If you are running Windows 7, and you are wondering whether your computer is using more power than it needs to, worry no more. Windows 7 has a built in tool called Powercfg that can help you analyze how efficiently you computer is using power and it can also point out the problem areas to you.

Efficient power management is all the more important in a laptop and Powercfg could be a very useful tool to prolong your laptops battery life.

Here is how you use powercfg.

  1. Open up the command prompt with administrative privileges. To do this, click on the Start button and in the search box enter cmd. Now press Ctrl+Shift+Enter to open the command prompt window in an elevated mode. Alternatively you can right click cmd in the resulting list and click on Run as Administrator.
  2. Once the command window opens, type powercfg –energy in the prompt and hit Enter.
  3. Powercfg will analyze you computers behavior for the next 60 seconds.
  4. Once powercfg has finished analyzing your computer, you can open the energy-report.html file that is generated in the System32 folder. The report categorizes the findings under Errors, Warnings and Information.
Based on the report, you can tweak your system to make it more power efficient.

Here is what the report looks like.

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