When I worked with medium-sized scale batteries one of the most surprising use-cases was to use them _together_ with diesel generators. Diesel generators are incredibly wasteful because they don't vary the power output / fuel-consumption very well based on demand.
When you couple a large battery with a diesel generator the generator turns off when the battery is full so the generator always run at optimal efficiency.
When you couple a large battery with a diesel generator the generator turns off when the battery is full so the generator always run at optimal efficiency.