The first thing that comes to mind is ENTSO-E's Power Flow Tool. It had a number of simulations of Europe's power grid with typical demand scenario's, prompting

The first thing that comes to mind is ENTSO-E's Power Flow Tool. It had a number of simulations of Europe's power grid with typical demand scenario's, prompting you to take care of grid balancing when a power line suddenly failed during peak load. Unfortunately I just discovered that they removed it from their website somewhere this year. I've asked them to restore it. For now you can play with this copy in the Internet Archive: https://web.archive.org/web/20220124003709/https://www.entsoe.eu/data/powerflow-tool/ https://web.archive.org/web/20220124003709/https://www.entso...