How do I display all power plans in Windows 7 notification area?

Shameless plug: Power Buddy

Power Buddy is a very lightweight system tray application that allows you to switch between all the defined power plans.

No malware. No junk.

Full Disclosure: I am the author of this project.

Windows 7 has no natural settings to show more than 2 power plans in the system tray. However, you can create shortcuts or hotkeys to switch between your power plans. How-to Geek has a nice article about how to do that: Create a Shortcut or Hotkey to Switch Power Plans.

One of the users in a forum having the same question as you says that this solution is perfect; but each time he ran the shortcut, the command prompt popped up for a second. To prevent this he created a small script. You can see the related post here.

There is also a Windows sidebar gadget which can do what you want. It's called Power Scheme and can be downloaded from this page.

Although you avoid 3rd party solutions, there is a tool called Power Plan Assistant for Windows® 7 which can do the job as well.

I would recommend Battery Care, a freeware tool that does more than allowing you to easily change the power plans (Power Saver, Balanced and High Performance) . See this Battery Care review