General Ideas For parallelism with the language of finance, net energy should refer to energy produced minus energy invested, whereas EROI should refer to energy produced divided by energy invested…. The relationship between ROI and EROI is actually very simple and logical. The more energy you have to invest to produce a fuel, the lower your EROI will be. The energy you invest has a cost. Therefore, the profit on the same barrel of oil will be higher when it’s produced from a high EROI source than when produced from a low EROI source. [1] The optimists believe that our energy problems have been largely solved. I wouldn’t bet on that. The real issue with oil isn’t how much we have or even whether we can continue to increase production. That’s what peak oil had come to represent and why, in retrospect, it was a misleading term. Rather, what […]