Facebook's datacentre is operating: https://www.ramboll.com/projects/energy/meta-surplus-heat-to...

AtNorth's are under construction: https://www.atnorth.com/news/selected-group-will-utilize-sur... and https://www.atnorth.com/news/denmark-data-center-to-supply-h...

Microsoft's is operating: https://danskfjernvarme.dk/aktuelt/nyheder/2026/dataskyen-se... (I can't find an English source.)