Electricity use is a reference for measuring industrial/ manufacturing activity.
http://www.reuters.com/article/2015/03/26/china-coal-idUSL3N0WL32720150326
http://wolfstreet.com/2015/07/23/china-electricity-consumption-growth-drops-to-30-year-low/
Har. I read once that China uses five times the energy of the United States per equivalent unit of industrial output.