Energy Returned on Energy Invested

What is Energy Returned on Energy Invested(ERoEI)?

ERoEI= Energy returned to society___________________________Energy required to gain that energy

It indicates whether a fuel is a net energy gainer or loser.

What is the significance of ERoEI?An ERoEI of 1.1:1 would mean

The energy gained would be equal to extracting the oil from well and looking at it

What is the significance of ERoEI?An ERoEI of 5:1 would mean

The energy gained would be equal to extracting the oil from well and transporting it

What is the significance of ERoEI?An ERoEI of 15:1 and above would mean

The energy gained would be equal to extracting the oil from well and transporting it and burning it

ERoEI for oil productionIt simply reflects the barrels of oil extracted

by spending one barrel of oil.

ERoEI for oil production in US over the years

ReferencesEnergy Return on Investment, Charles AS Hall, Carbon

InstituteGuilford, Hall, Connor, Cleveland "A New Long Term

Assessment of Energy Return on Investment (EROI) for U.S. Oil and Gas Discovery and Production.”

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