Current natural gas infrastructures transmit and distribute mainly fossil and partly regenerative gases. In Germany the injection of regenerative gases in gas pipelines is regulated and supported by the law on the energy industry (EnWG). In particular, fermentative biogases and hydrogen generated by power to gas plants are highlighted. Moreover, synthetic natural gas (SNG) as a reaction product of hydrogen and carbon dioxide is enclosed. In contrast to SNG, hydrogen as admixture to natural gases can significantly modify gas qualities. In particular, the calorific value and density is lowered. There is a set of pilot plants in Germany used for operation of almost carbon free gas generation technologies and injection stations. Regenerative gases are distributed and traded in the exact same manner as fossil gases. Since all gases are commodities, the related energy needs to be metered. In Germany metering of commodities is covered by the weights and measure act. Therefore, devices used for metering need approval and calibration at registered test rigs. In this presentation the metering technology of regenerative gases and carbon dioxide used in power to gas facilities is presented. Metering stations and metering sections in injection stations described. Moreover, metering results and meter accuracy curves of calibrations are shown. It is concluded that generally accepted gas meters of the gas industry can also be deployed for fiscal and custody transfer metering of regenerative hydrogen, carbon dioxide, SNG, biogas and hydrogen enriched natural gases.
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