One of the main challenges of running a power grid is that supply and demand have to be in balance at all times. This means that electricity has to be consumed when it is generated. This makes it harder to integrate sources of energy over which you don’t have control, such as wind and solar power. What if there’s a high demand for electricity but the wind isn’t blowing and the sun isn’t shining? What if it’s a sunny and windy day and supply far exceeds demand?
That’s the problem that having more energy storage connected to the power grid could solve.
