> Batteries aren't the only storage. The better options in my opinion are the places where you can use the landscape to your advantage. Pump a lake full when there's too much power and let it drain when there's too little.

It's also the oldest storage tech and I doubt there's a single place in Europe available to build more.

> Also in a connected grid setup, the sun always shines somewhere though that does come with potentially huge transmission losses from distance

The whole EU is in winter weather together.