University Hospital Wishaw has experienced problems with the electrical power and is urging patients "not to go to A&E" but instead travel elsewhere.
A statement posted on Monica Lennon MSP's Twitter from the hospital says: "University Hospital Wishaw has experienced interruptions with electrical power today.
"This is due to a fault with the electrical transformer unit.
"The hospital is being powered by back-up generators until normal power is restored".
Hospital staff warned patients at A&E may be redirected to another service or face a "length wait".
Those with urgent criteria will be seen first.
Some specialist urgent procedures patients may be directed to facilities in neighbouring health boards.
