The Syrian government said a power cut hit Damascus and its suburbs overnight, and blamed the blackout on a rebel attack on the main power line feeding the capital.
Residents said electricity in the capital went out late on Sunday night and returned to limited areas in the morning.
Syria's state news agency quoted electricity minister Imad Khamis as saying that the outages were caused by "an armed terrorist attack on the main feed line". The regime refers to those fighting to topple president Bashar Assad as "terrorists".
Mr Khamis said authorities were working to restore power.
The rebels did not immediately comment on the power cut.