Elie
Created page with "'''EROI''' stands for "'''energy return on investment'''". {{minor|Even in a world without money, EROI would still matter just as much.}} Definition: <code>EROI = energy_returned / energy_invested</code> ==For energy sources== EROI is an essential factor in determining whether an energy source is viable or not. The EROI has to be a lot greater than '''1''' (otherwise it would never "break even"). ==For energy storage== The EROI of any energy storage will always be '..."