Before revision: 486x486px|Hybrid Sankey diagram of 2011 U.S. interconnected water and energy flows There is no formal definition for the water-energy nexus – the concept refers to the relationship between the water used for energy production,Spang, E. S., Moomaw, W. R., Gallagher, K. S., Kirshen, P. H., and Marks, D. H. (2014).
After revision: 486x486px|Hybrid Sankey diagram of 2011 U.S. interconnected water and energy flows The water-energy nexus is the relationship between the water used for energy production,Spang, E. S., Moomaw, W. R., Gallagher, K. S., Kirshen, P. H., and Marks, D. H. (2014).