So general terms. As is often the case with the energy transition, regulation is once again becoming an issue in the biogas sector. Factories already make a small contribution to the gas supply. There are approximately 10,000 biogas plants in Germany, 230 of which are connected to the gas network and feed methane directly there. In principle, all German systems, plus a little gas, currently saving so much electricity and covering nearly nine percent of the country’s demand, could only do so by about one percentage point less than solar. But Roh says, “Financially, the direct feeding of biomethane is currently a very accurate calculation” for his company, which generates about 15 megawatts of electricity with biogas, up to four large wind turbines.
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The fact that at the moment direct gas generation is not worth it is mainly due to strict legal regulations. If methane is produced in biogas plants in order to feed it directly into the gas network, corn may be only 44 percent of the original mass, and the rest should consist of agricultural residues, such as liquid manure. This is to prevent a lot of farmland being blocked off for energy use only. “The bases of the substrate mixture have to be changed, so gas production can also become more attractive,” says Roh.
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