Transmission lines and storage. There are multiple 2500km transmission lines in use today. They are relatively cheap to build and solve almost all the intermit

Transmission lines and storage. There are multiple 2500km transmission lines in use today. They are relatively cheap to build and solve almost all the intermitency issues. China has a few over 3000km long already, eg: https://spectrum.ieee.org/energywise/energy/the-smarter-grid/chinas-state-grid-corp-crushes-power-transmission-records https://spectrum.ieee.org/energywise/energy/the-smarter-grid... and there is a 4500km long line planned for Australia to Singapore: https://en.wikipedia.org/wiki/Australia%E2%80%93ASEAN_Power_Link https://en.wikipedia.org/wiki/Australia%E2%80%93ASEAN_Power_...