Spain Siemens Gamesa tests redox flow battery Siemens Gamesa is testing a redox flow energy storage system at the company’s La Plana research and development site near Zaragoza, Spain. | E-Buses to Surge as Conventional Vehicles Fade The electrification of road transport will move into top gear in the second half of the 2020s, thanks to tumbling battery costs and larger-scale manufacturing, with sales of electric cars racing to 28 percent, and those of electric buses to 84 percent, of their respective global markets by 2030. |