After a successful EPC calculation, an XML document is normally produced within the project folder that can be used to lodge the EPC. If one isn't produced, the following article should help.
An XML file will not be generated for England, Northern Ireland, or Wales when using Hevacomp. This is because the latest SBEM version must be used and is now available in OpenBuildings Energy Simulator.Hevacomp continues to be able to produce Scottish XML's at this time.