3 A B C D E F G H I J K L M N O P Q R S T U V W Y

Energy returned on energy invested

Energy returned on energy invested (EROEI) is used in energy provider industries as a guide to the viability and profitability of a resource. In oil well development, EROEI is the energy the well will produce as end fuel, expressed as a multiple of the energy required to extract and process it.