That is why you vote for people that invest in a usable power grid which can store overproduced electricity in batteries (chemical, water storage lakes with pumps, pulling weight up/down etc.),

Yup, which I’ve been doing for the last two decades and keep on doing, even though financially right-wing would serve my interests better.

Or just make electricity prices variable so that you can expect a ROI investing in your own battery (like charge your battery cheap or by solar and discharge it for bigger returns by night/bad weather)

We have variable pricing available here, the problem there is that having ADHD I need structure in my day and week. Guess I lack the courage, but having to plan chores around when prices are expected to be low sounds like a complete disaster scenario for me.