Question-and-Answer Resource for the Building Energy Modeling Community
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Project Stasio had one winning entry in 2018 that dealt with Sankey diagrams for EnergyPlus: https://projectstasio.com/2017-10-31-solar-roses-57ejy-5jsw2-enm8z-h87ej/
I found the code on Github (never used it myself): https://github.com/alyabdelalim/Sankey-Diagrams-Data-Visualization
There is also article "EEBHub Building 101 Sankey Diagram Energy Analysis" by Singer, S; Simon, A J, from 2013, that has Sankey diagrams for E+. Haven't read the article, but you can find the info https://energyplus.net/node/4576
