In the Gobi Desert in Golmud City, Haixi Mongolian and Tibetan Autonomous Prefecture in northwest China's Qinghai Province, giant white tanks stand out against the gravel plain. Inside the tanks, in an ultra-cold environment of minus 194 degrees Celsius,
Conversion efficiency will be a lot lower though. Not that it matters as for a system like this the cost per KWh is the most important metric.