I’m happy to see that Forbes contributor James Conca has taken on the central EROI issue — what John Morgan termed the The Catch-22 of Energy Storage. In today’s essay EROI — A Tool To Predict The Best Energy Mix Jim engages directly with the reality that affordable utility-scale storage does NOT make solar PV and biomass into big winners in the future low-carbon energy portfolio. Jim contributed an effective new chart that combines both the with-storage and without-storage EROI profiles. The dotted line at EROI = 7 represents an estimate of the minimum performance required to support a modern industrial society, as represented by the OECD countries.
I want to emphasize that not only is this paper a major conceptual contribution to the energy policy, it is also a model of transparency. Included in the supplementals of the Weißbach et al. paper – are the spreadsheets containing all the materials reference data, assumptions and the EROI and EMROI computations. This means that any motivated reader can audit every detail of the energy inputs, material requirements and computations.
If any reader objects to any of the assumptions they are free to amend the Weisbach spreadsheets to compute their own preferred EROI profiles.
An excellent example of the transparency benefit of the Weisbach spreadsheet contribution is Keith Pickering’s GETTING TO ZERO: Is renewable energy economically viable? Keith used the Weißach model to analyze the progressively improving EROI of nuclear fission.
With 100% centrifuge, nuclear will have an EROI of 106, EMROI of 166 according to Weißbach’s analysis.
Here’s an earlier 8/13/14 Seekerblog post on the Morgan and Weißach work.