In the first picture on the left, our group was trying to figure out the ways in which we would be able to display information about energy use. Our aim was to display the data, so that the user would easily understand how they use their energy.

We took in mind that the only way people would be able to include their data would be through puting pins in the wall and twisting needles around them. The most obvious way was a bar chart. However that wasn't interactive or interesting enough.

We decided that the best way to differentiate data would be through colour coding. A pie chart design at first seemed a good idea, however we realised that people who would have meter readings wouldn't be able to use it. It would only be suitable for the ones who wrote down how long of what thing they used.

After a good hour of head scratching, we came up with a design which would allow to include both kinds of data. As well as devide it up so that the user would see what they used most and the least.

This is a chart of how we imagined the user would use our interface. Blue is electricity and yellow is gas. In this example, the user has both types of data, meter readings and appliances&hours.

In this example, the user wouldn't have a meter reading, but would have other types of data. We imagined that if faced with a problem of irrelevant category, the user would just skip to the next part. Green is electricity and pink is gas.

Our final design is on the left. In the first column, we started with Tuesday as the beginning of the week, because that was the day everyone started recording, and we wanted to see the progress of usage.
In the second column, we created an meters cubed for gas or kilowatts for electricity. However this one was the most problematic to figure out because everyone would've had different numbers. Therefore we had to focus on the amount used. So if on Tuesday one used less than 2kW of electricity, then these would be the pins they would join with thread.
In the third column, we decided instead of giving a very long list of things people might have used during the week, to provide a list of activities/purposes for appliances etc. Not only this allowed our users to be able to include all of their data, but also to see how they used their energy. For example, work vs play, because you can use your laptop for 2hrs, but were you on facebook or doing homework? We also figured that if people recorded how they used energy in rooms, it would also work because they might cook in the kitchen and work in the living room.
The last column was, for example, how many hours I played on a computer.