About 4% of world H2 production is made as a byproduct of chlor-alkali manufacture, which is electrolysis but NOT with the intention of making hydrogen, reads a Linkedin post.
Since about 1/3 of electricity on earth is derived from renewables or nuclear, it is fair in my view to say that 1/3 of 4%, i.e. 1.3%, is “green”-ish. But most of that byproduct hydrogen is not part of the hydrogen market- most of it doesn’t make its way out of the chlor-alkali plants. It is mostly used either to make HCl or it is burned for energy in the chlor-alkali plants.
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