Eurostar is advising passengers scheduled to travel today to change to another date due to power issues in the Channel Tunnel.
They suggest travelers not go to the stations as well.
https://www.bbc.com/news/live/c93wkw37p0pt
Update 3:25 CET: Trains have partially begun to run again but Eurostar still advises passengers to postpone travel. Those who do travel today can expect "Severe delays and possible last minute cancellations."
Happy New Year.