The aim of ESOS is for large businesses to identify energy savings opportunities by compelling them by legislation to conduct energy audits. The audit has to account for 90% of their energy consumption and the opportunities identified do not have to be implemented. The scheme is regulated by the UK Environment Agency who have said that they are taking a light touch to this piece of legislation, however failure to conduct an ESOS audit could see companies liable for fines of up to £50,000.