The guidelines entitled "Suggestion for a documentation system for biogas characteristics" describe the legal background for the biogas register. It is maintained by the dena and constantly updated.
It provides detailed information on the relevant legal background for biogas in the natural gas grid. The criteria catalogue and the matrix of the German biogas register are derived from the guidelines.
The first version of the guidelines were developed as part of the Renewable Energy Sources Act (EEG) documentation project, which was funded by the Federal Environment Ministry (BMU).