AbstractThis paper outlines some very real issues with the use of energy return
on investment (EROI) for comparing different energy delivery pathways, particularly
when directly comparing EROI calculated at the scale of a single energy facility (as
a ratio of full lifetime energy transfers) with that calculated at the scale of a
geographical region or industry (as a ratio of annual energy flows). While these two
ratios may converge, it is only under a very specific set of circumstances. The aim
of this paper is to outline this issue in detail and provide some specific examples
of the difference between these two ratios for the global wind and photovoltaics
industries.
When is EROI Not EROI?