> but no one in anywhere near the ability to store energy for a whole country for weeks in cold countries, when days are very short and wind can just decide to

> but no one in anywhere near the ability to store energy for a whole country for weeks in cold countries, when days are very short and wind can just decide to stop blowing Sure they do, the storage is just called hydroelectricity. There are parts of the world (eg Tasmania) with months of energy storage. For the realised cost of nuclear and construction timeframe of nuclear, you could build a resilient supply with a distributed transmission grid and a mix of batteries and pumped hydro.