The ideal method to develop and monitor your EnPIs is using of regression analysis of energy use against its driver(s). You want to improve performance and demonstrate this performance improvement. In order to do that the slope of the regression line and/or its intercept with the Y axis will need to be reduced.
Being able to show performance improvement is essential for getting or gaining management commitment. Management wants to see clear results and return on investment for the measures taken. When the energy performance results are polluted with other determinants that can’t be controlled, the shown performance result gives a false representation. When it can be made clear that they do, but that other determinants affect the energy performance of the organization negatively, this will help to keep management commitment.
Many organizations have externally imposed requirements concerning their energy use. These will include local and national laws and corporate or customer requirements. In order to manage your energy effectively you need to be aware of these requirements.
It is recommended that these requirements be reviewed regularly (perhaps every six months) and plans be put in place to ensure compliance with them. Examples, it might be needed to send regular reports of energy use for corporate management purposes. Specific customers may require statements of your approach to energy and carbon emission management. By putting together a list of all these requirements it will make it easier to comply with the requirements and it may also make it easier to plan reports which have similar content for differing authorities. For this purpose the relevant worksheet from the EnMS Tools can be used.