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DIN standards committee NAGUS on energy performance according to ISO 50001:2018

The DIN standards committee NAGUS comments on the determination and presentation of the improvement of energy-related performance according to ISO 50001:2018

Determination and presentation of the improvement of their energy-related performance according to ISO 50001:2018

Even though the adopted regulations in the energy management standard ISO 50001:2018 are of course clear and binding worldwide, the DIN interpretation of the presentation of the improvement of energy-related performance according to ISO 50001:2018 is of particular importance for German organizations. After all, the BAFA is very much based on the experience of many of our customers in approving electricity price privileges, such as the EEG BesAR, which very much follows these definitions. In the following you will therefore find the second version of this statement, which is available here in the original.

Answers of the working committee NA 172-00-09 AA “Energy efficiency and energy management” (in the DIN standards committee Fundamentals of environmental protection) to questions in connection with the improvement of the energy-related performance according to DIN EN ISO 50001:2018-12

preliminary remarks

The improvement of energy-related performance is a central objective of energy management systems according to ISO 50001:2018, which requires proof of continuous improvement of energy-related performance. According to the standard, this can be provided by means of energy performance indicators (EnPIs), in which the initial value (EnB, en: energy baseline) and the current EnPI value are determined, normalized if necessary, compared and summarized for all EnPIs at regular intervals. The following are questions from company practice which were submitted to the German standards committee and answered by it with regard to the proof or presentation of the improvement.

1. what makes a key figure an EnPI (methodology, influencing factors, normalization) ?

All indicators that show the actual energy-related performance are EnPIs. If the actual performance is not recognizable, e.g. in the case of purely financial indicators or because distorting, significant influencing factors (weather, capacity utilization, etc.) are not taken into account, we are not dealing with an EnPI. Indicators that take the relevant variables into account and can thus be normalized are EnPIs also in the sense of ISO 50006. If there are no significant factors influencing energy consumption (and thus no normalization is required), absolute energy consumption can also function as an EnPI.

Cf. DIN EN ISO 50001:2018-12, 3.4.4:

” Energy performance indicator (EnPI)Measure or unit of energy-related performance (3.4.3), as defined by the organization (3.1.1)

Note 1 on the term:

Depending on the type of activities being measured, EnPIs can be expressed by a simple metric, ratio or model”.

Cf. DIN EN ISO 50001:2018-12, 6.4:

“The organization must determine EnPIs that

(a) are suitable for measuring and monitoring their energy-related performance

(b) enable the organisation to demonstrate an improvement in energy-related performance. […]“

2. is a single EnPI?

Excluding the borderline case of a company with only one energy source and a significant energy use (SEU, en: significant energy use), several EnPIs are necessary for the operation of an energy management system (EnMS) and for the presentation of the improvement of energy-related performance.

Comp. DIN EN ISO 50001:2018-12, 6.3:

“The organization must: […]

c) for each SEU

1) determine the relevant variables;

Translated with www.DeepL.com/Translator (free version)