Flooding causes Bristol Royal Infirmary power problem
Flooding has left parts of the Bristol Royal Infirmary (BRI) relying on a back-up power supply.
Patients in the Queen's Building, one of three main buildings at the hospital, have not been moved.
But the hospital said it had cancelled all non-emergency operations on Tuesday at the BRI and the Bristol Heart Institute because of the problems.
A spokesman said the cold weather had caused a pipe to burst, causing the flooding.
The emergency department at the BRI was closed for a short time but had reopened by 2100 GMT.
The neighbouring Bristol Children's Hospital is open as normal.