> fuel cells are generally between 40–60% energy efficient Which is reduced to 25% grid-to-motor efficiency when electrolysis and compression (required for pra

> fuel cells are generally between 40–60% energy efficient Which is reduced to 25% grid-to-motor efficiency when electrolysis and compression (required for practical energy densities) are taken into account. As illustrated in the linked graphic. Electrolysis is assumed since other methods (e.g., methane reformation) generally generate greenhouse gases, but there has been some work on algae bioreactors [1] that might become economically interesting. [1] https://en.wikipedia.org/wiki/Biological_hydrogen_production_(Algae) https://en.wikipedia.org/wiki/Biological_hydrogen_production...