Abu Dhabi now boasts the world’s largest storage battery — a 108 MW/648 MWh behemoth that is five times larger than the Hornsdale battery installed in Australia by Tesla a year ago. There is one other important difference between the battery in Australia and the one in Abu Dhabi. The Tesla unit used lithium-ion battery cells. The one in Abu Dhabi uses sodium sulfur battery cells. Sodium sulfur technology was first explored by Ford as a possible source for electric trucks in t