The second reason for grid storage is the increasing use of renewable energy sources like wind and solar which are intermittent and not on - demand. (theness.com)
As a bonus, the system would lead to more use of renewable energy sources like the wind and sun. (scientificamerican.com)
Batteries at this scale allow us to make best use of all renewable energy sources by harnessing the energy and having it ready for use whenever it's needed — increasing the share of renewable energy on the grid while at the same time providing a secure supply for our customers.» (energy-storage.news)