ISO 50003

ISO 50003: Focus on energy efficiency

On 14 October 2017, accreditation standard ISO 50003 became the new basis for certification of management systems according to ISO 50001. This also has an impact on organisations who are already certified according to ISO 50001 or who wish to achieve certification.

Since the transition of the accreditation standard, organisations have to demonstrate increased methodology competence with regard to measurement and analysis, and also stronger proof of improvement in their energy performance. The quantified evidence of improvement is acquired through comparison of measurable results with the energy baseline or the results from the previous measuring period.

Themes such as measurement and creation of meaningful energy performance indicators (EnPI) for providing evidence of improvements in energy efficiency are becoming ever more important and require a high level of method-related competence on the part of the energy team. The general objective is to increase the transparency and the effectiveness of the energy management system.

Benefits for your organisation

  • Systematic approach to increasing energy efficiency and overall energy performance
  • Cost saving and efficient use of resources through recognition of energy saving potentials
  • Energy-related tax reliefs for industrial production companies within the framework of the Tax Cap (§ 55 of the German Energy Tax Act – EnergieStG – and § 10 of the German Electricity Tax Act – StromStG)).  
  • Limitation of the EEG energy surcharge relating to manufacturing companies with high energy consumption (§ 64 German Renewable Energy Sources Act (EEG))
  • Positive image projected to the outside world through a valid ISO 50001 certificate, which testifies to the commitment of the organisation to energy efficiency.
  • Fulfilment of the legal requirement according to § 8 of the German Energy Services Act (EDL-G) for so-called "non-SMEs”     

What has changed because of ISO 50003?

Sector-specific assessment of auditor competence

With ISO 50003, the former two sectors A and B were replaced by eight "Technical Areas". Organisations are assigned to one of these eight technical areas. All auditors have to possess the competence for the relevant technical area.

Improvement of energy performance

With the implementation of ISO 50003 it became mandatory to provide proof of “continuous improvement of the energy performance”. In other words, this proof has to be provided by the organisation at least in every certification or recertification audit.

Introduction of ISO 50001:2018 also means that energy performance indicators or baselines have to be subjected to so-called “normalisation” if influencing factors such as outside temperature, the quality of the raw materials or the product mix have a significant impact on the performance indicators. This assumes a high level of competence in using appropriate methods (see ISO 50006, ISO 50047).

Therefore certified organisations have to focus more strongly on the area of measurement (in particular on the measuring concept) and the provision of proof of improvement of the energy performance (including normalisation):

  • Determination of the appropriate/relevant energy performance indicators (EnPIs)
  • Review of the informative value of the energy baselines (EnBs)
  • Type, location and time of the measurements
  • Type of documentation for recording and documenting measurements and their results
New calculation basis for the audit time

With ISO 50003, a new calculation basis for establishment of the audit time was introduced. The calculation of the audit time now takes the number of energy sources into account as well as the amount of energy consumption, the number of significant energy uses and the number of EnMS-effective employees.


Guidance and practical tips

The following standards offer guidance with measuring energy performance and/or with determining and evaluating the energy baseline and the energy performance indicators:

  • ISO 50004: EnMS – Guidance for the implementation, maintenance and improvement of an energy management system
  • ISO 50006: EnMS ‒ General principles and guidance ‒ Measuring energy performance using energy baselines (EnB) and energy performance indicators (EnPI) 
  • ISO 50015: EnMS ‒ General principles and guidance ‒ Measurement and verification of energy performance of organizations 
  • ISO 50047: Energy savings ‒ Determination of energy savings in organisations


Which regulation was changed exactly?

The accreditation standard ISO 50003:2014 replaced the former DAkkS Regulation 71 SD 6 022 on 14 October 2017. As a result, the existing accreditation was transferred to accreditation standard ISO 50003:2014. ISO 50003:2014 contains specific requirements which are added to those of ISO 17021:2015 and have to be taken into account.

What is the definition of “energy consumption”?

Energy consumption is the amount of energy used from one or several energy sources. Energy or energy source means electricity, fuels, steam, heat, compressed air or comparable media. All energy sources have to be taken into account which originate from outside the audit boundary of the EnMS of the site. The consumption period is generally the previous calendar or fiscal year.

What do I have to take into consideration within the framework of demonstrable improvement of the energy performance?

Proof of improvement of the energy performance is a prerequisite for the positive certification decision in every certification or recertification audit. The quantified proof is acquired through comparison of measurable results with the energy baseline or the results from the previous measuring period.

What is special about ISO 50003?

ISO 50003 is an accreditation standard for certification bodies who certify management systems in accordance with ISO 50001. It contains information and requirements which are additional to those of ISO 17021 and had to be put into practice by the certification bodies by 14 October 2017. However, the new requirements also impact organisations who have already implemented a certified energy management system or wish to achieve certification in future. (A vital feature is the requirement to provide "proof of improvement of the energy performance").  

How is the EnMS-effective personnel defined or determined?

ISO 50003 defines the EnMS effective personnel in terms of the number of those employees who materially impact the EnMS and/or the improvement of the energy performance and who actively contribute to fulfilling the requirements of an EnMS. They can include the senior management, the works management, the energy management team, the energy management representative, divisional and departmental managers and also machine operators. The organisation determines the EnMS effective personnel with the help of a detailed  customer questionnaire supplied by TÜV NORD, which also contains examples. The required audit time is determined on this basis, and the offer is then drafted.

What are significant energy uses / energy consumers?

Energy uses can consist of ventilation, lighting, heating, cooling, transport, processes, production lines etc. The significance of the various uses is assessed by the company based on criteria drawn from ISO 50001.  In general, an energy use or energy consumer can be considered significant if it accounts for at least five per cent of the total energy use.

Several production facilities of the same kind can be combined into one “production line” and be counted as one significant energy use. In the same way, integrated systems – such as for example air conditioning – can be combined into one significant energy use. The number of significant energy uses must be documented and is continuously monitored in the audits

Certification with TÜV NORD

TÜV NORD is recognised as a well-established and reliable provider of inspection and certification services, assessing fulfilment of legal regulations and voluntary standards all over the world. We employ experienced specialists in all our areas of activity. As a matter of principle, our auditors are trained to a very high level and use standardised methods. This means we can guarantee neutrality and continuity in all our services to you.

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