16 Nov '11, 9pm

2011 ASPO-USA Conference: Day 2

2011 ASPO-USA Conference: Day 2

Dave Murphy spoke next on Energy Return On Investment. By his calculations, EROI for oil has gone from 100 in the early days to 10 in current deep water wells. He emphasized that EROI by itself is cannot determine whether one source of energy is better than another: coal has an EROI of 80 while hydro has an EROI of 40. Is coal twice as "good" as hydro? Dave described how net energy to society starts declining dramatically around EROI=9 and how bio-fuels are well below this number. He believes we need to carefully separate the energy used for construction vs . energy used for O&M when evaluating resources. Solar and wind have high embodied energy compared with fossil fuel production facilities but lower O&M costs from an EROI point of view. Dave also talked about a new article in Energy Policy that looks at different energy resources in terms of "doubling time," which is th...

Full article: http://www.theoildrum.com/node/8606

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