World's biggest biological power-to-gas plantfeeds biomethane into Danish natural gas grid

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Renewable methane, produced by the world’s largest biological power-to-gas plant, was injected for the first time into the Danish natural gas grid on September 24, 2019 near Copenhagen, Denmark. Using Electrochaea’s patented power-to-gas technology, the energy in green electricity can be stored in the natural gas grid for later use. Microorganisms, called archaea, are the key to the technology; the archaea exclusively synthesize methane, the key component of natural gas, from carbon dioxide (CO2) and hydrogen. At the Danish plant, the archaea make methane by combining CO2 from a nearby wastewater treatment plant with hydrogen produced by an on-site electrolyzer, which uses electricity to split water into hydrogen and oxygen. With a power consumption of one megawatt, the plant has the capacity to inject up to 31 SCFM of biomethane (1200 m3 per day) into the natural gas grid at the same time preventing the release of 800 tons of CO2 per year. The gas produced contains more than 98% methane and less than 1% hydrogen and CO2, exceeding the requirements for gas grid injection in Denmark. This high gas quality also exceeds the injection criteria in other relevant markets, such as Germany and California. The plant was built and operated with the support of the joint BioCat project (www.biocatproject.com), funded by the Energy Technology Development and Demonstration Program (EUDP) of the Danish Energy Agency. The main goals of project are to develop an efficient and marketable solution for the storage of wind energy, which is needed to balance energy supply and demand in situations where variable renewable energy sources, such as wind power, are dominant. The interest in storage solutions for renewable energy is particularly high in Denmark. The country’s goal is to be independent of fossil fuels and to have 100% renewable energy for all uses including transportation by 2050. By 2030, Denmark wants to produce 70% less CO2 compared to 1990 emissions.

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