The energy audit is an approach consisting in carrying out an inventory of the energy performance of a company. In the long term, its objective is to plan the actions to be taken in order to reduce energy consumption and therefore the costs of the company.

The energy audit can be carried out on buildings as well as transport and processes. It is essential that the company concerned defines precisely the scope of application of the obligation, which must cover 80% of the energy bill


The energy audit makes it possible to carry out a detailed assessment of the energy performance of a building and to specify the sources of loss, if there are any. It is therefore a question of improving performance upstream and downstream of reducing the losses identified through personalized solutions adapted to the situation.

The energy audit is more than a simple performance diagnosis. Indeed, it has more advanced objectives, in particular the establishment of a state of performance and detailed energy consumption of the property, the analysis of the points of loss and other sources that require optimization, the issuance of technical recommendations. and financial energy saving programs and prioritization according to their complexity.

As the mandatory energy audit is a global approach, it affects all sources of failure such as heating, domestic consumption, ventilation, lighting, etc.

Its realization makes it possible to avoid overconsumption of energy but also to obtain certain aids and subsidies (e.g.: zero-interest eco-loan for the financing of renovation works).


The companies which must carry out the energy audit are those which employ more than 250 people and / or which have a turnover in excess of 50 million euros and an annual balance sheet in excess of 43 million euros.

However, companies that have an ISO 50001 certification can bypass the obligation to carry out the mandatory energy audit since the certification in question already contributes to improving the energy efficiency of companies.

In addition to companies meeting the criteria set out above, some condominium buildings must also comply with this obligation. These are in particular the buildings which have more than 50 lots (including the main and annex lots), which are used as housing and which are equipped with a collective heating system.

As a reminder, companies had to carry out their mandatory energy audit before December 5, 2015, while apartment buildings must have done it before January 1, 2017. The process allows companies to obtain certification valid for four years while it is valid for ten years for apartment buildings. Once these deadlines come to an end, it is necessary to repeat the audit.


The energy audit must be carried out by an independent auditor, whether or not belonging to the company. This professional must have an OPQIBI qualification. A company that does not comply with the obligation to perform the energy audit risks a penalty of up to 2% of its turnover. In the event of a repeat offense, the penalty can reach up to 4% of turnover.


The ISO 50001 standard is a certification aimed at the most efficient management of energy. It concerns both private and public companies, and at both national and international level. There is no sizeable requirement to apply for this standard, which is open to all legal entities wishing to continuously improve their energy performance.

The standard is assigned within the framework of the Energy Management System. It leads to the optimization of the energy performance of the company, but also to better management of risks relating to climate change and the increase in the price of energy.

In the long term, the ISO 50001 standard should make it possible to advantageously reduce the energy bill, improve the company's investment capacities and the advantages relating to Energy Saving Certificates (EEC).

ISO 50001 certification therefore has similar objectives to those of regulatory energy auditing, hence the fact that the activities covered by this standard may no longer be audited and vice versa.

Thus, to avoid penalties related to the lack of an audit report, the company must be able to present instead an ISO 50001 certification on at least 80% of energy bills. Once the certificate has expired, it is necessary to complete the mandatory energy audit within six months.

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