An in-depth piece in Nature this week focuses on innovation in China in renewable energy, in particular the development of a transmission bridge from West and North China to its industrial heartlands, and fresh developments in energy storage. Interestingly both of these features are well understood – China is spending a lot of money upgrading its transmission infrastructure, so that renewables can come from their sources in West and Northern China, to Beijing and Shanghai – and a long standing key experiment in energy storage is based not on lithium ion technology, but on Vanadium Flow and will go live this year. But it caught our eye for the graph below, which shows something that should surprise most European and…