I work on a team building a real-time display of energy flows (production and consumption) on a regional basis (by municipalities). This is mainly used in town halls on a flat-screen display but of course publicly accessible as well. It‘s made with VueJS but will be rewritten with Svelte very soon. Here‘s one example of one of over 140 municipalities at the time of this writing:
https://energiemonitor.bayernwerk.de/abensberg