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Hydrogen Energy Conversion Efficiency is About 31% - Does it Make Sense?

Dr. Amal Khashab's picture
Expert Independent Consultant ,Electric Power Systems Engineering Free lancer

Summary Full Academic Qualification by obtaining B.Sc. (1971), M.Sc. (1980) and Ph.D. (1991) of Electric Power Engineering. Active continuous education by participating in long periods of...

  • Member since 2019
  • 510 items added with 69,108 views
  • Oct 19, 2021


- To produce 1Kg. of Hydrogen by electrolysis, it consumes 48.8 kWh of Renewable electricity.

- This 1Kg. of Hydrogen produces just 15 kWh.

- This means Hydrogen energy conversion efficiency is 31%

- Does it make sense?

Bob Meinetz's picture
Bob Meinetz on Oct 19, 2021

"This 1Kg. of Hydrogen produces just 15.5 kWh."

Dr. Amal, ΔG of O + H2 → H2O is 118 MJ/kg = 32.78 kWh.  How are you arriving at your figure?

Dr. Amal Khashab's picture
Dr. Amal Khashab on Oct 20, 2021

Hi Bob

It is energy-wise.

1Kg of hydrogen is equal to 1 gallon of gasoline. In turn, 1 gallon of gasoline produces 15KWh.

Roger Arnold's picture
Roger Arnold on Oct 20, 2021

Many will quibble about that 31% conversion efficiency. A more widely accepted figure is currently 40%, while proponents hold out for the feasibility of 50% in the future. Regardless of that, I think the answer to your question has to be "no, it doesn't make sense". Not if there are other, more economically efficient solutions for long term energy storage.

The problem is that at present, no more economically efficient solutions are recognized. They likely do exist, and people are working on them. But there are a lot of complex tradeoffs, and nobody really knows where the ball is going to drop.

Dr. Amal Khashab's picture
Dr. Amal Khashab on Oct 26, 2021

Hi Roger

Thank s for your answer. Yes, there are a lot of complex tradeoffs, but I am quite sure that the logical choices must dominate. Let us wait and see.


Dr. Amal Khashab's picture
Thank Dr. Amal for the Post!
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