Steam is compressible and has different specific volumes. 1 kg of steam at 1800 kPa will occupy 110 liters while if pressure is reduced to 200 kPA the volume increases to 830 liters, which means it can displace 720 liters of water. This principle is used in the innovation. The submerged vessel in the tank gets filled with water by gravity and steam which is injected in the vessel pushes the water out because of expansion of steam. There are practically no moving parts in the system and hence it will be maintenance free.
Energy [R]evolution: A Watershed Moment in India