Because of finite transmission capacity, the optimal place to put batteries is pretty complicated. Consumption varies over time, and there can be bottlenecks g

Because of finite transmission capacity, the optimal place to put batteries is pretty complicated. Consumption varies over time, and there can be bottlenecks getting power into an area, so you might want storage near consumption. Wind power is going to vary in how much it generates, so if there are bottlenecks getting power out of the area, you might want storage near generation. Plus, bottlenecks can move around. For example, if two power plants share the same line to send power to two cities.