Final

This is the final design for the profile tab, the first tab that can be seen when opening the application. I wanted to give the user useful information at a glance. The user can see that their power use is below average and therefore has a green background. If the user would be using too much power the background will go red. Their progress can be seen at the bottom and other information like experience, rank, and the amount of experience needed to get to the next rank can all be seen in the same area. On the right, the user is reminded of possible achievements it could accomplish, along with how far along they are to accomplishing it "1 day to go".
I originally had all the other icons coloured, but so that there is not too much confusion, the tabs not in use are grey. The user can also see which page they are on at the top, with "home" being darker than the rest. Also "Money Saved" can always be seen at the top, in a larger font because of its importance. A small leaderboard can also be seen at the very bottom. It is simple and shows visually where you are ranked among your friends. The users picture is larger so that they can easily locate themselves.

The next tab, which shows the users house's power used as divided into "Home Appliances", "Water Heating" and "Lighting". The percentages along with the chart shows which parts of their house is using the most power.

The above 3 images are the remaining tabs that show power use around the house. The charts, icons and background are all matching, to make it easy to know which tab they're on. Information about each device is also shown. Showing the Watts that the device uses, along with the time it has been used that day and the Watts per hour. Also the devices can be shown individually, with more information by clicking the names below the chart. Although it did not choose to show this. On the home appliance tab a warning is shown beside the heater because it is using too much power.

I beleive that this type of application, if used on facebook, would encourage power saving with the use of competivness between friends, rewards through achievements and an easy to understand system. The other pages;  leaderboards,achievments and stats would be also similarly themed.