The Energy Balance Assessment Tool (EBAT) was developed to provide policy makers and those providing water and wastewater services with a means of identifying where within the urban water cycle potential energy savings or opportunities for recovery exist. Microsoft Excel was chosen as the medium to support EBAT as it is the spreadsheet application common to the European Computer Driving License (ECDL) and therefore applicable across all EU member states. The rationale underpinning the development of the model was that it should be able to track water from the point of abstraction to the point at which it is returned to the natural environment. Specifically it was to include: energy and volumetric measures for abstraction, treatment, supply, use in Domestic Hot Water (DHW), pumping within the sewer system and wastewater treatment. The driving philosophy behind the design of the tool was that it should be simple to use, allow for user input variables to be entered, and show annual results for energy used and associated emissions produced, expressed as a measure of equivalent carbon dioxide (CO2e), for a specified catchment size.