The biggest change from the existing design came in the form of a colour wheel that was added around the main navigation controls.
The colour changes depending on how much energy is being used with light blue signifying very low energy usage, yellow to represent average use and dark red to signify very high energy usage. This means the user can get a sense of how much energy they are using without having to read the numbers on the screen. Instead they can simply observe the colour of the wheel and get feedback at a glance from across the room.
The interface was completely redesigned using guidelines from Action For Blind People. The text is now 14pt Helvetica in black on white background. Highlighted sections are black on a yellow background an arrows on screen indicate what buttons can be pressed.