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- most likely, electrical input energy divided by fuel output energy, neglecting capital costs and ongoing operational costs, especially filter quality, all of which has its own additional energy footprint, in order to obtain a portable, liquid fuel with typically at most 60% efficiency in harvesting mechanical energy back again , so really useful only if the renewables are far, far away from the desired application point yet you have advanced human and technical infrastructure nearby to run this exotic thing (en)
- less intensive as compared to what, exactly? (en)
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