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Energy Saving Ordinance 2009

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The Energy Saving Ordinance ("Energieeinsparverordnung (EnEV)") is an important part of the energy- and climate politic of the German Government. It primarily poses requirements to the primary energy demand of new buildings. For existing buildings requirements are posed above all in the case of energy relevant alterations (refurbishment, extension), in certain cases also requirements to retrofit.

In the calculations according to the EnEV, the thermal insulation of the building envelope as well as the energy efficiency of the technical building systems used (heating system, ventilation, cooling, light) are taken into account. By means of a multiplier, the primary energy factor, the upstream processes of the utilised energy carrier (from source to the buildings’s boundary) is assessed, so that the differing usage of resources and indirectly also the differing CO2-Emissions are taken into account.

As part of the "Integrierte Energie- und Klimaprogramm (IEKP)" of the government, the EnEV was revised in 2009. The Energy Saving Ordinance 2009 came into effect on 1 October 2009. An essential element of the EnEV 2009 was the strengthening of the requirements by about 30 % in relation to the status of 2007.

In 2009, the ordinance was enacted as an amending regulation:

The state of regulations as of 1 October results from the EnEV 2007 and the amending regulation. Recently, 2 additional regulations with influence on the effective wording of the EnEV got into force:

Because of these changes, two different wordings of the EnEV are valid in differnt timeframes, given in the following unofficial "Reading Versions" (only available in German):

For practical implementation of the ordinance, additional regulations are brought to the attention:

In course of the issuing of the EnEV 2009, the Federal Institute for Research on Building, Urban Affairs and Spatial Development has commissioned and evaluated several accompanying studies.

more about accompanying studies

In accordance with the constitution, the federal states are responsible for the legal enforcement of the legislation on energy saving. In the course of the implementation of legal energy saving ordinances, some questions arise especially in the beginning. They are not always clearly answerable from the legal text alone or from standards referred to by the ordinance and allow various interpretations.
To allow in this context an implementation of the Energy Saving Ordinance as consistent as possible, the Expert Commission on Construction Technique ("Fachkommission Bautechnik") of the Conference of Ministers of Construction and Housing ("Bauministerkonferenz") decided to install a working group. This working group shall answer incoming questions of common interest. The draft answers of the working group are discussed and finally released by the Expert Commission.

• Interpretations to the Energy Saving Ordinance 2009 (only available in German)

Additional requirements to new buildings result from the Renewable Energies Heat Act (Erneuerbare-Energien-Wärmegesetz - EEWärmeG) from January 2009;

more about the Renewable Energies Heat Act

From 1st May 2014, the valid version of the EnEV is the EnEV 2013. The EnEV 2009 – generally valid to 30th April 2014 – may further be applied in some cases of new buildings for which the application for building permit was submitted earlier.

more about the EnEV 2013

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