows 7:

1. Go to ‘Menu>All Programs>Accessories’, right click ‘Command Prompt’ and select ‘Run as administrator’.

2. Type in the following command:

powercfg -energy -output energy.html

3. The utility will analyze the system for 60 seconds and generate a Power Efficiency Diagnostics Report in your current folder.

4. To view the Power Efficiency Diagnostics Report, open the generated ‘energy.html’ file in your browser. The report will show you detailed information about energy being consumed on your system and suggestions to improve it.