Kongsberg Maritime has developed a ship engine room simulator that also features a Sankey diagram visualization.
The Sankey diagram is a simple bottom to top breakdown of the energy contained in the fuel input. Useful energy on the power train is shown as a vertical flow to the top, while losses branch out to the right. The display can be toggled between “MW” and percent.
This visualization is one of the “approach[es] Kongsberg Maritime has towards enabling the Green Ship”.