It's a poor chart to evaluate costs, they should have just left off the gray and just made the point of labor and energy.
The remaining costs could be all costs (fixed and variable) or they could just be fixed.
If it is representing fixed costs only, it would be real estate, property taxes, heat etc. Things that don't change in amount with factory output changes
If it is representing both fixed and variable, it would be all the prior costs, PLUS, income taxes, raw materials, trucking, etc, basically anything that goes up with more production and profit but not labor or energy (because the author of the graph separated it in this case)
Basically it is a newspaper graph to make a point not really a data/informing graph.
I will say it is NOT only fracking. True the US is reducing our energy costs and even shifting to being an net energy exporter (make more than we use) but China uses so much, and currently has so little that it's costs comes from importing. So as ours goes down, theirs continues to go up.
As you watch the news about the South China Sea and Chinese expansion toward Philippines, Vietnam, Malaysia, etc. and the Senkaku Islands in the East China Sea (Taiwan and Japan) realize those two areas under the ocean are assessed to have more oil than Iran
You can see that current arguments about defense, shipping and fishing rights, and historical interest are really a veil for Chinese need to for oil, in a worse way than the US by far.