This Sankey diagram is from a presentation by a student team of University of Maryland. They participated in a Hydrogen Student Design Contest in 2011/2012 sponsored by the Department of Energy
The Sankey diagram is for a combined heat, hydrogen, and power (CHHP) system for the UoMD campus.
Flows don’t depict absolute values, but rather how the fuel input (municipal solid waste, organic waste, natural gas) is split into energy outputs (electricity, hydrogen, and steam). Losses (52.4%) at each process stage are shown as red arrows.