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Definitions of Hydrogen
Here's a side-by-side comparison of important regulatory definitions of Hydrogen:
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The EU's Renewable and Low Carbon Hydrogen definitions
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The USA's Clean Hydrogen Standard, relevant to IRA
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The UK's Low Carbon Hydrogen Standard (LCHS)
We have explored each of these regulatory definition of Hydrogen in greater detail here
Key principles

Supported feedstock

Calculating GHG

Hydrogen definitions in depth
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