Conclusions
Burning hydrogen is very inefficient compared with the alternative of using a heat pump.
Hydrogen is wasteful of renewable electricity and/or would substantially increase the amount of natural gas used in the UK.
Emissions from burning blue or green hydrogen are significantly higher than those of heat pumps.
It is unlikely the infrastructure for a blue or green hydrogen economy could be built by 2040.
Hydrogen is a fundamentally poor choice for heating buildings and should not be on the policy agenda. Heat pumps and energy efficiency should be government policy instead.
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