Today, Abu Dhabi is home to the world's largest'virtual battery plant'. The 108 MW/648 MWh sodium-sulfur battery plant' opened in January 2019 and is about five tines the size of the Telsa battery system installed in Hornsdale, Australia in 2017. Sodium-sulfur batteries can perform better in higher temperatures (as high as 300 degree Celsius) making them a lot more robust and summer-ready. 

UAE's new battery system is so large in size that it could provide up to six hours of back-up power in case Abu Dhabi's electricity grid goes down. Due to such longer-duration storage, sodium-sulfur batteries become cheaper than lithium-ion batteries.