Non-dispatchable renewable energy supply from wind and solar photovoltaic power plants requires huge energy storage to cover the needs of a stable grid. Here we discuss the performance of the battery energy storage case study in Australia, which may only solve some short-term energy storage issues at considerable costs. Other energy storage technologies, from thermal to pumped hydro energy storage, and finally hydrogen energy storage, appear to be indispensable, same as the addition of dispatchable renewable energy supply, from concentrated solar power, geothermal or biomass, is extremely welcome even at larger Levelized cost of electricity.