100% renewable targets will require power storage to manage flows on the net
Electrolysers utilise these intermittent power flows to produce H2 gas from water
H2 gas can be stored in large quantities underground and transported via existing gas pipelines
H2 vehicles recharge faster and are more durable than battery powered transport
Growing H2 demand in industrial processes will reduce costs and increase supply

The municipal utility of Mainz together with Linde, Siemens, and a local university established the largest facility in the world that generates hydrogen from renewable electricity. With 17 million euros in research funding, the new facility has just gone into operation (report in German). It takes excess electricity, partly from nearby wind turbines, to produce hydrogen by means of electrolysis. The system can convert up to six megawatts of electricity at a time. Apparently, there is no specific storage limit; trucks supply nearby hydrogen stations with green hydrogen from a local hydrogen storage facility enough to power “2,000 fuel cell cars.”

photo: Mainz Microtron,

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