Since 2009, all market participants in biofuel production must prepare greenhouse gas calculations to demonstrate that they are achieving a savings target. The basic legal principles behind this are as follows:

  • The European Renewable Energy Directive (EE-RL, 2009/28/EC)
  • The Fuel Quality Directive (2009/30/EC)
  • German sustainability legislation (Biokraft-NachV, BioSt-NachV).

When the economic players came to implement the greenhouse gas calculation, they required a substantial amount of information and more specific details. With this in mind, the aim of the BioNachTHG I  was to plug any gaps in terms of definitions and data, and to provide more specific details of the calculation method for a practical application. This resulted in the development of user-friendly Excel-based calculation tools: ENZO2 (emission calculation for sustainability certification of CO2 equivalents).

In March 2013, these were recognised by the German Federal Agency for Agriculture and Food (BLE) in accordance with Biokraft-/BioSt-NachV §8(3)2b. This means that they can now be used by all recognised certification systems for the calculation of greenhouse gas emissions in accordance with German law.

The follow-up project BioNachTHG II involved updating the calculation tools to reflect new developments at EU level. Some aspects of the methodology which had not been substantiated sufficiently in earlier regulations were also further developed.

In future, the calculation tools will be updated in accordance with the updates of the EE-RL and new requirements on the part of the Commission. This includes updating the existing values, methods and, where necessary, extending the tool to include additional bio-energy sources.

The calculation tools are harmonised with the GHG calculations at EU level, as implemented in the BioGrace project.


November 2009 – December 2015


Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety

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