TECHNOLOGY FOCUS - BIOLOGY - Preferred Process: The microorganism of the species Paenibacillus macerans is added in the form of a culture of microorganisms, where the microorganism of the species Paenibacillus macerans represents at least 10-4% of the total number of microorganisms present in the culture. A pure culture or immobilized culture of the microorganism of the species Paenibacillus macerans is added. The microorganism of the species Paenibacillus macerans is added to the biomass as component of at least an immobilized culture of microorganisms. Additional biomass is added to the fermentation reactor contemporary for the addition of the microorganism of the species Paenibacillus macerans. The production of biogas from biomass is carried out at a loading rate of greater than or equal to 0.5 kgoTS/m3d, preferably greater than or equal to 6 kgoTS/m3d. The addition of substrate and the addition of the microorganism of the species Paenibacillus macerans are carried out continuously. The microorganism of the species Paenibacillus macerans is added in an amount to the fermentation substrate, which represents after the addition of the proportion of the microorganism of the species Paenibacillus macerans of 10-8% to 50%, preferably 10-3% to 1% to the total number of microorganisms present in the fermentation substrate. In the process, additionally microorganism of the species Clostridium sartagoformum, preferably microorganism of the strain Clostridium sartagoformum SBG1a, and Clostridium sporosphaeroides, preferably Clostridium sporosphaeroides SBG3, are added. Preferred Components: In the culture of microorganisms, the microorganism of the species Paenibacillus macerans represents at least 10%, preferably at least 90%, or at least 1%, preferably at least 90%, of the total number of microorganisms present in the culture. The loading rate in the fermentation reactor is continuously increased by continuous addition of biomass. The microorganism of the species Paenibacillus macerans is a microorganism of the strain Paenibacillus sp. H10-05. The sequence region has more than 98%, preferably more than 99.5% sequence identity with the nucleotide sequence of SEQ ID NO: 1. The sequence region corresponds to the nucleotide sequence of SEQ ID NO: 1.