In our electrical system, it is required that the electricity we produce is also consumed at the same rate to maintain the proper balance, which is measured in hertz. The frequency value in the electrical system should be 50 hertz, with a small margin. By smartly managing the charging and discharging of batteries, for example, we can quickly ensure that this balance is maintained. If you want to know more, you can watch this video from Svenska Kraftnät:

https://www.youtube.com/watch?v=W2OzGaltu3Y