Energy audit

An energy audit is a structured analysis of all energy flows within a company – electricity, heat, cooling, compressed air, process energy and vehicle fleet – designed to make actual consumption transparent and to identify efficiency measures that pay for themselves. In Germany the legal basis is section 8 of the Energy Services Act (EDL-G), which transposes the European Energy Efficiency Directive. Since the EDL-G amendment of November 2023, the audit obligation applies to companies that are not SMEs within the meaning of EU Recommendation 2003/361/EC and whose average annual total final energy consumption exceeds 2.5 gigawatt hours; non-SMEs below that threshold are now exempt. The audit must be repeated at least every four years. Note that the national transposition of the recast Energy Efficiency Directive (EU) 2023/1791 is not yet complete, so thresholds and reporting duties may shift with further legislative changes.

Methodologically the audit follows the EN 16247 series. Part 1 sets out the general requirements, parts 2 to 4 tailor them to buildings, processes and transport, and part 5 defines the competence of energy auditors. The typical sequence is fixed: initial contact and start-up meeting, data collection covering a representative twelve-month period, on-site visit, analysis of the consumption structure including an economic assessment of the savings options, a written audit report and a closing meeting. Section 8a EDL-G requires that at least 90 percent of total energy consumption be covered – only the remaining ten percent may be treated as de minimis. The audit must be carried out by a qualified and independent person; internal auditors are permitted provided they are not directly involved in the activities being audited. Once the audit is complete, a declaration of compliance must be submitted to the Federal Office for Economic Affairs and Export Control (BAFA), which carries out sample checks; breaches are administrative offences and can be fined.

The energy audit must be clearly distinguished from an energy management system under EN ISO 50001 or participation in EMAS: companies operating either are exempt from the EDL-G audit obligation. The difference is structural. The audit is a periodic snapshot that produces recommendations, whereas a management system is a permanent plan-do-check-act cycle with an energy policy, objectives, performance indicators, internal auditing and external certification, and it demands continuous improvement of energy performance. For larger consumers the choice narrows anyway: section 8 of the German Energy Efficiency Act (EnEfG) requires companies with total final energy consumption of 7.5 gigawatt hours or more to operate an energy or environmental management system, and from 2.5 gigawatt hours upwards implementation plans for measures identified as economically viable must be drawn up and published. For sustainability reporting the audit is valuable groundwork: the energy mix and efficiency measures feed directly into the ESRS E1 climate disclosures and into Scope 1 and Scope 2 accounting.