The Action Cam captured patients being transported from the hospital by ambulance.
"We are transporting patients to nearby facilities. Individuals seeking to reunite with family members or loved ones should call our information line at (215) 463-2031," Jefferson Methodist Hospital said in a statement.
Crews from the city's Office of Emergency Management have been called in to assist.
There was no immediate word on how many patients were impacted or when power would be restored.
No injuries have been reported.