Where are you getting that 20% number from? https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2019/Sep/IRENA_Power-to-Hydrogen_Innovation_2019.pdf?p

Where are you getting that 20% number from? https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2019/Sep/IRENA_Power-to-Hydrogen_Innovation_2019.pdf?page=11 https://www.irena.org/-/media/Files/IRENA/Agency/Publication... https://www.sciencedirect.com/topics/engineering/round-trip-efficiency https://www.sciencedirect.com/topics/engineering/round-trip-... The round trip efficiency is 30% or more and rising with better electrolysis and reverse electrolysis being developed.