Yeah, sorry about that! Turns out the Elexon API I use for the generation data doesn't like being on the HN front page. Lesson learnt that I should add a proxy store between their API and the map.
No trouble and thanks for the prompt to go have a look at it again, really cool site!
Thanks!
The Elexon API is down again unfortunately. Lesson learnt that I should be storing this data myself in future to avoid it taking down the entire map.