Tenaga Nasional Bhd (TNB) has apologised to millions of consumers after an electricity outage that hit several parts of the Klang Valley and other towns today.
In a statement, it said the disruptions began shortly after 12.30pm and involved 2.2GW – approximately 10% of total supply demand.
The affected areas included Petaling Jaya, Cheras, Bangi, Bayan Lepas, Seberang Jaya, Panchor and Bandar Indera Mahkota.
TNB said supply was fully restored in the majority of areas within 20 to 40 minutes.
"We are looking into the cause of the incident and efforts are underway to restore electricity supply," it added.
This follows complaints of power cuts in parts of Petaling Jaya, Shah Alam, Ampang and Kuala Lumpur.
Blackouts were also reported in Kuantan, Pahang and Seremban in Negeri Sembilan.
Malaysia last experienced a major power outage in 2005, when large parts of the country were left in total blackout following a fault in the main cable transmission line grid in Selangor.
The Kuala Lumpur City Hall (DBKL) meanwhile said that traffic lights around the capital city had been disrupted, and asked road users to exercise caution to prevent accidents from occurring.
It said DBKL traffic wardens had been instructed to monitor and control the traffic flow at major roads.