EROI – Energy Return on Investment.

A Competitive Algae Biofuel EROI

One key measurement the study examined was Energy Return on Investment (EROI). Loosely speaking, EROI is a way of comparing the amount of energy needed to produce energy in various forms, including petroleum as well as biofuel, wind, solar and other renewable sources. In other words, it’s a way of getting a handle on how energy-efficient your energy production is.

EROI is not an absolute indicator of sustainability, but it does help to indicate where a particular source fits in with regional, national and global energy markets. In that context, a competitive EROI for algae biofuel provides support for a national energy policy that replaces petroleum.
Read more at http://cleantechnica.com/2013/09/21/new-study-shows-algae-biofuel-lifecycle-lowers-carbon-emissions/#phsqlQeKOPkz7xxt.99

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