The influx of renewable energy to national power grids has hit something of a bottleneck. While technological innovation in energy storage has taken off, the current infrastructure is limited in the amount of energy that can be stockpiled from intermittent sources such as solar and wind power. The storage technology incorporates basic principles of physics that have been used in the production of pumped hydropower plants for years. In pumped hydro. Existing energy storage systemsare currently very costly. Take Tesla's 100MW/129MWh battery technology in Australia, for example, which cost the company. Indian energy provider Tata Power was one of the first firms to show interest in bringing the gravity storage system into commercial operation. In November 2018,.