In order to identify your significant energy uses (SEUs), you need to know how much energy each process or system uses. In reality, few or none of your uses will be sub-metered. In that case you need a way of estimating their consumption. You need to carry out this activity for each energy source, i.e. electricity and each fuel type.
Understanding the dynamics of energy use in a system will lead to optimal energy savings. There are many other techniques available to analyze energy data and create useful information. Tables, pie charts, bar charts, multiple year comparisons, process mapping and energy balances are some of the more important.