The machines used in this season are both rented. The provider will take care of setting up UPS and generators to ensure that there is no downtime.
For machines running at home also, it is common to have an UPS to ensure uninterrupted power, the amount of backup power provided can be extended by external batteries connected to the UPS. In localities where power can go off for a long time, generators are used to provide power indefinitely.
However, none of these are a concern for TCEC as electricity is rarely interrupted in the locations it is run.
There is a chasm
of carbon and silicon
the software can't bridge