Only very rarely does our energy demand exactly match the supply, so energy storage of some sort is required. In remote locations, batteries are the only practical answer, but batteries are expensive to buy and hazardous to work with.

In urban areas, where there is already a well-developed national grid for electricity supply, it will make better sense in most cases to use the grid as an enormous ‘battery’, exporting power when there is a local surplus and importing power from elsewhere when you need it.