From a presentation on energy management held by Thomas Keller of Ecowin (available at the KNUT Hessen website) comes the following Sankey diagram.

The diagram is in German, but I get the main point: Energy and heat consumption in a company in MJ per hour. Fuels are natural gas (black streams) and electricity (red streams). The white boxes are the processes consuming the energy. Grey flows are transformed energy or losses.
Data seems to come from a energy management software with measuring devices installed along the production line. The company is about to obtain ISO 50001 certification.

I have recently noticed an increased use of Sankey diagrams in ISO 50001 case studies. Hope to see more of them coming.

This simple energy consumption diagram shows a breakdown of electric energy in a company. It is shown – along with a second Sankey diagram – on the website of German consulting firm RQH consult.

Flows are in MWh electric energy. The largest chunk of the 9,100 MWh (per year?) is consumed by ‘Spritzguss inkl. WP und Brunnenpumpe’ (Google translate: ”Injection including WP and well pump”)

Even before the 2011 release of the ISO 50001 energy management standard, which lists Sankey diagrams as one tool for energy analysis, companies and consultants have been using them in energy efficiency and energy management projects. Many published examples come from Austria, like this one.

Below is a Sankey diagram example for Austrian company ‘Joh. Pengg AG’ from a 2005 report published by Austrian Federal Ministry for Traffic, Innvation and Technology (bmvt): (H. Bayer: ‘Abwärmenutzung und Einsatz Erneuerbarer Energieträger in einem metallverarbeitenden Betrieb’, Report in German, Sankey diagram on p. 34).

All flows in kWh, total energy consumption for the year 2003 is 45,35 Mio. kWh. The red flows are for electric energy, the yellow ones for energy from natural gas. The middle column has the different equipments that consume energy within the company. Useful energy quantities (“Genutzte Energie”) are shown in orange, while losses are outputs in pink that are visually “collected” and joined again in the last node. Not sure what the light blue part stands for.

In a presentation given by Jurgen Zettl at the EM2010 conference in Vienna, the author reports about the integrated energy management and reporting at Sandoz’ Kundl site.

Page 22 of the PowerPoint has the following Sankey diagram:

The pic isn’t very clear, and it is difficult to see any detail. The overall energy consumption of the Kundl site comes in from the left (962,5 GWh in 2009). It is broken down to electric energy, energy from fossil fuels and energy from biomass (Note: I was wondering about the latter, but this is explained on page 6 that this is “feed for fermentation, solvents, … “). The streams are further broken down by use area. At the right side the flows join again to visualize useful energy and energy losses.

Good to see that large industries are using Sankey diagrams as an important element of their integrated energy management…