Email graphical design to illustrate building energy usage

We have a system with live information about the energy usage (electricity, water, gas or oil) for a building or group of buildings that an organisation may operate. This is targeted toward commercial users, managers of several buildings. We want a HTML email that can be sent every day or week to summarise the energy usage. We can calculate the average energy of each building type we can display this so the user can see if they are ranked better or worse than average. To summarise the information we have is; 1) absolute energy usage for any given time on each energy source, 2) better or worse than previous day, week etc, 3) target energy use for a building of this type, 4) hints and tip of how to save energy.
We have the resource / skills to generate the HTML for the email and this is not required for this job. The scope is to design the graphics using tools of your choice.