A really good view onto Great Britain's electricity grid is here: https://grid.iamkate.com/ https://grid.iamkate.com/ or alternatively a more old school view,

A really good view onto Great Britain's electricity grid is here: https://grid.iamkate.com/ https://grid.iamkate.com/ or alternatively a more old school view, with analog dials!: https://www.gridwatch.templar.co.uk/ https://www.gridwatch.templar.co.uk/ Today for example renewables have been >50% of total generation. And I've seen sometimes for as long as a week it's not broken 10-15%. Very interested as to how the grid maintains excess capacity to make up for low wind generation...