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I'm assuming currently proven tech of batteries. And we need to act now for climate change, with current tech. Electricity to H2 to electricity has horrendous

I'm assuming currently proven tech of batteries. And we need to act now for climate change, with current tech. Electricity to H2 to electricity has horrendous efficiency (about 20% at most IIRC). We'd be much better off CO2-speaking using it to replace coal in steel production, and replace gas in fertilizer production. Both of which are proven tech (but not globally deployed, as coal and gas are cheap)

pfdietz 4y ago
Power2Gas2Power has low round trip efficiency (say 40%), but as only a fairly small fraction of the energy flow goes through it that doesn't matter that much at the end of the day. If it did, that just means heavy industries would migrate to less seasonally variable places.
ncmncm 4y ago
Inefficiency just requires extra capex, not opex. And the capex is capex is still falling at an exponential rate. So, no.
Sinidir 4y ago
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.