Energy Pareto Info-graphic

This entry discusses a data graphing experiment.  If you want to learn about global energy use, the other entry is a much better place to start! Think of this chart as an executive summary. Supporting information is in the other entry.

A Pareto Analysis is usually done with a series of bar graphs, always choosing the biggest bar, or largest contributing category. By working through a sequence of graphs, people find the category that provides the greatest traction on improvement (on a percent improvement basis).

Sometimes focus areas are highly refined.  People have been working on improving them a long time so it is difficult to obtain a percentage of improvement.

Back to the graph.  The sequence of bar graphs method sometimes loses context on the original goal. This stacked column graph replaces an entire bar graph with a single column. We also bring the determined largest traction category back across as the foundation of every stacked column in the analysis. It is there for a context comparison every step of the way.

The graph shown below is an area graph.  It is kind of like a pie chart and a donut chart combined. Some will recognize it as a Venn diagram with more detail than is normally presented. The energy used is represented by the area covered by any given color. The largest consumer of energy is drawn as a circle in the middle of a donut displaying the less prominent consumers. 

This method lets one recursively apply the method until the final action based information is presented as a pie chart. People can process the action implications of a pie chart a little bit faster. Also, the dimensional discipline changes a little bit inside the pie chart.  The size (area) of the pie is correct: It represents the energy used by light vehicles on workday commutes. But inside the pie we don't know how many ride together in the carpools, or how long their commutes are. We do know that 88% drive alone, and if all drove in pairs, or many in triples, we could use approximatey half as much energy for workday commutes.

The savings obtained by reducing the area of the "Drove Alone" category by half are clear. Traveling with more in each car on the way to, and from, work will make a real difference, even when viewed in context of the U.S. energy consumption of all sectors - that would be the large yellow circle that represents 71.3 Quads. 

This radial area graph can be misinterpreted. Please treat as an experimental footnote.

Feedback on the combination graph indicated that people do not always weigh area properly and might use radius, or diameter,  as a proxy for area.  This would be a mistake by the reader, but as the publisher there is some accountability for proper interpretations. Please use the column graph. It is less prone to mistakes.  

The radial area graph can be misinterpreted. Please treat as an experimental footnote. 

Details and Data for Energy Pareto Analysis

Energy Use Pareto

Sometimes I expect that longstanding discrepancies in per capita energy use are common knowledge. 

Here is a Pareto, or drill down, analysis of energy use. The idea is to choose the largest contributing factor at each stage. If the exact numbers are difficult to read, that is not important. Just choose the largest contributor, or in this case consumer.

This chart shows per capita energy use by global region (source http://ourfiniteworld.com/2012/03/12/world-energy-consumption-since-1820-in-charts/):

Conclusion: An average person in the USA uses twice as much energy as an average person in any other region of the world. 

How is that energy used?

This chart shows how energy is used in the USA. Don't worry about the units. We are only looking for the largest use sector. We will choose the biggest one. (This diagram is worth a double click for more detail.) 

Transportation is the leading energy use sector in the USA today. 

How is that energy used?

Most is by light vehicles. That means cars and trucks. 

Let see what people do with cars and trucks.  How are they used? Most of the miles are for people going to and from work. 

We need to confirm a bit, as the title on the previous chart does not say cars. It says household travel. Here is some confirming data that says we are improving in the right place:

The traction point for improving energy use in the US, without altering home lifestyle by moving families into apartments, is: make the green carpool part of this graph larger. The graph is from the same data source, http://cta.ornl.gov/data/tedb31/Edition31_Full_Doc.pdf , but presented by the the CSS at the University of Michigan.

Here from the source document: