There is no need to "find" cheap energy storage. Many different methods are already known to store energy. But building storage before you have enough renewabl

There is no need to "find" cheap energy storage. Many different methods are already known to store energy. But building storage before you have enough renewables to charge it from would be stupid. So, the money goes to generating capacity, in the meantime. When storage is needed, it will be much cheaper than today, as cost is falling even faster than generating capacity.