@kirschwipfel Back to the solar/wind: they are absolutely fantastic but they have two disadvantages.

First, they are intermittent - they don't always produce energy when we need it, and sometimes they produce too much when we don't. They need storage or intelligent grid.

Second, solar/wind have small energy density - you need to occupy 70 km2 for a 400 MW wind farm and it will only work at 40% on average, so you need 2x that really.