Belleville General Hospital was working on generators over the weekend.
Quinte Health Care says the planned outage began Saturday morning at 5:00 a.m, lasting until late yesterday Sunday afternoon.
QHC spokesperson Catherine Walker says there was no impact to patients or their care.
It affected the Emergency Wing, the Lab, the WCA Wing and the Hastings Wing.
The outage was used for routine maintenance at the hospital.
Walker says they do work like this on an annual basis.